Moo Phosphorylation Signal Ha e le hantle e fosahetse
Phosphorylation stoichiometry e tlase haholo. Ka nako efe kapa efe, karoloana feela ea letamo la protheine e reretsoeng e na le ketsahalo e itseng ea phosphorylation, 'me karoloana eo e bolokiloe ka matla ke mesebetsi e hanyetsanang ea kinase le phosphatase. Joalo ka a 2015 hlahloba ka Limolek'hule tsa BioSystems akaretsa, mathata a tobileng ho phosphoproteomics - low stoichiometry, phosphopeptide tahlehelo ho pholletsa le ho lokisetsa mehato e mengata, ho se sebetse hantle ha ionization, le sebaka se nepahetseng sa phosphosite - kaofela li kopanngoa ha mefuta ea pele ho tlhahlobo e sa laoloe.
Phosphatase ha e eme ha sampuli e kenngoa ka har'a tube. Mochesong oa tikoloho, enzymatic dephosphorylation e tsoela pele ka lysis, phokotso, esita le mehato ea pele ea ho senyeha ha protheine ntle le haeba ho nkoa mehato e tobileng ho e thibela. Bakeng sa tyrosine phosphorylation ka ho khetheha, phello e ngotsoe hantle libukeng tsa mantlha: ka litokisetso tse ikhethileng tsa T-cell membrane, ho tlosoa ha protheine-tyrosine-phosphatase inhibitor e bakileng Lck, Fyn, Syk, Zap70, le CD3ζ ho ba dephosphorylated ka potlako, le tyrosine phosphorylation ea β- le γ-catenin e ne e le e hlakotsoe ka botlalo ke kalafo ea phosphatase ha inhibitor e le sieo. A 2019 tlhahlobo ea mekhoa e hlokomela hore lets'oao le hlakileng la phosphopeptide le ka oela ntle le phosphatase inhibitor mme la phahama le lona, mme e khothaletsa ho tsamaisa lisampole ka le ntle le inhibitor ha ho lekoa tyrosine phosphorylation. Boholo ba tahlehelo bo itšetlehile ka maemo - bo fapana le protheine, lesela, mocheso, le ho lieha pele ho tima - kahoo ha ea lokela ho fokotsoa ho peresente e le 'ngoe ea bokahohle. Phello e sebetsang: haeba mohlala oa ho sebetsana le protocol ha o etselitsoe ho tšoara mosebetsi oa enzymatic ka potlako le ka ho feletseng, phosphoproteome eo u e lekanyang ha e bontše baeloji eo u neng u rerile ho ithuta eona kapa ntho e entsoeng ka mokhoa o ts'oanang - e bonts'a motsoako o sa lebelloang oa bobeli..
Mehloli ea pele ho tlhahlobo ea lihlopha tse fapaneng ka mekhahlelo e mehlano e laolehang: ho lokisa nako, taeo ea ketane e batang, sebopeho sa lysis buffer, phethahatso ya ho matlafatsa, le mekhoa ea mekhoa ea LC-MS. Ho laola mohato ka mong ka boikemelo, ebe oa li hlahloba e le tsamaiso, ke tlhaloso ea ts'ebetso ea ho tiea pele ho tlhahlobo ho phosphoproteomics.
Nako ea ho Lokisa le Cold Ischemia: Oache e qala nakong ea ho khutla
Bakeng sa phosphoproteomics e thehiloeng ho lisele, karohano lipakeng tsa resection le fixation - e bitsoang nako e batang ea ischemic - ke phetoho e le 'ngoe ea bohlokoa ka ho fetesisa ea pele ho tlhahlobo.. A 2013 Journal of Proteome Research boithuto e ile ea hlahloba lisele tsa sebete sa rat le mouse tse sebetsoang ka nako e fapaneng e batang ea ischemia mme ea etsa qeto ea hore tieho e telele e hlahisa "liphetoho tse sa tobang tsa phosphoproteome tse ke keng tsa boleloa esale pele kapa tsa abeloa liprotheine ka bomong." Sena ha se phello e fokolang libakeng tse 'maloa; ke kabo bocha ea lefats'e ea lets'oao la phosphorylation le phatlalalitsoeng mohatong o mong le o mong oa tlhahlobo e tlase.
Lenane la nako le hatella haholoanyane sebakeng sa sebaka. A 2014 Patlisiso ea laboratori boithuto quantifying phosphoepitope expression in FFPE e fumane hore lets'oao la phosphorylated epitope hangata le fokotseha ha nako ea ho lokisa e ntse e eketseha., e nang le li-epitopes tse bonts'ang tahlehelo e lekanyang ka hare 30 metsotso e batang ea ischemia. E latelang 2021 PMC ho ithuta ka ischemia e batang ea lisele tsa tumor e tiisitse taba, ho hlokomela hore thepa ea FFPE ka kakaretso ha e tšoanelehe bakeng sa liteko tsa kinase kapa tlhahlobo ea phosphostatus ha serame sa ischemia se sa laolehe..
Liqeto tse peli tse sebetsang li latela bopaking bona:
Khetho ea lintho tse bonahalang: Lithane tse ncha tse leqhoa li boloka botšepehi ba phosphoproteome ho feta FFPE bakeng sa ho sibolloa ha phosphoproteomics.. Phallo ea mosebetsi ea FFPE e ka sebetsa bakeng sa tlhahlobo e lebisitsoeng ea phosphoepitope ka li-antibodies tse netefalitsoeng kapa tlhahlobo e khethiloeng ea karabelo., empa feela ha bobeli ba protocol ea fixation le nako e batang ea ischemia e ngotsoe le ka har'a meeli e tiisitsoeng.
Tlhokahalo ea litokomane: Nako e batang ea ischemia e lokela ho tšoaroa e le tlhahlobo e tlamang ea liteko, eseng tlhaloso ea tsamaiso. Haeba e sa khone ho bapisa lihlopha tsa papiso, e tlameha ho etsoa mohlala oa moferefere ho fapana le ho hlokomolohuoa.
Noto ea boholo: Lingoliloeng tse batang-ischemia tse kaholimo li nkiloe haholo-holo ho tsoa ho sebete sa likhoto le mefuta ea lisele tsa tumor; boholo le lebelo la phosphoproteome drift ke matrix- le ho itshetlehile ka mefuta, kahoo menyako e ka tlase e lokela ho nkuoa e le lintlha tsa ho qala tse lokelang ho netefatsoa hape bakeng sa mofuta o mong le o mong oa linama ho fapana le li-constants tsa bokahohleng..
Referense ea tumellano: Tšimo e hatisitse tataiso e fokolang ea tlaleho bakeng sa boitokisetso ba sampole ea phosphoproteomics tlas'a Tlhahisoleseding e Nyenyane Mabapi le Tokiso ea Mehlala ea Phosphoproteomics moralo, le litlhahlobo tsa kliniki ea biospecimen li khothaletsa ho fokotsa ischemia e batang ho tlase 30 metsotso bakeng sa lits'ebetso tsa phosphoproteomic. Ho hokahanya SOP ea hau le litekanyetso tsena tsa sechaba ho etsa hore mekhoa e bapisoe ka kotloloho lilaboratoring.
Taeo ea Cold-Chain le Moralo oa Lysis Buffer
Ka ntle ho fixation, mohato o mong le o mong ho tloha pokellong ea sampole ka protheine denaturation e na le kotsi ea enzymatic. Phokotso e sebetsang ke taolo ea mocheso e kopantsoeng le ho tšoaroa ha lik'hemik'hale.
Phosphoproteomics e tloaelehileng protocol e hlahlobiloeng ho PMC e bolela ka holim'a leqhoa kapa 4 ° C bakeng sa mehato eohle ea pele ho lysis 'me e khothalletsa −80 ° C ho boloka li-pellets tsa lisele ha ho ntšoa hang-hang.. Tsena ha se likhetho tse tloaelehileng; ke litlhoko tsa ho jara mojaro. Ho futhumala ha centrifugation, phalliso ea li-tube tsa mocheso oa kamore, kapa tieho lipakeng tsa mehato ea ho bokella e 'ngoe le e' ngoe e lekane ho hlahisa liphetoho tse ka lekanyetsoang tsa phosphorylation haeba ts'ebetso ea enzymatic e sa thibeloa hape ke lik'hemik'hale..
Khetho ea Phosphatase Inhibitor
Ho kenyelletsa phosphatase inhibitors ho lysis buffer ke leano le amohetsoeng ka ho fetesisa la ho ts'oara lik'hemik'hale, empa khetho ea inhibitor ha se ntho e nyane. Joalo ka Olsen le ba bang. e hlokometsoe tlhahlobisong ea bona ea PMC ea mekhoa ea ho ntlafatsa, ho kenyelletsoa ha li-protease le phosphatase inhibitors hangata hoa hlokahala, 'me phosphatase inhibitor e' ngoe le e 'ngoe e na le litšobotsi tse ikhethang. Sodium fluoride e thibela haholo-holo serine/threonine phosphatase; sodium orthovanadate ke tekanyetso ea tyrosine phosphatase; β-glycerophosphate e sebetsana le mefuta e mengata e pharalletseng ea serine/threonine phosphatase e nang le boemo bo botle ba ho lumellana le MS ho feta fluoride.. Ho sebelisa inhibitor e le 'ngoe ho koahela palo e felletseng ea ts'ebetso ea phosphatase ke mohloli o sa ananeloeng oa leeme le ikhethileng la sebaka - li-subsets tse ling tsa phosphoproteome li tla hlahisoa ka mokhoa o hlophisehileng haeba tšireletso ea inhibitor e na le likheo..
Peptide Synthesis Phosphatase inhibitor cocktails e etselitsoeng phosphoproteomics (mohlala, PhosSTOP kapa metsoako e lekanang) ho molemo ho feta mekhoa e sebelisoang ke motho a le mong bakeng sa ho sibolla mosebetsi. Bakeng sa li-workflows tse lebisitsoeng tse lebisitsoeng ho li-node tse khethehileng tsa lipontšo, khetho ea inhibitor e ka lekanyetsoa ho potoloha malapa a phosphatase a bohlokoa haholo ho baeloji e ithutoang.
⚠️ Tlhokomeliso: Tlosa phosphatase inhibitors pele ho ts'ilo ea proteolytic. Li-inhibitors tse 'maloa tse sebelisoang hangata - haholo-holo sodium fluoride - li kena-kenana le ts'ebetso ea trypsin, ho fokotsa ts'oaetso ea peptide le ho hlahisa leeme la tšilo e itšetlehileng ka tatellano. A 2021 PMC ho ithuta ka ho lokisetsa sampole ea phosphoproteomics e tiisa hore phosphatase inhibitor carryover mohatong oa tšilo ea lijo e fokotsa palo ea phosphopeptides e khethiloeng..
Ho khelosa Lysis joalo ka mokhoa o mong
Bakeng sa mefuta ea sampole moo ho ts'oaroa ha enzymatic ho sa lekana - haholo moo protheine complexes kapa organelle integrity butle inhibitor e kenellang - maemo a denaturing lysis (8 M urea, kapa lysis e thehiloeng ho SDS e lateloang ke ho tlosoa ha sesepa) fana ka leano la ho tsitsisa orthogonal. Potlako ea denaturation e emisa tšebetso ea enzymatic ka botlalo ho feta mekhoa e thehiloeng ho inhibitor, ka litšenyehelo tsa ho eketseha ho rarahana ha ho sebetsa ka tlaase ho metsi bakeng sa ho tlosoa ha sesepa. Bakeng sa liteko tsa mohala oa sele moo boemo ba phosphoproteome qetellong ea ts'usumetso e tlamehang ho ts'oaroa., denaturing lysis hangata ke khetho e phahameng ea botšepehi.
Liprothokhole tsa ho tsitsisa tse tsamaellanang le Sample Matrix
Pre-analytical variables are not identical across sample types. The following table maps the critical intervention by matrix, with acceptance criteria for each:
|
Sample Li-Peptide tsa Synthetic Matrix |
Key Pre-Analytical Risk |
Recommended Intervention |
Acceptance Criterion |
|---|---|---|---|
|
Cultured cells (adherent) |
Enzymatic drift during trypsinization / media removal |
Quench directly on plate with ice-cold PBS + inhibitors; aspirate and lyse immediately |
Time from quench to lysis ≤ 5 min; pellet stored at −80°C if not processed same day |
|
Cultured cells (ho emisoa) |
Pelleting delay at ambient temperature |
Centrifuge at 4°C immediately; remove supernatant on ice; flash-freeze pellet |
Pellet not warmer than 4°C at any point; freeze within 10 min of centrifuge stop |
|
Blood (PBMC isolation) |
Processing delay shifts phosphoprofile |
Begin PBMC isolation within 2 hours of draw; add inhibitors before density separation |
≤ 2 h delay; tokomane ho lieha nako ka tube |
|
Biopsy ea lisele (e ncha) |
Ischemia e batang |
Qhamisa ka har'a naetrojene e metsi ka har'a 20 mots oa resection; tokomane ea nako ea ischemia |
Ischemia e batang ≤ 20 min; kheloha e tšoauoa joalo ka covariate |
|
Lithane tsa FFPE |
Boleng ba ho lokisa le nako ea ischemia |
Sebelisa lisampole feela tse nang le ischemia e tlalehiloeng < 30 metsotso le formalin kgahlamelo 6–24 h |
Kenyelletsa kapa u hlakise lisampole tsohle ka nako e sa ngolisoang ea tokiso |
A 2021 Journal of Proteomics boithuto bo latela sephetho sa ho lieha ho itšehla thajana ha PBMC ho li-acute myeloid leukemia phosphorylation profiles. e fumane liphetoho tse hlokomelehang tsa phosphoproteome ka mor'a tieho ea lihora tse 24, esita le ka li-inhibitors tse teng. Sena se totobatsa hore na hobaneng litokomane tsa ho lieha e se rekoto ea boleng feela - ke mofuta oa liteko o ka ferekanyang papiso ea sehlopha haeba e sa bapisoe..
Liphetoho tse Matlafatsang kapa tse Fokotsang Lerata la Pele ho Analytical
Ntlafatso ea phosphopeptide ha se mohato oa khatello ea maikutlo. Every parameter of the enrichment — resin chemistry, loading pH, peptide-to-bead ratio, wash stringency, and elution conditions — interacts with the phosphopeptide population delivered by the sample preparation, and poorly controlled enrichment can amplify variance introduced upstream while masking it behind apparently clean MS data.
Khetho ea mokhoa oa ho ntlafatsa
The three dominant chemistries — IMAC (Fe³⁺, Ga³⁺, Zr⁴⁺, Ti⁴⁺), TiO₂, and sequential MOAC (SIMAC) — are not interchangeable. They carry different biases and respond differently to pre-analytical noise in the input peptide mixture.
|
Enrichment Method |
Selectivity Range |
pH Sensitivity |
Primary Bias |
Known Failure Mode |
|---|---|---|---|---|
|
Fe/Zr-IMAC |
Very high (>97% in optimized conditions) |
High — must load at pH 1.5–2.5 |
Low bias against multiply-phosphorylated peptides |
Li-non-phosphopeptides tse nang le asiti li qothisana lehlokoa haeba pH ea phallo e phahame haholo |
|
TiO₂ |
82-99% ho ipapisitse le ho kenya kenyelletso |
E itekanetseng - e hloka ho kenya acid (pH 2-2.5) |
E ka nka leeme ho pSer/pThr ho feta pTyr; mefuta e mengata ea phosphorylated e matlafalitsoeng ka tekanyo e phahameng ea lifaha |
Keketso ea asiti ea glycolic e ka fokotsa ho khetheha ho liprothokholo tse ling |
|
Sequential MOAC (SIMAC) |
Phatlalatso e pharaletseng ea baahi |
Keketso ho pholletsa le mehato e latellanang |
Phatlalatso e pharalletseng ka tatellano e nang le litšekamelo tse tlatsanang |
Litahlehelo tse rarahaneng le tse bokellaneng; prefractionation haholo kgothaletswa |
Lintlha tse tsoang ho a 2015 boithuto ba papiso ka PMC ho bapisa IMAC ea mehato e mengata le TiO₂ ea mehato e mengata e fumane hore mekhahlelo e meraro ea mokhoa o mong le o mong o hapile boholo ba li-phosphopeptide tse bonoang ho tsoa ho li-lysates tsa sele eohle., ka potoloho e 'ngoe le e 'ngoe ea tlatsetso e ntseng e fokotseha. A 2024 thuto e hlophisitsoeng hantle tlaleha >16,000 li-phosphopeptides tse khethiloeng ho tsoa molemong o le mong ha glycolic acid e le teng, ammonium hydroxide elution peresente, peptide-to-bead ratio, nako e tlamang, le molumo oa sampole kaofela li ne li kopanetsoe.
Mekhahlelo e 'meli e lokeloa ke tlhokomelo e khethehileng hobane hangata ha e hlalosoe hantle ho liprothokholo tse phatlalalitsoeng:
Karolelano ea peptide-to-bead: Resin e nyane haholo e natefisa li-peptide tse ngata tsa phosphorylated; resin e ngata haholo e eketsa tlamo e sa tobang ea li-peptide tse se nang phosphorylated tse nang le asiti. Tekolo ea bongata ba maano a ho ntlafatsa fumana TiO₂ e sebetsa hantle ka ho fetisisa ho 1:2–1:8 peptide-to-bead ratio (w/w).
E kenya pH: Tsebo e khethehileng bakeng sa IMAC le TiO₂ e eketseha haholo ha li-buffers li kenngoa ho pH 2-2.5 ka TFA kapa acetic acid.. Papisong e le 'ngoe ea POROS-Fe³⁺ le TiO₂, khetho e ntlafalitsoe ho tloha ho 12-18% ho isa ho 58-60% ha ho ne ho sebelisoa maemo a acidic loading.
Ho Sebelisa Maemo a ka hare a Phosphopeptide joalo ka Heke ea QC
E 'ngoe ea li-taolo tse sebetsang ka ho fetesisa tsa pele ho ntlafatso ke tatellano ea spiking e hlalositsoeng litekanyetso tsa phosphorylated peptide sebakeng se tsebahalang pele se ruisa. Ho tsosolosoa ha litekanyetso tsena ho pholletsa le mekhoa ea ntlafatso le LC-MS ho fana ka tlhahlobo ea katleho e ikemetseng e ikemetseng ho rarahana ha phosphoproteome ea tlhaho.. Haeba mokhoa oa ho hlaphoheloa o oela ka tlas'a moeli o hlalositsoeng - hangata 50-80% ho itšetlehile ka protocol - lebelo la ntlafatso le ka tšoauoa pele ho fumana lintlha tsa MS., ho thibela ho senya nako ea sesebelisoa ho sampole e senyehileng.
Bakeng sa phallo ea mosebetsi e hlokang ho tsitsana ha batch-to-batch, tsitsang ka hare tloaelo ea phosphopeptide synthesis ka bohloeki bo tiisitsoeng ba HPLC ≥ 95% le tiiso ea MS ea boitsebiso ba tatellano le kabelo ea phosphosite e fana ka boitsebiso bo hlokahalang ho boloka heke ena ea QC ho pholletsa le liteko..
LC-MS Parameters: Mohato oa ho Qetela oa Taolo ea Pele ho Tlhahlobo
Litlhophiso tsa ho fumana MS hangata li nkuoa e le bothata ba ho ntlafatsa ntle le ho itokisa mohlala. Ka tshebetso, li sebelisana le boleng ba pele ho tlhahlobo: sampole e senyehileng e ka bonahala e amoheleha tlas'a litlhophiso tse lumelletsoeng tsa ho fumana, ha sampuli e lokiselitsoeng hantle e ntse e ka 'na ea se ke ea sebetsa hantle ka maemo a sa tšoaneng a LC.
Bolelele ba Gradiente le Khetho ea Kholomo
Bakeng sa rarahaneng, metsoako e matlafatsang ea phosphopeptide, bolelele ba gradient le sebopeho sa kholomo li etsa qeto ea hore na phosphoproteome e hlophisitsoe hakae. A 2017 thuto ea optimization e hatisitsoeng ka PubMed e bontšitse hore ha e na fritless 50 kholomo ea cm e tletse 1.9 μm likaroloana, tsamaisa ka gradient e ntlafalitsoeng ea LC, tenyetsehile >23,000 phosphopeptides ka kholiseho e phahameng, emelang a 51% ntlafatso ea botebo ba tatellano ho feta litlhophiso tse khutšoane tsa kholomo. Tumellano e akaretsang ho tsoa lithutong tse ikhethileng tsa lisebelisoa e supa 90-120 min gradient e le sebaka se monate sa ho sibolla phosphoproteomics e sebelisang DDA ho lisebelisoa tsa Orbitrap tse phahameng haholo..
Litšiea tse tšesaane (75 μm ID kapa e nyane) li ratoa hobane phaello ea kutlo ea electrospray ka sekhahla sa phallo e fokotsehileng e lefella kutlo ea tlhaho ea ion-suppression ea phosphopeptides.. A 2024 pitsa e le 'ngoe ea microscale workflow study in Journal of Proteome Research e tlalehile ntlafatso ea kutloisiso ea makhetlo a 3.6 ho tloha ho a 100 μm ho a 25 cm × 75 μm, 1.7 μm kholomo ea C18.
Karohano le Ho Nepaha ha Sebaka
Bakeng sa sebaka sa phosphosite, khetho ea mokhoa oa ho arola e na le litlamorao tse tobileng tlase ho tlhaloso ea baeloji. A 2017 Journal of Proteome Research tlhahlobo ea liparamente tsa Orbitrap Fusion o ile a etsa qeto ea hore HCD e nang le high-resolution Orbitrap MS/MS e fana ka lipalo tse nepahetseng tsa boitsebahatso ba phosphosite., athe EThcD e ntlafatsa ts'epo ea sebaka ka seng sa PSM ka litšenyehelo tsa nako e telele ea mosebetsi le ho fokotsa kakaretso ea tlhahiso ea boitsebiso.. Tlhaloso e sebetsang: HCD ke eona kamehla e nepahetseng bakeng sa ho sibolloa ha mosebetsi; EThcD e na le mabaka a utloahalang ha palo e fokolang ea libaka tse nang le lintlha tse sa utloahaleng tsa sebaka seo li hlokang mosebetsi o itseng..
Tšilafalo ea Metal Ion ka har'a Sisteme ea LC
Mohloli o sa ananeloeng oa tahlehelo ea phosphopeptide nakong ea tlhahlobo ea LC-MS ke sebopeho se rarahaneng sa tšepe ea phosphopeptide ka har'a litsela tse nang le tšepe.. A 2022 ACS Omega tlhahlobo ea lintlha tsa kotsi tsa tsamaiso ea LC o fumane hore likarolo tsa LC tse thehiloeng ka tšepe li ka sequester phosphopeptides pele li fihla mohloling oa ESI, ka tlatsetso ea EDTA ho sampole ea solvent e khetholloang e le mokhoa o sebetsang oa ho hanyetsa ka ho thibela sebopeho se rarahaneng. Sena se bohlokoa haholo bakeng sa lilaboratori tse sa sebeliseng litsamaiso tsa bio-inert LC.
Moralo oa Taolo ea Pele ho Tlhahlobo: Lethathamo la Qeto ka Mothati
Moralo o latelang o hlophisa liphapang tsa pele ho tlhahlobo tse hlalositsoeng ka holimo ka tatellano e ka khonehang. Mokhahlelo o mong le o mong o lokela ho hlahlojoa pele o fetela ho o mong, ka liphapang tse ngotsoeng e le li-covariate tsa liteko ho fapana le ho lahloa ka khutso.
|
Sethala |
E fetohang |
Acceptance Criterion |
Ketso Haeba E hlolehile |
|---|---|---|---|
|
Pokello ea mohlala |
Ischemia e futhumetseng / tieho ea pokello |
≤ 20 min (lesela); ≤ 2 h (mali/PBMC) |
Kenyelletsa kapa folakha; tokomane ea nako ea ischemia joalo ka covariate |
|
Ho lokisa / botsitso |
Mocheso mohatong oa pele oa ho sebetsa |
0-4°C hohle |
Pheta pokello haeba protocol e tlotsoe; u se ke ua sebelisa sampole e sekiselitsoeng ntle le tlhaloso |
|
Lysis buffer |
Phaello ea phosphatase inhibitor |
Cocktail e koahela serine/threonine le tyrosine phosphatase |
Reformulate buffer; netefatsa ka ho hlaphoheloa ha spike ea litekanyetso tsa phosphopeptide |
|
Tšilo ea lijo |
Inhibitor carryover ka har'a tshilo ya dijo |
Li-inhibitor tse ka tlase li tlalehile moeli oa thibelo ea trypsin |
Letsoai pele ho tshilo; validate peptide coverage on a representative sample |
|
Enrichment input |
Peptide quantification |
Sufficient input mass for selected resin ratio |
Adjust resin quantity or reduce bead ratio; do not exceed validated peptide-to-bead range |
|
Enrichment execution |
Loading buffer pH |
pH 2.0–2.5 confirmed with indicator or pH meter |
Remake loading buffer; do not proceed with pH outside this range |
|
Enrichment QC |
Internal standard recovery |
≥ 50% recovery of spiked phosphopeptide standards |
Flag batch; re-enrich if sufficient sample remains; report recovery in methods |
|
LC-MS |
Column back-pressure and peak shape |
Within ±15% of baseline run; symmetrical phosphopeptide peaks |
Replace or re-equilibrate column; check for column aging or void |
|
LC-MS |
Phosphosite localization score |
≥ 75% of phosphopeptides with class I localization (score ≥ 0.75) |
Review enrichment specificity and instrument calibration |
Moralo ona ha o nke sebaka sa nts'etsopele ea mekhoa - o fana ka sebopeho sa tlhahlobo eo ho eona liqeto tsa ntlafatso ea mekhoa li etsoang le ho netefatsoa.
Leqephe la Rekoto la QC le Itokiselitseng ho Sebelisa
Tafole ea mohato ka mohato e kaholimo e ka sebetsa ha boleng bo bong le bo bong bo bohlokoa bo kenngoa ka batch. Lethathamo le ka tlase le etselitsoe hore le kopitsoe ka kotloloho bukeng ea ho ngolla ea laboratori kapa sistimi ea rekoto ea elektroniki, ka kholomo e le 'ngoe ka mohlala le sebaka se khelohileng se ngotsoeng:
|
Sebaka sa ho Rekota |
Boleng ba Mohlala |
Ho kheloha / Lintlha |
|---|---|---|
|
Mohlala oa ID le matrix |
Sebete, e foreshetsoe Tlhahiso ea Peptide |
- |
|
Ischemia e futhumetseng / tieho ea pokello |
14 min |
ka hare ho moeli |
|
Cold ischemia nako |
22 min |
ka hare ho moeli |
|
Mocheso mohatong oa pele oa ho sebetsa |
4°C |
- |
|
Lysis buffer + linomoro tsa lotho ea inhibitor |
PhosSTOP e ngata ####; Sehlopha sa NaF #### |
- |
|
Ho tlosoa ha inhibitor pele ho tšilo ea lijo (Y/N) |
Y |
- |
|
Ho ntlafatsa k'hemistri le bead batch |
TiO₂, ngata #### |
- |
|
Karolelano ea peptide-to-bead |
1:4 (w/w) |
- |
|
Loading buffer pH |
2.2 |
- |
|
Internal standard recovery (%) |
72% |
hodimo 50% Keiti |
|
Sekhahla sa sebaka sa Class I (%) |
81% |
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Ho rekota likarolo tsena ho fetola moralo hore e be rekoto ea boleng bo ka hlahisoang hape ho etsa hore ho kheloha ho hlahlojoe ho fapana le ho se bonahale..
Ho tloha ho Moralo ho ea ho Liqeto tse Reproducible
Sepheo sa taolo ea pele ho tlhahlobo ha se mokhoa o phethahetseng oa mokhoa. Ke bokhoni ba ho bapisa linaha tsa phosphoproteome ho pholletsa le lisampole, linako, kapa lihlopha tsa kalafo le litšobotsi tse hlokometseng liphapang ho baeloji ho fapana le ho sebetsana le lintho tsa khale. Moralo o hahiloeng holim'a mekhoa e amohelehang ea ho amoheloa, kheloho e ngotsoeng, le litekanyetso tsa ka hare li fetola phallo ea mosebetsi oa phosphoproteomics ho tsoa ho ts'epo e felletseng ea ho latela melaoana ho rekoto e hlakileng ea boleng..
Ho beha li-SOP maemong a mefuta eohle ea lisampole - le ho pholletsa le batho ba bokellang lisampole boithutong ba libaka tse ngata - ho hloka hore paramethara e 'ngoe le e 'ngoe ea bohlokoa e tafoleng e kaholimo e hlalosoe., lekantsoeng, mme e ngotswe, ha e khothalletsoe feela. Cold ischemia nako, nomoro ea lotho ea phosphatase inhibitor, beche ea lifaha e ruisang, le litekanyetso tsa ka hare tsa ho hlaphoheloa li lokela ho hlaha kaofela karolong ea mekhoa ea thuto efe kapa efe ea phosphoproteomics e bolelang hore e na le bohlokoa ba kliniki..
Bakeng sa lihlopha tse ahang kapa tse hlahlobang liphanele tsa litšupiso tsa phosphopeptide, Liphetoho tsa MOL litšebeletso tsa peptide CRO e ka ts'ehetsa sebopeho le sebopeho sa litekanyetso tse ikhethileng tsa phosphopeptide tse nang le litokomane tse felletseng tsa HPLC le MS CoA., ho fana ka motheo oa lisebelisoa bakeng sa ho tsitsa ka mokhoa o tsitsitseng oa QC ho pholletsa le liteko.
Mabapi le Tataiso ena le Bangoli ba eona
Sengoliloeng sena se lokisitsoe ke sehlopha sa tekheniki sa MOL Changes, eo mosebetsi oa eona o akaretsang tloaelo ea peptide synthesis, phosphopeptide phetoho, le sebopeho sa tshekatsheko (HPLC le MS) bakeng sa lipatlisiso le likopo tsa CRO. Moralo o hlahisitsoeng mona o kopanya lingoliloeng tse hatisitsoeng tsa boitokisetso ho fapana le ho tlaleha lintlha tse ncha tsa mantlha; moo re hlalosang menyako ea ts'ebetso, re bonts'a hore na li tsoa mehloling e hlahlobiloeng ke lithaka kapa ho tsoa mekhoeng ea ho itloaetsa ka mokhoa oa rona oa ho kopanya le QC workflows..
Ho boloka tataiso ena e nepahetse ebile e le ea morao-rao, e hlahlobiloe ka botekgeniki ka hare bakeng sa ho lumellana le mokhoa o tloaelehileng oa ho lokisetsa mohlala oa phosphoproteomics.. Babali ba hlokang mangolo a mangolo a seng makae, mekhatlo ea mekhatlo, kapa mohlahlobi oa mahlale ea bitsoang ka sepheo sa ho qotsa a ka kopa sephutheloana sa data ea tekheniki, e kenyeletsang lintlha tsa mohlahlobi le litokomane tse khethehileng.
Hlokomela: Litlaleho tsa sengoli sa botho le mekhatlo ea mekhatlo e ntse e phetheloa; karolo e ka holimo e tla nchafatsoa ka lintlha tse boletsoeng.
Khang ea taeo ea pele ho tlhahlobo qetellong ke khang ea ho tšepahala ho saense. Lintlha tsa phosphoproteomics tse ke keng tsa lateloa nalaneng ea sampole e laoloang li ke ke tsa hlalosoa ka mokhoa o tšepahalang - eseng hobane spectrometer ea bongata e buile leshano., empa hobane letshwao la baeloji leo le neng le le lekanya e ne e se e le motswako wa biology le ho tshwara. Theha moralo pele ho ho ntšoa. Liqeto tsa hao li itšetlehile ka eona.
Mosebetsing oa rona oa ho kopanya le oa QC o fanang ka litekanyetso tsa phosphopeptide, re kopana le ntlha e sebetsang ea liphuputso tsena khafetsa: ho hlaphoheloa ha maemo a spiked ho fapana ka mokhoa o lekanyelitsoeng le lintlha tsa ho sebetsana le lintlha tse hlalositsoeng ka holimo, ke ka lebaka leo re nkang nalane ea sampole e ngotsoeng e le e ke keng ea arohanngoa le sephetho sa tlhahlobo. Ho ena le ho hloleha ho hong ho makatsang, mokhoa o iphetang ke khoholeho e liehang ea boleng ba matšoao eo ho leng bonolo ho e fosa ho fihlela papiso ea batch e hloleha.. Re thehile litekanyetso tsa ho amohela sengoloa sena ho bonahatsa 'nete eo ea ts'ebetso, 'me re khothaletsa lihlopha ho ngola lintlha tsa motheo tsa ho hlaphoheloa bakeng sa protocol ea bona e tloaelehileng e le hore ho kheloha leha e le hofe ho ka bonahala pele ho etsa hore papiso e se ke ea sebetsa..
Itokiselitse ho buisana ka lintlha tsa litšupiso tsa peptide bakeng sa phallo ea hau ea phosphoproteomics QC?
Litšupiso
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Hobaneng ha phosphoproteomics e ntse e le phephetso - Limolek'hule tsa BioSystems (2015). https://pubs.rsc.org/en/content/articlehtml/2015/mb/c5mb00024f
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Taolo ea tyrosine phosphorylation ka har'a membrane e ka thoko ea T ka ho thibela protheine ea tyrosine phosphatases - PubMed (1998). https://pubmed.ncbi.nlm.nih.gov/9712039/
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Tyrosine phosphorylation le Src family kinases li laola keratinocyte cell-cell adhesion - PMC (1998). https://pmc.ncbi.nlm.nih.gov/articles/PMC2132783/
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Litlhahlobo tsa tyrosine phosphorylation liseleng tsa motho - PMC (2019). https://pmc.ncbi.nlm.nih.gov/articles/PMC7379381/
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Liphetoho tse sa tobang tsa phosphoproteome tse bakoang ke serame sa ischemia - Journal of Proteome Research (2013). https://pubs.acs.org/doi/abs/10.1021/pr400451z
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Polelo ea Phosphoepitope le ho lokisoa ha nako ka har'a lisele tsa FFPE - Patlisiso ea laboratori (2014). https://www.nature.com/articles/labinvest2014139
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Cold ischemia liseleng tsa hlahala: litlamorao tsa tlhahlobo ea phosphostatus - PMC (2021). https://pmc.ncbi.nlm.nih.gov/articles/PMC7893972/
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Protocol e tloaelehileng ea ho lokisetsa sampole ea phosphoproteomics - PMC (2012). https://pmc.ncbi.nlm.nih.gov/articles/PMC3332032/
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Olsen le ba bang., Mekhoa ea ho ntlafatsa e sebelisoang phosphoproteomics - PMC (2011). https://pmc.ncbi.nlm.nih.gov/articles/PMC3418503/
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Tokiso ea sampole ea phosphoproteomic e ama tlhaloso ea tlhaho - PMC (2021). https://pmc.ncbi.nlm.nih.gov/articles/PMC8699897/
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Papiso ea mehato e mengata ea IMAC le matlafatso ea TiO₂ ea mehato e mengata - PMC (2015). https://pmc.ncbi.nlm.nih.gov/articles/PMC4766865/
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Ntlafatso e hlophisitsoeng ea ntlafatso ea phosphopeptide ea TiO₂ - PMC (2024). https://pmc.ncbi.nlm.nih.gov/articles/PMC11087715/
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Tekolo e lekantsoeng ea maano a ho ntlafatsa phosphopeptide - PMC (2016). https://pmc.ncbi.nlm.nih.gov/articles/PMC4849134/
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Ho kenya acidic ho ntlafatsa khetho ea IMAC le TiO₂ - PubMed (2012). https://pubmed.ncbi.nlm.nih.gov/22406350/
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Kholo e telele ea LC optimization bakeng sa phosphoproteomics - PubMed (2017). https://pubmed.ncbi.nlm.nih.gov/28634120/
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Phallo ea tšebetso ea phosphoproteomics ea pitsa e le 'ngoe - Journal of Proteome Research (2024). https://pubs.acs.org/doi/10.1021/acs.jproteome.3c00862
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Tekolo ea mekhahlelo ea ho arohana bakeng sa sebaka sa phosphosite - Journal of Proteome Research (2017). https://pubs.acs.org/doi/10.1021/acs.jproteome.7b00337
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Silafatso ea tšepe ea LC le tahlehelo ea phosphopeptide - ACS Omega (2022). https://pubs.acs.org/doi/10.1021/acsomega.2c05616
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Tlhahisoleseding e Nyenyane Mabapi le Tokiso ea Mehlala ea Phosphoproteomics - Tlhaho Pele (2009). https://www.nature.com/articles/npre.2009.3131.1
Ikopanye le sehlopha sa tekheniki sa MOL Changes ka rona litšebeletso tsa peptide leqepheng la ho kopa therisano ea tekheniki kapa sephutheloana sa data se khethehileng haholo.
