摘要
IAPs(inhibitorsofapoptosis)areafamilyofproteinscontainingoneormorecharacteristicBIRdomains.Theseproteinshavemultiplebiologicalactivitiesthatincludebindingandinhibitingcaspases,regulatingcellcycleprogression,andmodulatingreceptor-mediatedsignaltransduction.OurrecentstudiesfoundtheIAPfamilymembersXIAPandc-IAP1areubiquitinatedanddegradedinproteasomesinresponsetoapoptoticstimuliinTcells,andtheirdegradationappearstobeimportantforTcellstocommittodeath.InadditiontothreeBIRdomains,eachoftheseIAPsalsocontainsaRINGfingerdomain.Wefoundthisregionconfersubiquitinproteaseligase(E3)activitytoIAPs,andisresponsiblefortheauto-ubiquitinationanddegradationofIAPsafteranapoptoticstimulus.GiventhefactthatIAPscanbindavarietyofproteins,suchascaspasesandTRAFs,itwillbeofinteresttocharacterizepotentialsubstratesoftheE3activityofIAPsandtheeffectsofubiquitinationbyIAPsonsignaltransduction,cellcycle,andapoptosis.
出版日期
2000年03月13日(中国期刊网平台首次上网日期,不代表论文的发表时间)