protein中国医科大学 蛋白质 生物化学 英文 PPT课件

iesExplorationofproteinsProteomics:posedofaminoacidslinkedtogetherthroughpeptidebonds.Whatareproteins?themostwidelydistributedbiomoleculesthemostabundantbiomolecules(45%ofhumanbody)plexbiomoleculesthemostdiversifiedbiologicalfunctionsHowareaboutproteins?Whatdoproteinsdo?ponentsofProteinsmajorelementsC(50~55%),H(~7%),O(19~20%),N(13~19%),S(~4%)traceelementsP,Fe,Cu,Zn,I,…ComponentsofproteinsTheaveragenitrogencontentinproteinsisabout16%,andproteinsarethemajorsourceofNinbiologicalsystems.Theproteinquantitycanbeestimated.proteinin100gsample=Npergramx6.25x100§1.1AminoAcidsThebasicbuildingblocksofproteinsAbout300typesofAAsinnature,butonly20typesareusedforproteinsynthesisinbiologicalsystems.Aaminogroup,acarboxylgroup,aHatomandaRgroupareconnectedtoaCatom.TheCatomisanopticallyactivecenter.L-Aminoacid