Kev sib cuam tshuam ntawm hydrogen-bonding ntawm cysteine, uas tuaj yeem ua tushydrogen-daim ntawv cog lus pubthiab / lossis tus neeg txais, ua lub luag haujlwm tseem ceeb hauv cysteine ntau lub luag haujlwm hauv cov protein.
Yuav ua li cas daim ntawv cog lus tuaj yeem tsim cysteine?
Cysteine yog tib cov amino acid uas nws cov saw hlau tuaj yeem tsim covalent bonds , yielding disulfide txuas nrog lwm cov cysteine sab chains: --CH 2 -S-S-CH2--. Ntawm no, cysteine 201 ntawm tus qauv peptide tau pom tias muaj kev sib raug zoo nrog cysteine 136 los ntawm ib qho β-strand uas nyob ib sab.
Cov amino acids twg tuaj yeem tsim cov ntawv cog lus hydrogen?
3 amino acids (arginine, lysine thiab tryptophan) muaj hydrogen pub atoms hauv lawv cov saw hlau.
YYuav ua li cas daim ntawv cog lus yog cysteine thiab cysteine?
Cov no yog covalent bonds uas tsim los ntawm R-pab pawg ntawm ob cysteine amino acids nyob ntawm ntau txoj haujlwm hauv thawj theem. Txhua yam ntawm cysteine amino acids muaj sulfur atom ua ib feem ntawm nws pawg R.
Puas serine thiab cysteine tsim hydrogen bonds?
Hydrogen bonding hauv lub helix muab txoj hauv kev rau serine, threonine thiab cysteine residues kom txaus siab rau lawv cov hydrogen-bonding muaj peev xwm tso cai rau cov residues tshwm sim nyob rau hauv helices faus nyob rau hauv ib tug hydrophobic milieu.
