Proline feem ntau pom thaum kawg ntawm α helix lossis tig los yog voj. Tsis zoo li lwm cov amino acids uas muaj nyob yuav luag tshwj xeeb hauv kev hloov pauv hauv polypeptides, proline tuaj yeem muaj nyob hauv cis-configuration hauv peptides.
Puas alpha helices muaj proline residues?
Tam sim no muaj ntau dua 30, 000 cov qauv protein nyob hauv Protein Data Bank, nws pom tseeb tias proline residues muaj nyob hauv α-helices, qhov chaw uas lawv feem ntau ua lub luag haujlwm tseem ceeb. hauv cov qauv thiab kev ua haujlwm ntawm cov protein.
Dab tsi amino acids nyob hauv alpha helices?
Ib yam ntawm 20 amino acids tuaj yeem koom nrog α-helix tab sis qee qhov nyiam dua lwm tus. Ala, Glu, Leu, thiab Met feem ntau pom hauv helices whereas, Gly, Tyr, Ser, thiab Pro tsis tshua pom.
Pob cov nplooj ntawv beta muaj proline?
Proline tsis nyiam nyob rau hauv cov qauv ntawv beta vim nws tsis tuaj yeem ua tiav H-bonding network. Thaum proline tshwm sim hauv cov nplooj ntawv, nws yuav nyob rau hauv lub pob los yog daim ntawv ntug uas tsis muaj cov amino hydrogen daim ntawv cog lus tsis tseem ceeb.
Dab tsi muaj alpha helices?
The alpha helix (α-helix) yog ib qho motif nyob rau hauv cov qauv thib ob ntawm cov proteins thiab yog txoj cai tes-helix conformation nyob rau hauv uas txhua tus caj qaum N-H pawg hydrogen daim ntawv cog lus rau qaum C=O. pawg ntawm cov amino acid nyob rau plaub seem ua ntej raws li cov protein ntau.
