Dab tsi yog alpha helix thiab beta pleated ntawv?
Dab tsi yog alpha helix thiab beta pleated ntawv?

Video: Dab tsi yog alpha helix thiab beta pleated ntawv?

Video: Dab tsi yog alpha helix thiab beta pleated ntawv?
Video: Hmoob tus cawm seej part 65 Hmong storieds 苗族的故事 2024, Kaum ib hlis
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Secondary Structure ntawm Protein

Ob tug fibrous qauv lub alpha helix , thiab cov beta pleated ntawv , uas yog structural Cheebtsam ntawm lub cell. Cov alpha helix yog tsim thaum polypeptide chains twist mus rau hauv ib tug kauv. Cov beta pleated ntawv yog polypeptide chains khiav ntawm ib sab.

Kuj paub, qhov txawv ntawm alpha helix thiab beta pleated ntawv yog dab tsi?

Cov alpha helix yog ib txoj hlua polypeptide uas yog tus pas nrig-puab thiab coiled hauv a Caij nplooj ntoos hlav zoo li qauv, tuav los ntawm hydrogen bonds. Beta pleated nplooj ntawv ua los ntawm beta strands txuas tom qab los ntawm ob los yog ntau dua hydrogen bonds ua ib tug qaum. Txhua beta strand, los yog saw, yog ua los ntawm 3 mus rau 10 amino acid residues.

Ib yam li ntawd, cov nplooj ntawv beta pleated ua li cas? Feem ntau, ib qho anti-parallel beta - pleated ntawv cov ntaub ntawv thaum ib tug polypeptide saw sharply reverses kev taw qhia. Qhov no tuaj yeem tshwm sim nyob rau hauv lub xub ntiag ntawm ob qho tib si proline residues, uas tsim ib lub kaum sab xis ntawm cov saw hlau polypeptide thiab khoov nws rov qab rau nws tus kheej.

Hauv qhov no, theem ntawm cov qauv protein cuam tshuam nrog alpha helix thiab beta pleated ntawv?

Secondary qauv Feem ntau ntawm cov txheej txheem thib ob yog α helix thiab β pleated ntawv. Ob lub qauv yog tuav hauv cov duab los ntawm hydrogen bonds, uas tsim ntawm carbonyl O ntawm ib amino acid thiab cov amino H ntawm lwm tus.

Dab tsi yog α helices thiab β nplooj ntawv muaj qhov sib xws?

ib helix twb xub pom nyob rau hauv α - keratin, uas yog nplua nuj nyob rau hauv daim tawv nqaij thiab nws derivative. b paj tau pom nyob rau hauv cov protein fibroin, cov ntsiab lus tseem ceeb ntawm txhob lo lo ntxhuav. Ob lub folding qauv no yog tshwj xeeb feem ntau vim hais tias lawv tshwm sim los ntawm hydrogen bonds tsim ntawm N-H thiab C = O pab pawg nyob rau hauv polypeptide qaum.

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