Video: Dab tsi yog alpha helix thiab beta pleated ntawv?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Pom zoo:
Dab tsi yog qhov txawv ntawm daim ntawv cog lus lub zog thiab daim ntawv cog lus dissociation zog?
Qhov sib txawv tseem ceeb ntawm kev sib txuas ntawm lub zog thiab lub zog bonddissociation yog tias lub zog sib txuas yog qhov nruab nrab ntawm lub zog xav tau los rhuav tshem tag nrho cov kev sib txuas ntawm tib ob hom atoms nyob rau hauv ib qho chaw sib txuas whereas daim ntawv cog lus dissociation zog yog tus nqi ntawm cov hluav taws xob xav tau los rhuav tshem ib qho kev sib koom ua ke inhomolysis
Dab tsi yog qhov txawv ntawm alpha thiab beta thiab gamma?
Alpha hais yog nquag (ceev) helium nuclei, beta hais me me thiab muaj ib nrab tus nqi, ua lub zog electrons (los yog positrons) tsuas yog cov gamma particles yog photons, piv txwv li, lawv tsis loj heev hais, lawv yog ib daim ntawv ntawm electromagnetic. hluav taws xob, ib daim ntawv muaj zog tshaj X-rays
Txoj kev faib cov ntaub ntawv twg muab cov ntaub ntawv sib npaug ntawm cov ntaub ntawv lossis cov kev tshuaj xyuas hauv txhua chav kawm cov ntaub ntawv?
Quantile. txhua chav kawm muaj cov yam ntxwv sib npaug. Ib qho kev faib tawm ntau yog zoo haum rau cov ntaub ntawv faib tawm. Quantile muab tib tus lej ntawm cov ntaub ntawv muaj nuj nqis rau txhua chav kawm
Dab tsi yog alpha thiab beta lwj?
Hauv Alpha Decay lub nucleus tau muab faib ua 2 ntu nrog ib qho ntawm cov khoom no - alpha particle - zooming tawm mus rau hauv qhov chaw. Lub nucleus muaj nws tus lej atomic txo los ntawm 2 thiab nws cov lej raug txo los ntawm 4 (2 protons thiab 2 neutrons raug tshem tawm). Beta Decay. Hauv Beta Decay ( rho tawm ) ib lub neutron hloov mus ua ib qho proton
Cov txheej txheem protein ntau npaum li cas suav nrog alpha helices thiab beta pleated nplooj?
Cov qauv ntawm cov proteins tseem ceeb tsuas yog qhov kev txiav txim ntawm cov amino acids ua ke los ntawm peptide bonds los ua ib txoj hlua polypeptide. Cov qauv thib ob yog hais txog alpha helices thiab beta pleated nplooj ntawv tsim los ntawm hydrogen bonding nyob rau hauv feem ntawm cov polypeptide