Qhov sib txawv tseem ceeb ntawm alpha keratin thiab beta keratin yog tias alpha keratin tshwm sim hauv cov tsiaj nyeg whereas beta keratin tshwm sim hauv epidermis ntawm cov tsiaj reptiles.
Keratin yog ib pab pawg neeg muaj protein ntau, thiab peb tuaj yeem txhais tau tias nws yog cov protein ntau uas tsim cov txheej txheem tseem ceeb ntawm cov plaub hau, plaub, claws, horns, thiab lwm yam. Cov alpha keratin thiab beta keratin yog ob hom keratin., uas tshwm sim nyob rau hauv cov tsiaj. Qhov txawv ntawm alpha keratin thiab beta keratin yog nyob ntawm hom tsiaj uas peb tuaj yeem pom txhua keratin.
Alpha Keratin yog dab tsi?
Alpha keratin yog hom protein uas peb tuaj yeem pom hauv cov tsiaj nyeg. Cov protein no tshwm sim hauv cov plaub hau, horns, rau tes thiab epidermal txheej ntawm daim tawv nqaij. Peb tuaj yeem categorize nws raws li ib tug fibrous, structural protein. Qhov no txhais tau hais tias alpha keratin muaj cov amino acids uas tsim ib qho kev rov ua dua tshiab. Cov qauv no zoo ib yam li cov qauv alpha helix ntawm cov protein. Ntxiv mus, nws ua ib co coiled. Vim yog cov qauv no, nws ua raws li cov khoom siv roj ntsha muaj zog rau ntau yam siv hauv cov tsiaj.
Hauv peb lub cev, cov protein no ua los ntawm cov protein biosynthesis. Cov txheej txheem siv cov ntawv sau thiab txhais lus ib yam. Txawm li cas los xij, thaum lub hlwb loj hlob, thiab muaj ntau tshaj li alpha keratin txaus hauv lub cell, nws tuag. Qhov no tsim kom muaj zog, tsis muaj vascular crust ntawm cov ntaub so ntswg keratinized.
Daim duab 01: Cov qauv ntawm Alpha Keratin
Feem ntau, alpha keratin siab nrog alanine, leucine, arginine thiab cysteine. Cov amino acids no pab tsim kom muaj txoj cai helix qauv thiab sab laug-tes helical qauv. Peb hu nws, "coiled coil". Thaum xav txog cov khoom ntawm cov protein no, nws muaj kev ruaj ntseg zoo. Thaum nws nthuav tawm rau txhua yam kev ntxhov siab, cov protein no tuaj yeem khaws nws cov qauv thiab cov duab, tiv thaiv qhov nws nyob ib puag ncig. Nyob rau hauv siab nruj, nws tuaj yeem hloov mus rau hauv beta keratin ib yam nkaus.
Y Beta Keratin yog dab tsi?
Beta keratin yog cov txheej txheem protein uas tshwm sim feem ntau hauv cov epidermis ntawm cov tsiaj reptiles. Lub npe ntawm cov protein no tau muab rau nws vim nws qhov tshwm sim; Nws tshwm sim raws li cov khoom nyob rau hauv epidermal stratum corneum uas yog nplua nuj nyob rau hauv stacked beta pleated nplooj ntawv. Qhov no tau ua rau lub npe hu ua "corneous beta-proteins" lossis "keratin txuam beta proteins" es tsis txhob beta keratin vim tias lo lus keratin Ameslikas hais txog alpha keratin.
Cov protein no tuaj yeem ua kom nruj dua rau daim tawv nqaij ntawm cov tsiaj reptiles. Ntxiv mus, nws muab lawv nrog waterproofing thiab tiv thaiv ntawm desiccation. Tsis tas li ntawd, tsev neeg avian kuj tseem muaj cov protein no. Piv txwv li, hauv cov noog, nplai, beak, claws thiab feathers yuav muaj beta keratin.
Qhov txawv ntawm Alpha Keratin thiab Beta Keratin yog dab tsi?
Alpha keratin yog ib hom protein uas peb tuaj yeem pom hauv cov tsiaj nyeg whereas beta keratin yog cov protein ntau uas tshwm sim hauv cov kab mob ntawm cov tsiaj reptiles. Qhov no yog qhov sib txawv tseem ceeb ntawm alpha thiab beta keratins. Thaum xav txog lawv qhov tshwm sim, alpha keratin tshwm sim hauv cov plaub hau, horns, rau tes thiab txheej txheej ntawm daim tawv nqaij thaum beta keratin tshwm sim hauv cov tawv nqaij tsiaj reptile; nyob rau hauv epidermal stratum corneum nyob rau hauv lawv daim tawv nqaij uas yog nplua nuj nyob rau hauv stacked beta pleated nplooj ntawv. Ntxiv rau qhov ntawd, lwm qhov sib txawv ntawm alpha thiab beta keratin yog tias alpha keratin muab cov tsiaj txhu nrog cov qauv kev ruaj ntseg whereas beta keratin muab rigidity rau daim tawv nqaij, waterproofing, thiab tiv thaiv desiccation rau cov tsiaj reptiles.
Summary – Alpha Keratin vs Beta Keratin
Alpha thiab beta keratin yog ob hom proteins uas muaj cov qauv. Yog li ntawd, muaj ob peb qhov sib txawv ntawm lawv. Qhov tshwm sim ntawm cov proteins no yog qhov sib txawv tseem ceeb ntawm alpha keratin thiab beta keratin. Ntawd yog, alpha keratin tshwm sim hauv cov tsiaj nyeg whereas beta keratin tshwm sim nyob rau hauv epidermis ntawm cov tsiaj reptiles.
