Qhov sib txawv tseem ceeb ntawm cov kab sib txuas thiab cov kab sib luag thiab cov kab sib luag beta pleated yog tias nyob rau hauv parallel beta pleated nplooj ntawv, polypeptide strands khiav nyob rau hauv tib txoj kev, thaum nyob rau hauv antiparallel beta pleated nplooj ntawv, nyob sib ze strands khiav nyob rau hauv opposite lus qhia.
Beta pleated sheet lossis beta sheet yog ib qho qauv thib ob ntawm cov proteins. Muaj hydrogen bonds ntawm beta strands ua ib tug twisted pleated tsos. Polypeptide strand tuaj yeem khiav hauv tib qho kev taw qhia lossis rov qab kev taw qhia. Raws li qhov ntawd, muaj ob hom loj ntawm cov nplooj ntawv beta raws li cov nplooj ntawv sib npaug beta pleated thiab cov nplooj ntawv antiparallel beta pleated. Nyob rau hauv parallel beta pleated nplooj ntawv, muaj ob polypeptide strands khiav nyob rau hauv tib txoj kev. Nyob rau hauv antiparallel beta pleated nplooj ntawv, muaj polypeptide strands khiav nyob rau hauv lub opposite lus qhia.
Parallel Beta Pleated Sheets yog dab tsi?
Parallel beta pleated sheets yog cov nplooj ntawv beta uas muaj ob lub polypeptide strands khiav hauv tib txoj kev. Cov txheej txheem thib ob no tsis tshua muaj kev ruaj khov dua li cov ntaub ntawv sib luag beta pleated vim tias cov ntawv cog lus hydrogen nyob rau hauv parallel beta-daim ntawv tsis yog linear. Muaj 12 atoms nyob rau hauv txhua lub nplhaib sib koom ua ke hydrogen hauv ib daim ntawv sib luag beta.
Daim duab 01: Parallel Beta Pleated Sheets
Nyob rau hauv cov ntawv sib npaug beta, tag nrho cov N-termini ntawm polypeptide strands yog taw qhia tib yam. Parallel β nplooj ntawv tsawg dua tsib strands tsis tshua muaj vim tias tsis tshua muaj hydrogen bonds ruaj khov ntawm strands.
Dab tsi yog Antiparallel Beta Pleated Sheets?
Antiparallel beta pleated nplooj ntawv yog hom thib ob loj ntawm cov nplooj ntawv beta ntawm cov protein. Nyob rau hauv antiparallel beta nplooj ntawv, cov nyob sib ze ob polypeptide strands khiav nyob rau hauv lub opposite direction. Tus naj npawb ntawm cov atoms nyob rau hauv txhua lub nplhaib hydrogen bonded alternates ntawm 14 thiab 10. Txij li thaum hydrogen bonds nyob rau hauv ib tug antiparallel beta-daim ntawv yog linear, nws yog ruaj khov dua thaum uas tig mus beta nplooj.
Daim duab 02: Antiparallel Beta Pleated Sheets
Nyob rau hauv cov nplooj ntawv antiparallel beta, N-terminus ntawm ib strand yog nyob ib sab mus rau C-terminus ntawm lub strand tom ntej. Qhov kev npaj no ua rau muaj kev ruaj ntseg ntawm kev sib tshuam. Antiparallel β-cov ntawv yog cov proteins ib txwm muaj.
Dab tsi zoo sib xws ntawm Parallel thiab Antiparallel Beta Pleated Sheets?
- Parallel thiab antiparallel beta pleated nplooj ntawv yog ob hom loj ntawm cov nplooj ntawv beta.
- Nyob rau hauv ob hom, polypeptide strands yog tuav ua ke los ntawm hydrogen bonding ntawm strands.
- Ob daim ntawv yog pom nyob rau hauv ib txwm muaj proteins.
- Lawv yog cov txheej txheem protein thib ob.
Qhov txawv ntawm Parallel thiab Antiparallel Beta Pleated Sheets yog dab tsi?
Parallel beta pleated nplooj ntawv muaj ob lub polypeptide strands khiav hauv tib qho kev taw qhia thaum cov nplooj ntawv antiparallel beta pleated muaj ob lub polypeptide strands khiav ntawm cov lus qhia. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov ntaub ntawv sib luag thiab antiparallel beta pleated nplooj ntawv. Ntxiv mus, hydrogen bonds nyob rau hauv parallel beta sheets tsis ruaj khov thaum hydrogen bonds nyob rau hauv antiparallel beta nplooj ntawv yog zoo oriented, muaj zog thiab ruaj khov.
Cov hauv qab no infographic teev qhov sib txawv ntawm qhov sib npaug thiab antiparallel beta pleated nplooj ntawv hauv daim ntawv.
Summary – Parallel vs Antiparallel Beta Pleated Sheets
Ob lub polypeptide strands txuas mus rau tib qho kev taw qhia hauv cov ntawv sib npaug beta. Nyob rau hauv sib piv, ob polypeptide strands txuas mus rau qhov opposite kev taw qhia nyob rau hauv antiparallel beta pleated nplooj ntawv. Ntxiv mus, tus naj npawb ntawm cov atoms nyob rau hauv txhua lub nplhaib hydrogen bonded nyob rau hauv parallel beta nplooj ntawv yog 12 thaum nws alternates ntawm 14 thiab 10 nyob rau hauv antiparallel beta nplooj ntawv. Thaum xav txog kev ruaj ntseg ntawm txhua hom beta daim ntawv, antiparallel beta pleated nplooj ntawv yog ruaj khov dua li cov ntawv sib npaug beta. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm qhov sib npaug thiab antiparallel beta pleated nplooj.
