Qhov sib txawv tseem ceeb ntawm ferredoxin thiab Rubredoxin yog tias ferredoxin muaj peev xwm txo qis redox piv rau Rubredoxin.
Ob leeg ferredoxin thiab Rubredoxin yog cov protein uas muaj hlau. Txawm li cas los xij, peb tuaj yeem pom ferredoxin hauv cov kab mob thiab hauv cov nroj tsuag vim nws yog chloroplast-protein. Txawm li cas los xij, Rubredoxin yog cov protein uas tshwm sim hauv cov kab mob thiab archaea nkaus xwb. Ob lub tebchaw no muaj cov qauv zoo sib xws.
Ferredoxin yog dab tsi?
Ferredoxin yog cov hlau-sulfur uas muaj cov protein. Nws koom nrog hauv kev kho kom haum xeeb ntawm kev hloov pauv hluav taws xob hauv ntau yam kev cuam tshuam metabolic. Cov no yog cov protein me me uas yog dej-soluble, thiab lawv muaj nyob hauv chloroplasts. Cov hlau thiab sulfur atoms nyob rau hauv cov protein no yog teem rau hauv cov hlau-sulfur pawg. Lawv tuaj yeem ua raws li cov khoom siv roj ntsha los ntawm kev lees txais thiab tso tawm hluav taws xob. Ntawm no, lub xeev oxidation ntawm hlau atoms hloov ntawm +2 mus rau +3. Yog li ntawd, lawv ua raws li kev hloov pauv hluav taws xob hauv cov tshuaj tiv thaiv redox uas tshwm sim hauv ib puag ncig lom neeg. Piv txwv li, lub peev xwm redox ntawm cov protein no tsawg. Ib qho ferredoxin protein molecule tuaj yeem muaj ob, peb lossis plaub hlau atoms rau ib qho protein molecule. Muaj peb hom ferredoxins: Fe2S2 ferredoxins, Fe4S 4 ferredoxins thiab Fe3S4 ferredoxins.
Lub luag haujlwm tseem ceeb ntawm ferredoxin yog txhawm rau faib cov hluav taws xob hluav taws xob siab hauv chloroplast, thiab cov proteins no koom nrog kev faib cov hluav taws xob uas xav tau rau carbon dioxide fixation, nitrile txo, txo sulfite, glutamate synthesis, cyclic electron flow, thiab lwm yam.
Rubredoxin yog dab tsi?
Rubredoxin yog cov protein uas muaj hlau uas tuaj yeem pom hauv cov kab mob thiab archaea. Nws yog ib yam ntawm cov protein uas tsis muaj molecular-yuag (feem ntau cov proteins yog cov sib xyaw ua ke siab molecular). Txawm li cas los xij, tsis zoo li ferredoxin, Rubredoxin protein tsis muaj inorganic sulfides. Lub luag haujlwm tseem ceeb ntawm Rubredoxin yog tias nws koom nrog cov txheej txheem hloov hluav taws xob hauv cov tshuaj tiv thaiv redox uas tshwm sim hauv cov kab mob lom.
Thaum xav txog cov qauv ntawm Rubredoxin, nws muaj lub hauv paus hlau atom uas muaj ze li ntawm tetrahedral geometry. Plaub pawg uas raug khi rau cov hlau atom no yog cysteine residues. Feem ntau ntawm Rubredoxin proteins yog dej-soluble tshuaj hom. Txawm li cas los xij, muaj qee hom insoluble uas muaj nyob rau hauv daim nyias nyias cov proteins. E.g. Rubredoxin-A.
Thaum lub sijhawm hloov pauv hluav taws xob, lub xeev oxidation ntawm lub hauv paus hlau atom hloov ntawm +2 txog +3. Peb tuaj yeem paub qhov kev hloov pauv no hauv lub xeev oxidation tau yooj yim vim tias cov xim hloov ntawm liab mus rau xim tsis muaj xim. Thaum lub sij hawm hloov no, cov hlau ion tseem nyob rau hauv lub xeev siab-spin vim nws yuav pab tau kom txo tau cov qauv kev hloov ntawm cov protein. Feem ntau, qhov txo qis ntawm Rubredoxin yog siab dua ferredoxin; Nws yog nyob rau hauv thaj tsam ntawm +50 mV rau -50 mV.
Qhov txawv ntawm Ferredoxin thiab Rubredoxin yog dab tsi?
Ferredoxin thiab Rubredoxin yog cov protein sib txuas uas muaj cov hlau thiab sulfur ua cov khoom. Qhov sib txawv tseem ceeb ntawm ferredoxin thiab Rubredoxin yog tias ferredoxin muaj peev xwm txo qis redox piv rau Rubredoxin. Lub peev xwm redox ntawm ferredoxin yog hais txog -420 mV, thiab lub peev xwm redox ntawm Rubredoxin yog li ntawm -50 txog +50 mV. Tsis tas li ntawd, ferredoxin tuaj yeem muaj ob, peb lossis plaub lub hlau atoms rau ib qho protein molecule, tab sis hauv Rubredoxin, muaj ib lub hauv paus hlau atom. Txawm li cas los xij, ob qho tib si cov molecules muaj qhov zoo sib xws tetrahedral geometry nyob ib ncig ntawm cov hlau atoms.
Tsis tas li ntawd, ferredoxin muaj cov sulfur inorganic raws li ib feem ntawm cov protein molecule, tab sis tsis muaj inorganic sulfur hauv Rubredoxin. Thaum xav txog qhov tshwm sim, ferredoxin tuaj yeem tshwm sim hauv ob hom kab mob thiab hauv cov nroj tsuag, tab sis Rubredoxin tshwm sim hauv cov kab mob thiab archaea.
Cov ntawv qhia hauv qab no qhia txog qhov sib txawv ntawm ferredoxin thiab Rubredoxin.
Summary – Ferredoxin vs Rubredoxin
Ferredoxin thiab Rubredoxin yog cov protein sib txuas uas muaj cov hlau thiab sulfur ua cov khoom. Qhov sib txawv tseem ceeb ntawm ferredoxin thiab Rubredoxin yog tias ferredoxin muaj peev xwm txo qis redox piv rau Rubredoxin.
