Component A3 of the methylcoenzyme M methylreductase system of Methanobacterium thermoautotrophicum delta H: resolution into two components.
Component A3 of the methylcoenzyme M methylreductase system of Methanobacterium thermoautotrophicum (strain delta H) has been resolved into two fractions. One, named component A3a, was defined as the fraction required along with components A2 and C to produce methane from 2-(methylthio)ethanesulfonate when titanium(III) citrate was used as the sole source of electrons. The second one, named component A3b, was required when H2 and 7-mercapto-N-heptanoyl-O-phospho-L-threonine were provided as the dual source of electrons. Component A3a was a large iron-sulfur protein aggregate (Mr 500,000) and is most likely involved in providing electrons at a low potential for the reductive activation of component C.
Department of Microbiology, University of Illinois, Urbana 61801.
P E
PE
Rouvière
R S
RS
Wolfe
D000693:Anaerobiosis; D002850:Chromatography, Gel / Q000379:methods; D019605:Euryarchaeota / Q000201:enzymology*; D007700:Kinetics; D008970:Molecular Weight; D009097:Multienzyme Complexes / Q000302:isolation & purification* / Q000378:metabolism; D010088:Oxidoreductases / Q000302:isolation & purification* / Q000378:metabolism
D009097:Multienzyme Complexes; D010088:Oxidoreductases; C023895:methyl coenzyme M methylreductase