The structural membrane control of the reduction of exogenous quinones catalysed by mitochondrial 2-methyl-1,4-naphthoquinone reductase
Konev, S.V.; Sukhodolets, I.G.; Volotovskiĭ, I.D.; Titovets, E.P.
Molekuliarnaia Biologiia 16(6): 1279-1283
1982
ISSN/ISBN: 0026-8984 PMID: 7155143 Document Number: 194832
The catalytic parameters of mitochondrial 2-methyl-1, 4-naphthoquinone-reductase were studied. Maximal velocity and Michaelis constant of quinone-reducing reaction were shown to depend strongly on the functional state of mitochondria (I, II and IV Chance's states). The changes in catalytic parameters were found for four quinone substrates essentially varying in their structures. For the same conditions the Michaelis constant of isolated enzyme remains unchanged. The data obtained indicate the possibility to control the activity and substrate specificity by structural rearrangements within the biological membrane.