Section 41
Chapter 40,677

Menaquinone function in the respiratory chain of Micrococcus lysodeikticus

Lukoianova, M.A.; Koroleva, V.V.

Biokhimiia 40(6): 1154-1162


ISSN/ISBN: 0320-9725
PMID: 1212458
Accession: 040676222

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Menaquinone-9 which is destructed under long-wave UV-irradiation is isolated from Micrococcus lysodeikticus membranes. NAD-H, malate and lactate oxidases are observed to be inhibited under irradiation, dehydrogenases of these substrates being almost intact. Photoinactivation of menaquinone results in the reduction of only one from two cytochromes b, presented in the membrane, thus testifying the location of menaquinone-9 between cytochromes b in the respiratory chain. Reconstruction of malate, NAD-H and lactate oxidases after irradiation took place when natural menaquinone (MQ-9) or menadione (MQ-0) were added. Detailed scheme of M. lysodeikticus respiratory chain is given.

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