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Abstract

This report summarizes the scientific results obtained by our group at the Institute of Botany of the University of Bologna (I) in a research program devoted to the elucidation of the photobiological hydrogen production by membrane fragments from the facultative photosynthetic bacterium Rhodopseudomonas capsulata. We concluded that the photoproduction of low reducing equivalents, which is a prerequisite for hydrogen evolution linked to nitrogen fixation in photosynthetic bacteria, is an energy demanding process correlated with the presence of the first site of phosphorylation, i.e. NADH dehydrogenase. Two ferredoxin like proteins at g=1.94 with Em-7.0 of -115mV and -370mV are involved in NAD**2+ photoreduction since R.capsulata M1, a respiratory mutant deficient in both photoreduction and oxidation of pyridin nucleotides, lacks these two iron - sulphur centres. The NAD**>f5<&< photoreduction in the presence of artificial redox mediators, e.g. TMPD, has also been analyzed.

Additional information

Authors: MELANDRI B A, UNIVERSITY OF BOLOGNA (ITALY);ZANNONI D, UNIVERSITY OF BOLOGNA (ITALY);CASADIO A, UNIVERSITY OF BOLOGNA (ITALY);DE SANTIS A UNIVERSITY OF BOLOGNA (ITALY), UNIVERSITY OF BOLOGNA (ITALY)
Bibliographic Reference: EUR 9683 EN (1985) MF, 50 P., BFR 150, BLOW-UP COPY BFR 250, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989123080000 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en