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J. Bacteriol., 05 1995, 2628-2636, Vol 177, No. 10
S Malki, I Saimmaime, G De Luca, M Rousset, Z Dermoun and JP Belaich
A genomic DNA fragment from Desulfovibrio fructosovorans, which strongly
hybridized with the hydAB genes from Desulfovibrio vulgaris Hildenborough,
was cloned and sequenced. This fragment was found to contain four genes,
named hndA, hndB, hndC, and hndD. Analysis of the sequence homologies
indicated that HndA shows 29, 21, and 26% identity with the 24-kDa subunit
from Bos taurus complex I, the 25-kDa subunit from Paracoccus denitrificans
NADH dehydrogenase type I, and the N- terminal domain of HoxF subunit of
the NAD-reducing hydrogenase from Alcaligenes eutrophus, respectively. HndB
does not show any significant homology with any known protein. HndC shows
37 and 33% identity with the C-terminal domain of HoxF and the 51-kDa
subunit from B. taurus complex I, respectively, and has the requisite
structural features to be able to bind one flavin mononucleotide, one NAD,
and three [4Fe-4S] clusters. HndD has 40, 42, and 48% identity with
hydrogenase I from Clostridium pasteurianum and HydC and HydA from D.
vulgaris Hildenborough, respectively. The 4.5-kb length of the transcripts
expressed in D. fructosovorans and in Escherichia coli (pSS13) indicated
that all four genes were present on the same transcription unit. The sizes
of the four polypeptides were measured by performing heterologous
expression of hndABCD in E. coli, using the T7 promoter/polymerase system.
The products of hndA, hndB, hndC, and hndD were 18.8, 13.8, 52, and 63.4
kDa, respectively. One hndC deletion mutant, called SM3, was constructed by
performing marker exchange mutagenesis.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Characterization of an operon encoding an NADP-reducing hydrogenase in Desulfovibrio fructosovorans
Centre National de la Recherche Scientifique, Marseilles, France.
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