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. 1997 Jan;179(1):290–292. doi: 10.1128/jb.179.1.290-292.1997

HupUV proteins of Rhodobacter capsulatus can bind H2: evidence from the H-D exchange reaction.

P M Vignais 1, B Dimon 1, N A Zorin 1, A Colbeau 1, S Elsen 1
PMCID: PMC178694  PMID: 8982013

Abstract

The H-D exchange reaction has been measured with the D2-H2O system, for Rhodobacter capsulatus JP91, which lacks the hupSL-encoded hydrogenase, and R. capsulatus BSE16, which lacks the HupUV proteins. The hupUV gene products, expressed from plasmid pAC206, are shown to catalyze an H-D exchange reaction distinguishable from the H-D exchange due to the membrane-bound, hupSL-encoded hydrogenase. In the presence of O2, the uptake hydrogenase of BSE16 cells catalyzed a rapid uptake and oxidation of H2, D2, and HD present in the system, and its activity (H-D exchange, H2 evolution in presence of reduced methyl viologen [MV+]) depended on the external pH, while the H-D exchange due to HupUV remained insensitive to external pH and O2. These data suggest that the HupSL dimer is periplasmically oriented, while the HupUV proteins are in the cytoplasmic compartment.

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Selected References

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