Journal Article

<i>Rhizobium leguminosarum</i> bv. viciae <i>hypA</i> gene is specifically expressed in pea (<i>Pisum sativum</i>) bacteroids and required for hydrogenase activity and processing

Yolanda Hernando, Jose Palacios, Juan Imperial and Tomás Ruiz-Argüeso

in FEMS Microbiology Letters

Volume 169, issue 2, pages 295-302
Published in print December 1998 |
Published online January 2006 | e-ISSN: 1574-6968 | DOI: http://dx.doi.org/10.1111/j.1574-6968.1998.tb13332.x

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Abstract

Rhizobium leguminosarum bv. viciae strain UPM791 induces in symbiosis with peas the synthesis of a nickel-containing hydrogenase which recycles the hydrogen evolved by nitrogenase. The genes required for synthesis of this hydrogenase, hupSLCDEFGHIJKhypABFCDEX, are clustered in the symbiotic plasmid. Analysis of a hypA-deficient mutant showed that HypA is essential for symbiotic hydrogenase activity and required for correct processing of the hydrogenase large subunit. Unlike other microoxically induced hyp genes, the hypA gene was only expressed in pea bacteroids from its own promoter. The hypA mRNA 5′ end was mapped 109 bp upstream of the translational start codon. This distinct pattern of expression suggests a different role for HypA and the remaining Hyp proteins in hydrogenase synthesis.

Keywords: Hydrogenase; Rhizobium; Symbiosis; hypA expression

Journal Article.  3631 words.  Illustrated.

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