Abstract
ADP-forming acetyl-CoA synthetase (ACD), the novel enzyme of acetate formation and energy conservation in archaea Acety - CoA + ADP + Pi<==>acetate + ATP CoA), has been studied only in few hyperthermophilic euryarchaea. Here, we report the characterization of two ACDs with unique molecular and catalytic features, from the mesophilic euryarchaeon Haloarcula marismortui and from the hyperthermophilic crenarchaeon Pyrobaculum aerophilum. ACD from H. marismortui was purified and characterized as a salt-dependent, mesophilic ACD of homodimeric structure (166 kDa). The encoding gene was identified in the partially sequenced genome of H. marismortui and functionally expressed in Escherichia coli. The recombinant enzyme was reactivated from inclusion bodies following solubilization and refolding in the presence of salts. The ACD catalyzed the reversible ADP- and Pi-dependent conversion of acetyl-CoA to acetate. In addition to acetate, propionate, butyrate, and branched-chain acids (isobutyrate, isovalerate) were accepted as substrates, rather than the aromatic acids, phenylacetate and indol-3-acetate. In the genome of P. aerophilum, the ORFs PAE3250 and PAE 3249, which code for alpha and beta subunits of an ACD, overlap each other by 1...Continue Reading
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