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. 1996 Jan;178(2):505–510. doi: 10.1128/jb.178.2.505-510.1996

Coenzyme F390 synthetase from Methanobacterium thermoautotrophicum Marburg belongs to the superfamily of adenylate-forming enzymes.

P Vermeij 1, R J van der Steen 1, J T Keltjens 1, G D Vogels 1, T Leisinger 1
PMCID: PMC177685  PMID: 8550473

Abstract

Depending on the reduction-oxidation state of the cell, some methanogenic bacteria synthesize or hydrolyze 8-hydroxyadenylylated coenzyme F420 (coenzyme F390). These two reactions are catalyzed by coenzyme F390 synthetase and hydrolase, respectively. To gain more insight into the mechanism of the former reaction, coenzyme F390 synthetase from Methanobacterium thermoautotrophicum Marburg was purified 89-fold from cell extract to a specific activity of 0.75 mumol.min-1.mg of protein-1. The monomeric enzyme consisted of a polypeptide with an apparent molecular mass of 41 kDa as determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. ftsA, the gene encoding coenzyme F390 synthetase, was cloned and sequenced. It encoded a protein of 377 amino acids with a predicted M(r) of 43,280. FtsA was found to be similar to domains found in the superfamily of peptide synthetases and adenylate-forming enzymes. FtsA was most similar to gramicidin S synthetase II (67% similarity in a 227-amino-acid region) and sigma-(L-alpha-aminoadipyl)-L-cysteine-D-valine synthetase (57% similarity in a 193-amino-acid region). Coenzyme F390 synthetase, however, holds an exceptional position in the superfamily of adenylate-forming enzymes in that it does not activate a carboxyl group of an amino or hydroxy acid but an aromatic hydroxyl group of coenzyme F420.

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Selected References

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