Compact archaeal variant of heme A synthase

Anna Lewin, Lars Hederstedt

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review


The N- and C-terminal halves of the heme A synthase polypeptide of Bacillus subtilis, and many other organisms, are homologous. This indicates that these enzyme proteins originate from a tandem duplication and fusion event of a gene encoding a protein half as large. The ape1694 gene of the hyperthermophilic archaeon Aeropyrum pernix encodes a protein that is similar to the hypothetical small primordial protein. We demonstrate that this A. pernix protein is a heat-stable membrane bound heme A synthase designated cCtaA. The case of cCtaA is unusual in evolution in that the primordial-like protein has not become extinct and apparently carries out the same function as the twice as large more diversified heme A synthase protein variant found in most cytochrome a-containing organisms.
Sidor (från-till)5351-5356
TidskriftFEBS Letters
StatusPublished - 2006

Ämnesklassifikation (UKÄ)

  • Biologiska vetenskaper


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