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PDOC00475
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* Bacterioferritin signature *
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Bacterioferritin (BFR) [1,2] is a prokaryotic iron-storing protein that may
perform analogous functions in iron detoxification and storage as that of
eukaryotic ferritins. BFR is also known as cytochrome b-1, b-557, b-557.5, or
b-559 in various bacterial species.
BFR is an oligomer composed of 24 identical subunits that contains protoheme
IX in addition to the non-heme iron core. The two axial ligands for the heme
group iron have been shown [3] to be methionine residues. Although it is not
yet known which methionines are involved in the ligation, it has been proposed
that the initiator methionine (Met-1) and a C-terminal methionine (Met-144 in
Escherichia coli BFR) are good candidate for such ligands.
As a signature pattern we selected the conserved N-terminal extremity of BFR.
-Consensus pattern: <M-x-G-x(3)-V-[LIV]-x(2)-L-x-K
[M is a putative heme iron ligand]
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Last update: June 1992 / Pattern and text revised.
[ 1] Andrews S.C., Smith J.M.A., Guest J.R., Harrison P.M.
Biochem. Soc. Trans. 18:658-659(1990).
[ 2] Andrews S.C., Findlay J.B.C., Guest J.R., Harrison P.M., Keen J.N.,
Smith J.M.A.
Biochim. Biophys. Acta 1078:111-116(1991).
[ 3] Cheesman M.R., Thomson A.J., Greenwood C., Moore G.R., Kadir F.
Nature 346:771-773(1990).