{PDOC00464}
{PS00537; CYTOCHROME_B559}
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* Cytochrome b559 subunits heme-binding site signature *
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Cytochrome b559  [1]  is an essential component of photosystem II complex from
oxygenic photosynthetic  organisms.  It  is  an  integral  thylakoid  membrane
protein composed of two subunits, alpha (gene psbE) and beta (gene psbF), each
of which  contains  a histidine residue located in a transmembrane region. The
two histidines coordinate the heme iron of cytochrome b559.

The region around the heme-binding residue  of  both  subunits is very similar
and can be used as a signature pattern.

-Consensus pattern: [LIV]-x-[ST]-[LIVF]-R-[FYW]-x(2)-[IVL]-H-[STGAV]-[LIV]-
                    [STGA]-[IV]-P
                    [H is the 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: December 2004 / Pattern and text revised.

[ 1] Pakrasi H.B., De Ciechi P., Whitmarsh J.
     "Site directed mutagenesis of the heme axial ligands of cytochrome
     b559 affects the stability of the photosystem II complex."
     EMBO J. 10:1619-1627(1991).
     PubMed=1904816

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