PROSITE documentation PDOC00464 [for PROSITE entry PS00537]
Cytochrome b559 subunits heme-binding site signature


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, α (gene psbE) and β (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.

Last update:

December 2004 / Pattern and text revised.


Technical section

PROSITE method (with tools and information) covered by this documentation:

CYTOCHROME_B559, PS00537; Cytochrome b559 subunits heme-binding site signature  (PATTERN)


1AuthorsPakrasi H.B. De Ciechi P. Whitmarsh J.
TitleSite directed mutagenesis of the heme axial ligands of cytochrome b559 affects the stability of the photosystem II complex.
SourceEMBO J. 10:1619-1627(1991).
PubMed ID1904816

PROSITE is copyrighted by the SIB Swiss Institute of Bioinformatics and distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives (CC BY-NC-ND 4.0) License, see prosite_license.html.


View entry in original PROSITE document format
View entry in raw text format (no links)