Frank Müh, A. Zouni,
"Cytochrome b 559 in Photosystem II"
, in William A. Kramer, Toivo Kallas: Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling, in Bookchapter, Serie Advances in Photosynthesis and Respiration, Vol. 41, Springer Netherlands, Seite(n) 143-175, 2016, ISBN: 978-94-017-7479-6, ISSN: 1572-0233
Cytochrome b 559 in Photosystem II
Sprache des Titels:
Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling
The photosystem II core complex (PSIIcc) is a complicated membrane protein occurring in oxygenic photosynthetic organisms that catalyzes a key reaction, the light-induced oxidation of water. It consists of 17 membrane-spanning ?-helical and three membrane-extrinsic protein subunits and binds nearly 100 cofactors. Among them is a heme protein composed of one heme b group ligated by two low molecular weight subunits with one transmembrane helix each, referred to as cytochrome (cyt) b 559. Despite extensive research, the role of cyt b 559 in PSIIcc is still not known. In the present chapter, the structure of cyt b 559 is reviewed based on recent crystallographic work together with its unusually complex redox behavior, and some ideas are discussed concerning a possible function of this unique heme protein.