F
IPR016003

Photosystem II extrinsic protein V, cytochrome c-550 precursor-like

InterPro entry
Short namePsbV_cyt_c550-like
Overlapping
homologous
superfamilies
 
family relationships

Description

This entry represents a family of cytochrome c550 proteins mainly found in cyanobacteria and red algae.

Cytochromes c (cytC) can be defined as electron-transfer proteins having one or several haem c groups, bound to the protein by one or, more generally, two thioether bonds involving sulphydryl groups of cysteine residues. The fifth haem iron ligand is always provided by a histidine residue. CytC possess a wide range of properties and function in a large number of different redox processes.

Ambler
[1]
recognised four classes of cytC. Class 1 cytochromes have the haem-attachment site towards the N terminus, and can be further subdivided into five groups (1A to 1E) based on sequence similarity. Cytochrome C550 (CytC550) is a class 1A cytochrome. CytC550 (also known as Photosystem II extrinsic protein V, PsbV) is an extrinsic membrane protein that forms part of the oxygen-evolving complex in photosystem II, this complex being responsible for the splitting of water into O(2) and 4H+, the latter being used to reduce CO2 to glucose. CytC550 is only found in cyanobacteria and red algae
[2]
, this protein having been lost during the evolution of green plants
[4]
. Other Class 1A cytochrome C proteins include mitochondrial cytochrome C, which acts as an electron carrier between cytochrome reductase and the cytochrome oxidase complex, the final electron carrier in the mitochondrial electron transport chain; and cytochrome C6, which acts as an electron carrier between cytochrome b6f and photosystem I in cyanobacteria
[3]
.

References

1.Sequence variability in bacterial cytochromes c. Ambler RP. Biochim. Biophys. Acta 1058, 42-7, (1991). View articlePMID: 1646017

2.Structural characterization of photosystem II complex from red alga Porphyridium cruentum retaining extrinsic subunits of the oxygen-evolving complex. Bumba L, Havelkova-Dousova H, Husak M, Vacha F. Eur. J. Biochem. 271, 2967-75, (2004). View articlePMID: 15233792

3.Kinetics of interprotein electron transfer between cytochrome c6 and the soluble CuA domain of cyanobacterial cytochrome c oxidase. Paumann M, Feichtinger M, Bernroitner M, Goldfuhs J, Jakopitsch C, Furtmuller PG, Regelsberger G, Peschek GA, Obinger C. FEBS Lett. 576, 101-6, (2004). View articlePMID: 15474019

4.Homologs of plant PsbP and PsbQ proteins are necessary for regulation of photosystem ii activity in the cyanobacterium Synechocystis 6803. Thornton LE, Ohkawa H, Roose JL, Kashino Y, Keren N, Pakrasi HB. Plant Cell 16, 2164-75, (2004). View articlePMID: 15258264

GO terms

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