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42  structures 993  species 6  interactions 2001  sequences 5  architectures

Family: Cytochrom_B559 (PF00283)

Summary: Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits

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Cytochrome b559 Edit Wikipedia article

Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits
PDB 2axt EBI.jpg
Structure of Photosystem II from Thermosynechococcus elongatus.[1]
Identifiers
Symbol Cytochrom_B559
Pfam PF00283
InterPro IPR013081
PROSITE PDOC00464
OPM superfamily 2
OPM protein 2axt
Lumenal portion of Cytochrome b559, alpha (gene psbE) subunit
PDB 1izl EBI.jpg
Structure of oxygen-evolving photosystem II from Thermosynechococcus vulcanus.[2]
Identifiers
Symbol Cytochrom_B559a
Pfam PF00284
InterPro IPR013082
PROSITE PDOC00464
OPM superfamily 2
OPM protein 2axt

Cytochrome b559 is an important component of Photosystem II.

PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic membrane.[3][4] Within the core of the complex, the chlorophyll and beta-carotene pigments are mainly bound to the antenna proteins CP43 (PsbC) and CP47 (PsbB), which pass the excitation energy on to chlorophylls in the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind all the redox-active cofactors involved in the energy conversion process. The PSII oxygen-evolving complex (OEC) provides electrons to re-reduce the PSII reaction center and oxidizes 2 water molecules to recover its reduced initial state. It consists of OEE1 (PsbO), OEE2 (PsbP) and OEE3 (PsbQ). The remaining subunits in PSII are of low molecular weight (less than 10 kDa), and are involved in PSII assembly, stabilisation, dimerisation, and photo-protection.[5]

Cytochrome b559, which forms part of the reaction centre core of PSII is a heterodimer composed of one alpha subunit (PsbE), one beta (PsbF) subunit, and a heme cofactor. Two histidine residues from each subunit coordinate the haem. Although cytochrome b559 is a redox-active protein, it is unlikely to be involved in the primary electron transport in PSII due to its very slow photo-oxidation and photo-reduction kinetics. Instead, cytochrome b559 could participate in a secondary electron transport pathway that helps protect PSII from photo-damage. Cytochrome b559 is essential for PSII assembly.[6]

This domain occurs in both the alpha and beta subunits of cytochrome B559. In the alpha sbunit it occurs together with a lumenal domain (IPR013082), while in the beta subunit it occurs on its own.

Cytochrome b559 can exist in three forms, each with a characteristic redox potential, These forms are very low potential (VLP), ≤ zero mV; low potential (LP) at 60 mV; and high potential (HP) at 370 mV. There is also an intermediate potential (IP) form that has a redox potential at pH 6.5-7.0 that ranges from 170 to 240 mV. In oxygen evolving reaction centers, more than half of the cyt b559 is in the HP form. In manganese depleted non oxygen evolving photosystem II reaction centers, cyt b559 is usually in the LP form.[7]

References[edit]

  1. ^ Loll B, Kern J, Saenger W, Zouni A, Biesiadka J (December 2005). "Towards complete cofactor arrangement in the 3.0 A resolution structure of photosystem II". Nature 438 (7070): 1040–4. doi:10.1038/nature04224. PMID 16355230. 
  2. ^ Kamiya N, Shen JR (January 2003). "Crystal structure of oxygen-evolving photosystem II from Thermosynechococcus vulcanus at 3.7-A resolution". Proc. Natl. Acad. Sci. U.S.A. 100 (1): 98–103. doi:10.1073/pnas.0135651100. PMC 140893. PMID 12518057. 
  3. ^ Kamiya N, Shen JR (2003). "Crystal structure of oxygen-evolving photosystem II from Thermosynechococcus vulcanus at 3.7-A resolution". Proc. Natl. Acad. Sci. U.S.A. 100 (1): 98–103. doi:10.1073/pnas.0135651100. PMC 140893. PMID 12518057. 
  4. ^ Blankenship RE, Raymond J (2004). "The evolutionary development of the protein complement of photosystem 2". Biochim. Biophys. Acta 1655 (1-3): 133–139. doi:10.1016/j.bbabio.2003.10.015. PMID 15100025. 
  5. ^ Schroder WP, Shi LX (2004). "The low molecular mass subunits of the photosynthetic supracomplex, photosystem II". Biochim. Biophys. Acta 1608 (2-3): 75–96. doi:10.1016/j.bbabio.2003.12.004. PMID 14871485. 
  6. ^ Burda K, Kruk J, Borgstadt R, Stanek J, StrzaBka K, Schmid GH, Kruse O (2003). "Mössbauer studies of the non-heme iron and cytochrome b559 in a Chlamydomonas reinhardtii PSI- mutant and their interactions with alpha-tocopherol quinone". FEBS Lett. 535 (1-3): 159–165. doi:10.1016/S0014-5793(02)03895-4. PMID 12560096. 
  7. ^ Mizusawa N, Yamashita T, Miyao M (1999). "Restoration of the high-potential form of cytochrome b559 of photosystem II occurs via a two-step mechanism under illumination in the presence of manganese ions". BBA 1410 (3): 273–286. doi:10.1016/S0005-2728(99)00005-5. PMID 10082793. 

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Cytochrome b559, alpha (gene psbE) and beta (gene psbF)subunits Provide feedback

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External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR013081

Oxygenic photosynthesis uses two multi-subunit photosystems (I and II) located in the cell membranes of cyanobacteria and in the thylakoid membranes of chloroplasts in plants and algae. Photosystem II (PSII) has a P680 reaction centre containing chlorophyll 'a' that uses light energy to carry out the oxidation (splitting) of water molecules, and to produce ATP via a proton pump. Photosystem I (PSI) has a P700 reaction centre containing chlorophyll that takes the electron and associated hydrogen donated from PSII to reduce NADP+ to NADPH. Both ATP and NADPH are subsequently used in the light-independent reactions to convert carbon dioxide to glucose using the hydrogen atom extracted from water by PSII, releasing oxygen as a by-product.

PSII is a multisubunit protein-pigment complex containing polypeptides both intrinsic and extrinsic to the photosynthetic membrane [PUBMED:12518057, PUBMED:15100025]. Within the core of the complex, the chlorophyll and beta-carotene pigments are mainly bound to the antenna proteins CP43 (PsbC) and CP47 (PsbB), which pass the excitation energy on to the reaction centre proteins D1 (Qb, PsbA) and D2 (Qa, PsbD) that bind all the redox-active cofactors involved in the energy conversion process. The PSII oxygen-evolving complex (OEC) oxidises water to provide protons for use by PSI, and consists of OEE1 (PsbO), OEE2 (PsbP) and OEE3 (PsbQ). The remaining subunits in PSII are of low molecular weight (less than 10 kDa), and are involved in PSII assembly, stabilisation, dimerisation, and photo-protection [PUBMED:14871485].

Cytochrome b559, which forms part of the reaction centre core of PSII is a heterodimer composed of one alpha subunit (PsbE), one beta (PsbF) subunit, and a haem cofactor. Two histidine residues from each subunit coordinate the haem. Although cytochrome b559 is a redox-active protein, it is unlikely to be involved in the primary electron transport in PSII due to its very slow photo-oxidation and photo-reduction kinetics. Instead, cytochrome b559 could participate in a secondary electron transport pathway that helps protect PSII from photo-damage. Cytochrome b559 is essential for PSII assembly [PUBMED:12560096].

This domain occurs in both the alpha and beta subunits of cytochrome B559. In the alpha sbunit it occurs together with a lumenal domain (INTERPRO), while in the beta subunit it occurs on its own.

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(8)
Full
(2001)
Representative proteomes NCBI
(639)
Meta
(147)
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(28)
RP35
(71)
RP55
(99)
RP75
(112)
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  Seed
(8)
Full
(2001)
Representative proteomes NCBI
(639)
Meta
(147)
RP15
(28)
RP35
(71)
RP55
(99)
RP75
(112)
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  Seed
(8)
Full
(2001)
Representative proteomes NCBI
(639)
Meta
(147)
RP15
(28)
RP35
(71)
RP55
(99)
RP75
(112)
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You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

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Seed source: Prosite
Previous IDs: cytochr_b559;
Type: Family
Author: Finn RD
Number in seed: 8
Number in full: 2001
Average length of the domain: 28.50 aa
Average identity of full alignment: 55 %
Average coverage of the sequence by the domain: 47.05 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 29.5 29.5
Trusted cut-off 30.7 30.3
Noise cut-off 29.4 29.4
Model length: 29
Family (HMM) version: 14
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Interactions

There are 6 interactions for this family. More...

PsbX Photo_RC PsbJ Cytochrom_B559a PsbH Cytochrom_B559

Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Cytochrom_B559 domain has been found. There are 42 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.

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