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MetaCyc Polypeptide: Oxygen-evolving enhancer protein 2 of photosystem II

Gene: PSBP1 Accession Number: CHLREDRAFT_33411 (MetaCyc)

Synonyms: 33411

Species: Chlamydomonas reinhardtii

Component of:
OEC complex (summary available)
photosystem II (extended summary available)

Summary:
The oxygen-evolving enhancer protein 2 (OEE2) and PSII core constitute the oxygen evolving complex. It has been shown that OEE2 is absolutely required for oxygen evolution at high levels [Mayfield87]. It binds to the lumenal side of the PSII complex.

Citations: [Merchant07]

Locations: chloroplast, chloroplast thylakoid membrane, chloroplast stroma, chloroplast thylakoid lumen

Map Position: [1,227,522 <- 1,229,715]

Molecular Weight of Polypeptide: 29.9 kD (from nucleotide sequence), 23.0 kD (experimental)

Unification Links: Pride:A8IYH9 , Protein Model Portal:A8IYH9 , String:3055.JGI33411 , UniProt:A8IYH9

Relationship Links: InterPro:IN-FAMILY:IPR002683 , InterPro:IN-FAMILY:IPR016123 , Pfam:IN-FAMILY:PF01789

Gene-Reaction Schematic: ?

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0009535 - chloroplast thylakoid membrane
GO:0009543 - chloroplast thylakoid lumen
GO:0009570 - chloroplast stroma

MultiFun Terms: metabolism

Credits:
Revised 29-Apr-2011 by Weerasinghe D


Subunit of: OEC complex

Species: Chlamydomonas reinhardtii

Subunit composition of OEC complex = [PSBQ][PSBP1][PSBO]
         Oxygen-evolving enhancer protein 3 = PSBQ (summary available)
         Oxygen-evolving enhancer protein 2 of photosystem II = PSBP1 (summary available)
         Oxygen-evolving enhancer protein 1 = PSBO (summary available)

Component of: photosystem II (extended summary available)

Summary:
The OEC (oxygen evolving complex) of higher plants PS II contains three extrinsic, nucleus-encoded subunits, PsbO, Q, and P. The OEC complex is attached to the luminal side of PS II and protects CaMn4 cluster bound to D1 and CP43 proteins [Ferreira04]. Contrary to the membrane-embedded PS II core polypeptides that are subject to rapid degradation when not assembled, a pool of free, assembly-competent OEC proteins has been shown to exist in the thylakoid lumen [Hashimoto97a].

Locations: chloroplast thylakoid membrane, chloroplast

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0042651 - thylakoid membrane

Credits:
Created 12-Jan-2010 by May P , MPI-MP


Subunit of: photosystem II

Synonyms: PSII complex, PSII-LHCII supercomplex

Species: Chlamydomonas reinhardtii

Subunit composition of photosystem II = [LHCBM9][LHCBM8][LHCBM7][LHCBM6][LHCBM5][LHCBM4][LHCBM3][LHCBM2][LHCBM1][LHCB5][LHCB4][(PSBQ)(PSBP1)(PSBO)][([(PsbK)(PsbC)([PsbT][PsbR][PsbM][PsbL][PsbJ][PsbH][(PsbB)([PsbA][(PsbE)(PsbD)])])][PSBW][PsbZ][PSBO])2]
         Chlorophyll a-b binding protein of LHCII = LHCBM9 (summary available)
         Chlorophyll a-b binding protein of LHCII = LHCBM8 (summary available)
         Major light-harvesting complex II protein m7 = LHCBM7 (summary available)
         Chloropyll a-b binding protein of LHCII type I = LHCBM6 (summary available)
         Chlorophyll a-b binding protein of LHCII = LHCBM5 (summary available)
         Chloropyll a-b binding protein of LHCII = LHCBM4 (summary available)
         Light-harvesting chlorophyll-a/b binding protein LhcII-1.3 = LHCBM3 (summary available)
         Light-harvesting chlorophyll-a/b binding protein LhcII-3 = LHCBM2 (summary available)
         Chlorophyll a-b binding protein of LHCII = LHCBM1 (summary available)
         CP26 = LHCB5 (summary available)
         Chlorophyll a-b binding protein CP29 = LHCB4 (summary available)
         OEC complex = (PSBQ)(PSBP1)(PSBO) (summary available)
                 Oxygen-evolving enhancer protein 3 = PSBQ (summary available)
                 Oxygen-evolving enhancer protein 2 of photosystem II = PSBP1 (summary available)
                 Oxygen-evolving enhancer protein 1 = PSBO (summary available)
         PS II core dimer = ([(PsbK)(PsbC)([PsbT][PsbR][PsbM][PsbL][PsbJ][PsbH][(PsbB)([PsbA][(PsbE)(PsbD)])])][PSBW][PsbZ][PSBO])2 (extended summary available)
                 PS II core monomer (complete) = ([PsbK][PsbC][(PsbT)(PsbR)(PsbM)(PsbL)(PsbJ)(PsbH)([PsbB][(PsbA)([PsbE][PsbD])])])(PSBW)(PsbZ)(PSBO)
                         PS II core monomer = (PsbK)(PsbC)([PsbT][PsbR][PsbM][PsbL][PsbJ][PsbH][(PsbB)([PsbA][(PsbE)(PsbD)])]) (summary available)
                                 Photosystem II reaction center protein K = PsbK (summary available)
                                 CP43 = PsbC (summary available)
                                 CP43-less PS II core monomer = (PsbT)(PsbR)(PsbM)(PsbL)(PsbJ)(PsbH)([PsbB][(PsbA)([PsbE][PsbD])]) (summary available)
                                         Photosystem II reaction center protein T = PsbT (summary available)
                                         10 kDa photosystem II polypeptide = PsbR (summary available)
                                         Photosystem II reaction center protein M = PsbM
                                         Photosystem II reaction center protein L = PsbL
                                         Photosystem II reaction center protein J = PsbJ (summary available)
                                         Photosystem II reaction center protein H = PsbH
                                         PS II RC - CP47 complex = (PsbB)([PsbA][(PsbE)(PsbD)]) (summary available)
                                                 Photosystem II CP47 chlorophyll apoprotein = PsbB (summary available)
                                                 PS II RC = (PsbA)([PsbE][PsbD])
                                                         Photosystem Q(B) protein = PsbA (summary available)
                                                         cytb559-D2 complex = (PsbE)(PsbD) (summary available)
                                                                 cytochrome b-559 α-subunit = PsbE (summary available)
                                                                 Photosystem II D2 protein = PsbD (summary available)
                         Photosystem II reaction center W protein = PSBW
                         Photosystem II reaction center protein Z = PsbZ (summary available)
                         Oxygen-evolving enhancer protein 1 = PSBO (summary available)

Summary:
The process of photosynthesis which is central to the presence of life on earth involves the interplay of several reactions. Chloroplasts are the pivotal organelles in this process and they are highly compartmentalized for this function which is mediated by three light dependet complexes. Photosystem I (PSI), photosystem II (PSII), and the cytochrome b6f complex are the three light-dependent complexes, located in the thylakoid membranes, a detailed network of flattened vesicles [Uniacke07].

Photosystem II is a water oxidizing multisubunit protein complex [Barber02]. A cluster of four manganese atoms bound to the lumenal surface of the complex catalyzes the water oxidizing reaction which is powered by solar energy. The Mn cluster is sequentially oxidized by P680 and a chlorophyll a molecule that acts as the primary electron donor, with pheophytin acting as the primary electron acceptor [Allakhverdiev11]. All these redox active components of PSII are bound to the two structurally related proteins known as D1 and D2. Associated with the D1/D2 heterodimer are two chlorophyll proteins CP43 and CP47 and at least three extrinsic proteins that protect and optimize the activity of the Mn cluster [Buchel99]. These proteins, cytochrome b559 and some other subunits make up the core complex [Hankamer01].

Citations: [Jun09, Hankamer01a]

Locations: chloroplast thylakoid membrane, chloroplast

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0042651 - thylakoid membrane

Credits:
Created 12-Jan-2010 by May P , MPI-MP
Revised 17-May-2011 by Weerasinghe D


Enzymatic reaction of: photosystem II

EC Number: 1.10.3.9

4 hν + 2 a plastoquinone + 2 H2O <=> 2 a plastoquinol + oxygen

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

The reaction is physiologically favored in the direction shown.

In Pathways: photosynthesis light reactions , hydrogen production VIII

Exons/Introns:


References

Allakhverdiev11: Allakhverdiev SI, Tsuchiya T, Watabe K, Kojima A, Los DA, Tomo T, Klimov VV, Mimuro M (2011). "Redox potentials of primary electron acceptor quinone molecule (QA)- and conserved energetics of photosystem II in cyanobacteria with chlorophyll a and chlorophyll d." Proc Natl Acad Sci U S A 108(19);8054-8. PMID: 21521792

Barber02: Barber J (2002). "Photosystem II: a multisubunit membrane protein that oxidises water." Curr Opin Struct Biol 12(4);523-30. PMID: 12163077

Buchel99: Buchel C, Barber J, Ananyev G, Eshaghi S, Watt R, Dismukes C (1999). "Photoassembly of the manganese cluster and oxygen evolution from monomeric and dimeric CP47 reaction center photosystem II complexes." Proc Natl Acad Sci U S A 96(25);14288-93. PMID: 10588698

Dey97a: Dey, PM, Harborne, JB "Plant Biochemistry." Academic Press 1997.

Ferreira04: Ferreira KN, Iverson TM, Maghlaoui K, Barber J, Iwata S (2004). "Architecture of the photosynthetic oxygen-evolving center." Science 303(5665);1831-8. PMID: 14764885

Hankamer01: Hankamer B, Morris E, Nield J, Gerle C, Barber J (2001). "Three-dimensional structure of the photosystem II core dimer of higher plants determined by electron microscopy." J Struct Biol 135(3);262-9. PMID: 11722166

Hankamer01a: Hankamer B, Morris E, Nield J, Carne A, Barber J (2001). "Subunit positioning and transmembrane helix organisation in the core dimer of photosystem II." FEBS Lett 504(3);142-51. PMID: 11532446

Hashimoto97a: Hashimoto A, Ettinger WF, Yamamoto Y, Theg SM (1997). "Assembly of Newly Imported Oxygen-Evolving Complex Subunits in Isolated Chloroplasts: Sites of Assembly and Mechanism of Binding." Plant Cell 9(3);441-452. PMID: 12237359

Jun09: Jun Minagawa (2009). "Light-Harvesting Proteins." Chapter 14. In: The Chlamydomonas Sourcebook. Second Edition.

Mayfield87: Mayfield SP, Rahire M, Frank G, Zuber H, Rochaix JD (1987). "Expression of the nuclear gene encoding oxygen-evolving enhancer protein 2 is required for high levels of photosynthetic oxygen evolution in Chlamydomonas reinhardtii." Proc Natl Acad Sci U S A 84(3);749-53. PMID: 3468511

Merchant07: Merchant SS, Prochnik SE, Vallon O, Harris EH, Karpowicz SJ, Witman GB, Terry A, Salamov A, Fritz-Laylin LK, Marechal-Drouard L, Marshall WF, Qu LH, Nelson DR, Sanderfoot AA, Spalding MH, Kapitonov VV, Ren Q, Ferris P, Lindquist E, Shapiro H, Lucas SM, Grimwood J, Schmutz J, Cardol P, Cerutti H, Chanfreau G, Chen CL, Cognat V, Croft MT, Dent R, Dutcher S, Fernandez E, Fukuzawa H, Gonzalez-Ballester D, Gonzalez-Halphen D, Hallmann A, Hanikenne M, Hippler M, Inwood W, Jabbari K, Kalanon M, Kuras R, Lefebvre PA, Lemaire SD, Lobanov AV, Lohr M, Manuell A, Meier I, Mets L, Mittag M, Mittelmeier T, Moroney JV, Moseley J, Napoli C, Nedelcu AM, Niyogi K, Novoselov SV, Paulsen IT, Pazour G, Purton S, Ral JP, Riano-Pachon DM, Riekhof W, Rymarquis L, Schroda M, Stern D, Umen J, Willows R, Wilson N, Zimmer SL, Allmer J, Balk J, Bisova K, Chen CJ, Elias M, Gendler K, Hauser C, Lamb MR, Ledford H, Long JC, Minagawa J, Page MD, Pan J, Pootakham W, Roje S, Rose A, Stahlberg E, Terauchi AM, Yang P, Ball S, Bowler C, Dieckmann CL, Gladyshev VN, Green P, Jorgensen R, Mayfield S, Mueller-Roeber B, Rajamani S, Sayre RT, Brokstein P, Dubchak I, Goodstein D, Hornick L, Huang YW, Jhaveri J, Luo Y, Martinez D, Ngau WC, Otillar B, Poliakov A, Porter A, Szajkowski L, Werner G, Zhou K, Grigoriev IV, Rokhsar DS, Grossman AR (2007). "The Chlamydomonas genome reveals the evolution of key animal and plant functions." Science 318(5848);245-50. PMID: 17932292

Uniacke07: Uniacke J, Zerges W (2007). "Photosystem II assembly and repair are differentially localized in Chlamydomonas." Plant Cell 19(11);3640-54. PMID: 18055604


Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 18.5 on Sat Nov 22, 2014, BIOCYC14A.