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discounted EARLY registration ends Dec 31, 2014
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12/28 - 12/31
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Metabolic Modeling Tutorial
discounted EARLY registration ends Dec 31, 2014
BioCyc websites MAYBE down
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MetaCyc Polypeptide: Chlorophyll a-b binding protein of LHCII

Gene: LHCBM9 Accession Number: CHLREDRAFT_184479 (MetaCyc)

Synonyms: 184479, Major light-harvesting complex II protein m9

Species: Chlamydomonas reinhardtii

Component of: photosystem II (extended summary available)

Summary:
This cluster contains proteins similar to Lhcb1, 2 and 3, the main trimeric light-harvesting complex of PSII.

Citations: [Hankamer01]

Locations: chloroplast, chloroplast thylakoid membrane

Map Position: [666,428 <- 668,596]

Molecular Weight of Polypeptide: 27.07 kD (from nucleotide sequence)

Unification Links: Pride:Q8S3T9 , Protein Model Portal:Q8S3T9 , SMR:Q8S3T9 , UniProt:Q8S3T9

Relationship Links: InterPro:IN-FAMILY:IPR001344 , InterPro:IN-FAMILY:IPR022796 , InterPro:IN-FAMILY:IPR023329 , Panther:IN-FAMILY:PTHR21649 , Pfam:IN-FAMILY:PF00504

Gene-Reaction Schematic: ?

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Credits:
Revised 29-Apr-2011 by Weerasinghe D


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 [Hankamer01a].

Citations: [Jun09, Hankamer01]

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

Dey97: Dey, PM, Harborne, JB "Plant Biochemistry." Academic Press 1997.

Hankamer01: 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

Hankamer01a: 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

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

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 Thu Dec 25, 2014, BIOCYC13B.