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MetaCyc Protein: PS I-LHCI supercomplex

Species: Chlamydomonas reinhardtii

Subunit composition of PS I-LHCI supercomplex = [(LHCA3)(LHCA2)][(LHCA4)(LHCA1)][(PsaO)(PsaN)(PsaL)(PsaK)(PsaJ)(PsaI)(PsaH)(PsaG)(PsaF)(PsaE)(PsaD)(PsaC)(PsaB)(PsaA)]
         LHCI-680 = (LHCA3)(LHCA2) (summary available)
                 Light-harvesting chlorophyll-a/b protein of photosystem I = LHCA3 (summary available)
                 Light-harvesting protein of photosystem I = LHCA2 (summary available)
         LHCI-705 = (LHCA4)(LHCA1) (summary available)
                 Light-harvesting protein of photosystem I = LHCA4 (summary available)
                 Light-harvesting protein of photosystem I = LHCA1 (summary available)
         photosystem I = (PsaO)(PsaN)(PsaL)(PsaK)(PsaJ)(PsaI)(PsaH)(PsaG)(PsaF)(PsaE)(PsaD)(PsaC)(PsaB)(PsaA) (extended summary available)
                 Photosystem I subunit O = PsaO (summary available)
                 Photosystem I reaction center subunit N = PsaN (summary available)
                 Photosystem I reaction center subunit XI = PsaL (summary available)
                 Photosystem I reaction center subunit psaK = PsaK (summary available)
                 Photosystem I reaction center subunit IX = PsaJ (summary available)
                 Photosystem I reaction centre, subunit VIII = PsaI (summary available)
                 Photosystem I reaction center subunit VI = PsaH (summary available)
                 Photosystem I reaction center subunit V = PsaG (summary available)
                 Photosystem I reaction center subunit III = PsaF (summary available)
                 Photosystem I reaction center subunit IV = PsaE (summary available)
                 Photosystem I reaction center subunit II = PsaD (summary available)
                 Photosystem I iron-sulfur center = PsaC (summary available)
                 Photosystem I P700 chlorophyll a apoprotein A2 = PsaB (summary available)
                 Photosystem I P700 chlorophyll a apoprotein A1 = PsaA (summary available)

Summary:
The core of the PS I-LHCI supercomplex is formed by the PsaA/B heterodimer with a few small subunits surrounding it, and this core contains all the components necessary for plastocyanin-ferredoxin oxidoreductase activity. All eukaryotic PSI cores characterized so far are monomers [Amunts07]. Except for a few chlorophylls required for the photochemistry, all chlorophylls bound in the core subunits function as light-harvesting pigments. Attached to the core are peripheral light-harvesting antennae composed of several LHCI proteins. Light energy captured by these light-harvesting chlorophylls is delivered to the P700 chlorophyll, where it is trapped as a stable charge separation. Chlamydomonas antenna is composed of LHCI-705 and LHCI-680 subcomplexes formed by Lhca1-4 polypeptides [Bassi92].

Citations: [Jun09]

Locations: chloroplast

Gene-Reaction Schematic: ?

GO Terms:

Cellular Component: GO:0009507 - chloroplast

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


Subunit of PS I-LHCI supercomplex: LHCI-680

Locations: chloroplast, chloroplast thylakoid membrane

GO Terms:

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

Summary:
LHCI-680 is a homo- or heterodimer of Lhca2 and/or Lhca3 with characteristic fluorescence peaks at 680 nm.

Citations: [Knoetzel92, Bassi92]


Subunit of LHCI-680: Light-harvesting chlorophyll-a/b protein of photosystem I

Gene: LHCA3 Accession Number: CHLREDRAFT_153678 (MetaCyc)

Locations: chloroplast

Molecular Weight: 32.59 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8JF10 , Protein Model Portal:A8JF10 , SMR:A8JF10 , String:3055.JGI153678 , UniProt:A8JF10

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

Summary:
The light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].


MapMan: 1.1.2.1 PS.lightreaction.photosystem I.LHC-I

Citations: [Merchant07]


Subunit of LHCI-680: Light-harvesting protein of photosystem I

Gene: LHCA2 Accession Number: CHLREDRAFT_144609 (MetaCyc)

Locations: chloroplast

Molecular Weight: 26.922 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8IKC8 , Protein Model Portal:A8IKC8 , UniProt:A8IKC8

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

Summary:
The light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].

Citations: [Merchant07]


Subunit of PS I-LHCI supercomplex: LHCI-705

Locations: chloroplast

GO Terms:

Cellular Component: GO:0009507 - chloroplast

Summary:
Heterodimer of Lhca1 and Lhac4 subunits with characteristic 77K fluorescence peaks at 705 nm

Citations: [Knoetzel92, Bassi92]


Subunit of LHCI-705: Light-harvesting protein of photosystem I

Gene: LHCA4 Accession Number: CHLREDRAFT_168073 (MetaCyc)

Locations: chloroplast

Molecular Weight: 28.43 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8I000 , Protein Model Portal:A8I000 , String:3055.JGI168073 , UniProt:A8I000

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

Summary:
LHC-IThe light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].


Subunit of LHCI-705: Light-harvesting protein of photosystem I

Gene: LHCA1 Accession Number: CHLREDRAFT_184471 (MetaCyc)

Locations: chloroplast

Molecular Weight: 24.91 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8J249 , Protein Model Portal:A8J249 , String:3055.JGI184471 , UniProt:A8J249

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

Summary:
The light harvesting antenna proteins LHC are pigment proteins that bind chlorophyll. They are adept at capturing light energy at different wavelengths and transferring it to the reaction centre of PSI. The PSI core uses this excitation energy for charge separation [Wientjes11].


Component enzyme of PS I-LHCI supercomplex : photosystem I

Catalyzes:
a reduced plastocyanin + an oxidized ferredoxin + hν → an oxidized plastocyanin + a reduced ferredoxin ,
2 NADP+[in] + 2 H+[in] + 4 e- → 2 NADPH[in]

Summary:
The function of PSI is to produce the NADPH necessary for the reduction of CO2 in the Calvin-Benson-Bassham cycle.

PSI is a multiprotein complex of up to 15 core subunits and is trimeric in cyanobacteria [Ozawa10]. In algae and higher plants the PSI core is associated with the peripheral light-harvesting antenna complex I (LHCI) that together form the PSI-LHCI supercomplex [Ozawa10]. PSI is associated with cofactors, such as chlorophyll, a, β carotene, lipid and iron sulfur clusters [Wicke11]. PSI uses solar energy to generate P700 [Webber01]. P700 is the primary electron donor that catalyzes electron transfer from plastocyanin or cytochrome c6 to the intermediate electron acceptors A0, A1 and FX [Sun99]. This culminates in the transfer of an electron to NADP+ to form NADPH via ferredoxin and the associated oxidoreductase.

P700 is a dimer of chlorophyll a and a' stabilized by PsaA and PsaB [Vassiliev95]. This forms the reaction center (RC) at the core of PSI. PsaF and PsaN are involved in docking plastocyanin or cytochrome c6 to the PSI complex and for efficient electron transfer to P700+ [Hippler97]. Two 4[FeS] clusters (FA and FB), the terminal electron acceptors bind to peripheral subunit PsaC, which together with PsaD and PsaE forms the docking site for ferredoxin to the PSI complex on the stromal side [Ozawa10].

PsaG, PsaH, and PsaN are special to eukaryotes and are involved in binding the light harvesting polypeptides. Some newly characterized accessory proteins Inner membrane ALBINO3-like protein 1 and Inner membrane ALBINO3-like protein 2 are crucial in mediating LHC protein integration into the thylakoid membrane [Gohre06].

Chaperone proteins that play a pivotal role in the stepwise integration of PSI subunits into a functional complex have recently been elucidated. These include chloroplast encoded Ycf4 and Ycf3, located in the thylakoid membrane that are required for a posttranslational step of PSI assembly [Albus10].


Subunit of photosystem I: Photosystem I subunit O

Gene: PsaO Accession Number: CHLREDRAFT_193847 (MetaCyc)

Locations: chloroplast

Molecular Weight: 13.74 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8JCL6 , String:3055.JGI193847 , UniProt:A8JCL6

Relationship Links: InterPro:IN-FAMILY:IPR017498

Summary:
PsaO is involved in balancing the excitation pressure between the two photosystems, forming a domain in PSI that is involved in the interaction with light-harvesting complex II [Jensen04].

Citations: [Merchant07]


Subunit of photosystem I: Photosystem I reaction center subunit N

Synonyms: PsaN

Gene: PsaN Accession Number: CHLREDRAFT_186531 (MetaCyc)

Locations: chloroplast thylakoid membrane

Molecular Weight: 14.8 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8I835 , Protein Model Portal:A8I835 , SMR:A8I835 , String:3055.JGI186531 , UniProt:A8I835 , UniProt:Q9AXJ2

Relationship Links: InterPro:IN-FAMILY:IPR008796 , Pfam:IN-FAMILY:PF05479

Summary:
PSI-N is the only subunit located exclusively on the lumenal side of PSI [Nielsen94].

It may function in mediating the binding of the antenna complexes to the PSI reaction center and core antenna. It does not bind pigments and plays an important role in docking plastocyanin to the PSI complex [Ihalainen02].


Subunit of photosystem I: Photosystem I reaction center subunit XI

Gene: PsaL Accession Number: CHLREDRAFT_205935 (MetaCyc)

Locations: chloroplast thylakoid membrane

Molecular Weight: 20.28 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:A8IL32 , Protein Model Portal:A8IL32 , SMR:A8IL32 , String:3055.JGI205935 , UniProt:A8IL32

Relationship Links: InterPro:IN-FAMILY:IPR003757 , Pfam:IN-FAMILY:PF02605 , ProDom:IN-FAMILY:PD005947

Summary:
PSI-L is involved stabilisation of PSI-H in eukaryotes. In transgenic plants when PSI-L is downregulated, there is a secondary loss of PSI-H [Ihalainen02]. PSI-L is involved in trimerization of PSI in cyanobacteria.


Subunit of photosystem I: Photosystem I reaction center subunit psaK

Synonyms: Light-harvesting complex I 8.4 kDa protein, P37 protein, PSI-K

Gene: PsaK Accession Number: CHLREDRAFT_192478 (MetaCyc)

Locations: chloroplast thylakoid membrane

Molecular Weight: 11.2 kD (from nucleotide sequence)

Molecular Weight: 8.4 kD (experimental)

GO Terms:

Cellular Component: GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Unification Links: GO:0009522 , Pride:P14225 , Protein Model Portal:P14225 , String:P14225 , UniProt:P14225

Relationship Links: InterPro:IN-FAMILY:IPR000549 , InterPro:IN-FAMILY:IPR017493 , InterPro:IN-FAMILY:IPR023618 , Pfam:IN-FAMILY:PF01241 , Prosite:IN-FAMILY:PS01026

Summary:
PsaK is located at the periphery of the PSI complex and contacts the membrane bilayer. It may be involved in the interaction of PSI with its external antenna system LHCI in higher plants [Ozawa10]. The protein coordinates two chlorophylls and interacts with carotenoids [Golbeck06].

Citations: [Merchant07, Franzen89]


Subunit of photosystem I: Photosystem I reaction center subunit IX

Synonyms: PsaJ

Gene: psaJ Accession Number: CHRECP061 (MetaCyc)

Locations: chloroplast

Sequence Length: 41 AAs

Molecular Weight: 4.74 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Protein Model Portal:P59777 , RefSeq:NP_958417.1 , SMR:P59777 , UniProt:P59777

Relationship Links: InterPro:IN-FAMILY:IPR002615 , Pfam:IN-FAMILY:PF01701 , ProDom:IN-FAMILY:PD004198

Summary:
PsaJ is located at the distal side of the PSI, with contacts to the membrane bilayer. It stabilizes the core antenna system of PSI and may also be involved in the interaction of PSI with its external antenna systems [Grotjohann05].

PsaJ is located in close vicinity to PsaF and spans the thylakoid membrane, with its N-terminus located in the stroma and the C-terminus in the lumen [Golbeck06].


MapMan: 1.1.2.2 PS.lightreaction.photosystem I.PSI polypeptide subunits

Citations: [Maul02]


Subunit of photosystem I: Photosystem I reaction centre, subunit VIII

Gene: PsaI Accession Number: CHLREDRAFT_144056 (MetaCyc)

Locations: chloroplast, chloroplast thylakoid lumen

Molecular Weight: 10.57 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0031977 - thylakoid lumen

MultiFun Terms: metabolism energy production/transport

Unification Links: KEGG:CHLREDRAFT_144056 , Protein Model Portal:A8IFG7 , SMR:A8IFG7 , String:3055.JGI144056 , UniProt:A8IFG7

Relationship Links: InterPro:IN-FAMILY:IPR001302 , Pfam:IN-FAMILY:PF00796 , ProDom:IN-FAMILY:PD003995

Summary:
PsaI is a small subunit of PS I containing one transmembrane helix and does not bind chlorophyll [Grotjohann05]. Instead it forms hydrophobic interactions with carotenoid molecules and may further stabilize the trimerization between PsaL and PsaM [Grotjohann05].

Citations: [Merchant07]


Subunit of photosystem I: Photosystem I reaction center subunit VI

Synonyms: Light-harvesting complex I 11 kDa protein, P28 protein

Gene: PsaH Accession Number: CHLREDRAFT_182959 (MetaCyc)

Locations: chloroplast, chloroplast thylakoid lumen

Molecular Weight: 14.15 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0031977 - thylakoid lumen

MultiFun Terms: metabolism energy production/transport

Unification Links: GO:0009538 , Pride:P13352 , Protein Model Portal:P13352 , String:P13352 , UniProt:P13352

Relationship Links: InterPro:IN-FAMILY:IPR004928 , Pfam:IN-FAMILY:PF03244

Summary:
Nuclear encoded PSI-H1 is essential for state transitions in photosynthesis, and is possibly involved in docking of the LHC I antenna complex to the core complex [Haldrup06].

Citations: [Merchant07, Franzen89]


Subunit of photosystem I: Photosystem I reaction center subunit V

Synonyms: Light-harvesting complex I 10 kDa protein, P35 protein, PSI-G

Gene: PsaG Accession Number: CHLREDRAFT_165416 (MetaCyc)

Locations: chloroplast, chloroplast thylakoid lumen

Molecular Weight: 13.22 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast
GO:0031977 - thylakoid lumen

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:P14224 , Protein Model Portal:P14224 , String:P14224 , UniProt:P14224

Relationship Links: InterPro:IN-FAMILY:IPR000549 , InterPro:IN-FAMILY:IPR017494 , InterPro:IN-FAMILY:IPR023618 , Pfam:IN-FAMILY:PF01241 , Prosite:IN-FAMILY:PS01026

Summary:
PSI-G is a subunit of photosystem I and is present in eukaryotes [Jensen02]. It is an integral membrane protein and together with PSI-K comprise the LHCI-binding proteins [Scheller01]. PSI-G is involved in binding to LHCI-680 and in the interaction between LHCI and the PSI core. It also plays a role in stabilizing the binding of the peripheral antenna and regulation of PSI [Moller05].

Citations: [Merchant07, Franzen89]


Subunit of photosystem I: Photosystem I reaction center subunit III

Synonyms: Light-harvesting complex I 17 kDa protein, P21 protein, PSI-F

Gene: PsaF Accession Number: CHLREDRAFT_130914 (MetaCyc)

Locations: chloroplast thylakoid lumen

Molecular Weight: 24.05 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0031977 - thylakoid lumen

MultiFun Terms: metabolism energy production/transport

Unification Links: DIP:DIP-34986N , KEGG:CHLREDRAFT_130914 , Pride:P12356 , Protein Model Portal:P12356 , SMR:P12356 , String:P12356 , UniProt:P12356

Relationship Links: InterPro:IN-FAMILY:IPR003666 , Pfam:IN-FAMILY:PF02507

Summary:
Nuclear encoded PSI-F is involved in docking of plastocyanin to PSI and may participate in electron donation from plastocyanin to P700 (or cytochrome c553 in algae and cyanobacteria).


Subunit of photosystem I: Photosystem I reaction center subunit IV

Synonyms: P30 protein, Photosystem I 8.1 kDa protein

Gene: PsaE Accession Number: CHLREDRAFT_76146 (MetaCyc)

Locations: chloroplast thylakoid membrane

Molecular Weight: 10.77 kD (from nucleotide sequence)

Molecular Weight: 8.1 kD (experimental)

GO Terms:

Cellular Component: GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:P12352 , Protein Model Portal:P12352 , SMR:P12352 , String:P12352 , UniProt:P12352

Relationship Links: InterPro:IN-FAMILY:IPR003375 , InterPro:IN-FAMILY:IPR008990 , Pfam:IN-FAMILY:PF02427 , ProDom:IN-FAMILY:PD004772

Summary:
Hydrophilic stromal PSI-E stabilizes the interaction between psaC and the PSI core, assists in the docking of ferredoxin to PSI and interacts with ferredoxin-NADP oxidoreductase. PSI-E is required for optimal electron transport to ferredoxin and flavodoxin [Rousseau93].


MapMan: 1.1.2.2 PS.lightreaction.photosystem I.PSI polypeptide subunits
Ortholog to Arabidopsis gene AT4G28750 (PsaE1)
ProMEX peptides

Citations: [Merchant07, Franzen89, Bellafiore02]


Subunit of photosystem I: Photosystem I reaction center subunit II

Synonyms: Photosystem I 20 kDa subunit

Gene: PsaD Accession Number: CHLREDRAFT_184971 (MetaCyc)

Locations: chloroplast thylakoid membrane

Molecular Weight: 21.34 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009535 - chloroplast thylakoid membrane

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:Q39615 , Protein Model Portal:Q39615 , SMR:Q39615 , String:3055.JGI184971 , UniProt:Q39615

Relationship Links: InterPro:IN-FAMILY:IPR003685 , Pfam:IN-FAMILY:PF02531

Summary:
PSI-D interacts strongly with and plays an important function in the docking of ferredoxin. The N-terminal domain of eukaryotic PSI-D is responsible for the tight binding of PSI-C that is characteristic of plant PSI [Scheller01].


Component enzyme of photosystem I : Photosystem I iron-sulfur center

Synonyms: PsaC

Gene: psaC Accession Number: CHRECP067 (MetaCyc)

Locations: chloroplast

Sequence Length: 81 AAs

Molecular Weight: 8.86 kD (from nucleotide sequence)

Molecular Weight: 9.0 kD (experimental)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:Q00914 , Protein Model Portal:Q00914 , RefSeq:NP_958423.1 , SMR:Q00914 , UniProt:Q00914

Relationship Links: InterPro:IN-FAMILY:IPR001450 , InterPro:IN-FAMILY:IPR017491 , InterPro:IN-FAMILY:IPR017896 , InterPro:IN-FAMILY:IPR017900 , Pfam:IN-FAMILY:PF12838 , Prosite:IN-FAMILY:PS00198 , Prosite:IN-FAMILY:PS51379

Catalyzes:
a reduced plastocyanin + an oxidized ferredoxin + hν → an oxidized plastocyanin + a reduced ferredoxin

Summary:
The chloroplast encoded gene psaC encodes a 2[4Fe-4S] bacterial ferredoxin type stromal subunit of photosystem I (PSI) [Fischer98]. It binds the two terminal electron acceptors FA and FB which are both [4Fe-4S] proteins [Fischer98][Fischer97]. The othermost iron-sulfur cluster of PsaC reduces soluble ferredoxin which binds to PSI via electrostatic interactions [Fischer99].


MapMan: 1.1.2.2 PS.lightreaction.photosystem I.PSI polypeptide subunits
ProMEX peptides

Citations: [Takahashi91, Takahashi96, Maul02]


Subunit of photosystem I: Photosystem I P700 chlorophyll a apoprotein A2

Synonyms: PsaB, PSI-B

Gene: psaB Accession Number: CHRECP048 (MetaCyc)

Locations: chloroplast

Sequence Length: 735 AAs

Molecular Weight: 82.1 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy production/transport

Unification Links: Pride:P09144 , Protein Model Portal:P09144 , RefSeq:NP_958404.1 , SMR:P09144 , UniProt:P09144

Relationship Links: InterPro:IN-FAMILY:IPR001280 , InterPro:IN-FAMILY:IPR006244 , InterPro:IN-FAMILY:IPR020586 , Pfam:IN-FAMILY:PF00223 , Prints:IN-FAMILY:PR00257 , Prosite:IN-FAMILY:PS00419

Summary:
PSI consists of a core complex that captures photons, and an electron transfer chain that converts photon excitation into a charge separation. This transfers an electron from the donor P700 to the acceptors A0, A1, FX, FA and FB in turn.

The subunits PSI-A and PSI-B binds to P700 at the reaction center, the heart of PSI [Scheller01]. The PSI-A/B heterodimer can be isolated as a complex known as chlorophyll a-complex 1 (CP1) and contains most of the pigments of PSI [Scheller01].


MapMan: 1.1.2.2 PS.lightreaction.photosystem I.PSI polypeptide subunits
ProMEX peptides

Citations: [Kuck87, Nozaki00, Dron82, Bingham91, Maul02, Rodday95, Webber96, Redding98, Krabben00, GuergovaKuras01, Nakamura03, Boudreaux01]


Subunit of photosystem I: Photosystem I P700 chlorophyll a apoprotein A1

Synonyms: PsaA

Gene: psaA Accession Number: CHRECP019 (MetaCyc)

Locations: chloroplast

Molecular Weight: 83.15 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0009507 - chloroplast

MultiFun Terms: metabolism energy metabolism, carbon

Unification Links: DIP:DIP-34985N , Pride:P12154 , Protein Model Portal:P12154 , RefSeq:NP_958375.1 , SMR:P12154 , UniProt:P12154

Relationship Links: InterPro:IN-FAMILY:IPR001280 , InterPro:IN-FAMILY:IPR006243 , InterPro:IN-FAMILY:IPR020586 , Pfam:IN-FAMILY:PF00223 , Prints:IN-FAMILY:PR00257 , Prosite:IN-FAMILY:PS00419

Summary:
PSI consists of a core complex that captures photons, and an electron transfer chain that converts photon excitation into a charge separation. This transfers an electron from the donor P700 to the acceptors A0, A1, FX, FA and FB in turn.

The subunits PSI-A and PSI-B binds to P700 at the reaction center, the heart of PSI [Scheller01]. The PSI-A/B heterodimer can be isolated as a complex known as chlorophyll a-complex 1 (CP1) and contains most of the pigments of PSI [Scheller01].


MapMan: 1.1.2.2 PS.lightreaction.photosystem I.PSI polypeptide subunits

Citations: [Maul02, Li04, Kuck87, Nozaki00, Redding98, Krabben00, GuergovaKuras01, Boudreaux01, Nakamura03]


References

Albus10: Albus CA, Ruf S, Schottler MA, Lein W, Kehr J, Bock R (2010). "Y3IP1, a nucleus-encoded thylakoid protein, cooperates with the plastid-encoded Ycf3 protein in photosystem I assembly of tobacco and Arabidopsis." Plant Cell 22(8);2838-55. PMID: 20807881

Amunts07: Amunts A, Drory O, Nelson N (2007). "The structure of a plant photosystem I supercomplex at 3.4 A resolution." Nature 447(7140);58-63. PMID: 17476261

Bassi92: Bassi R, Soen SY, Frank G, Zuber H, Rochaix JD (1992). "Characterization of chlorophyll a/b proteins of photosystem I from Chlamydomonas reinhardtii." J Biol Chem 267(36);25714-21. PMID: 1464588

Bellafiore02: Bellafiore S, Ferris P, Naver H, Gohre V, Rochaix JD (2002). "Loss of Albino3 leads to the specific depletion of the light-harvesting system." Plant Cell 14(9);2303-14. PMID: 12215522

Bingham91: Bingham SE, Xu RH, Webber AN (1991). "Transformation of chloroplasts with the psaB gene encoding a polypeptide of the photosystem I reaction center." FEBS Lett 292(1-2);137-40. PMID: 1959594

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
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