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MetaCyc Enzyme: photosystem I

Synonyms: photosystem I trimer complex

Species: Synechocystis sp. PCC 6803

Subunit composition of photosystem I = [([PsaA][PsaB])(PsaC)(PsaD)(PsaE)(PsaF)(PsaL)(PsaJ)(PsaK1)(PsaL)(PsaM)(PsaK2)]3
         photosystem I complex = ([PsaA][PsaB])(PsaC)(PsaD)(PsaE)(PsaF)(PsaL)(PsaJ)(PsaK1)(PsaL)(PsaM)(PsaK2)
                 P700 protein = (PsaA)(PsaB) (summary available)
                         Photosystem I P700 chlorophyll a apoprotein A1 = PsaA (summary available)
                         Photosystem I P700 chlorophyll a apoprotein A2 = PsaB (summary available)
                 Photosystem I iron-sulfur center = PsaC (summary available)
                 Photosystem I reaction center subunit II = PsaD (summary available)
                 Photosystem I reaction center subunit IV = PsaE (summary available)
                 Photosystem I reaction center subunit III = PsaF (summary available)
                 Photosystem I reaction center subunit VIII = PsaL (summary available)
                 Photosystem I reaction center subunit IX = PsaJ (summary available)
                 Photosystem I reaction center subunit PsaK 1 = PsaK1 (summary available)
                 Photosystem I reaction center subunit XI = PsaL (summary available)
                 Photosystem I reaction center subunit XII = PsaM (summary available)
                 Photosystem I reaction center subunit PsaK 2 = PsaK2 (summary available)

Summary:
Photosystem I (PS I) is a large membrane protein complex that catalyzes the light driven electron transfer from plastocyanin, which is located on the inside of the thylakoids (the lumen), to ferredoxin, which is on the stromal side of the membrane.

Cyanobacterial PS I can exist in both trimeric and monomeric forms. The trimeric form has been shown to be the prominent oligomeric state at low light intensity. The monomeric unit of PSI from Synechocystis sp. PCC 6803 consists of 11 protein subunits, to which 127 cofactors are non-covalently bound. The 12 proteins are Photosystem I P700 chlorophyll a apoprotein A1, Photosystem I P700 chlorophyll a apoprotein A2, Photosystem I iron-sulfur center, Photosystem I reaction center subunit II, Photosystem I reaction center subunit IV, Photosystem I reaction center subunit III, Photosystem I reaction center subunit IX, Photosystem I reaction center subunit IX, Photosystem I reaction center subunit PsaK 1, Photosystem I reaction center subunit XI, Photosystem I reaction center subunit XII. Some thermophilic cyanobacteria may contain an additional subunit, PsaX.

The processes catalyzed by Photosystem I can be divided into:

1. light capturing and excitation energy transfer

2. electron transfer.

The light capturing is performed by the large antenna system that consists of 90 antenna chlorophylls and 22 carotenoids. The excitation energy is transferred to the center of the complex, where the electron transport chain is located. The electron transport chain consists of six chlorophylls, two phylloquinones and three 4Fe4S clusters.

The charge separation is initiated from the P700 protein, the electron donor, which consists of a heterodimer of a chlorophyll a and a chlorophyll a' (the C13 epimer of chlorophyll a). From P700, the electron is transferred stepwise to A (a chlorophyll a molecule), A0 (also a chlorophyll a molecule), A1 (a phylloquinone molecule) and from there subsequently to the three a [4Fe-4S] iron-sulfur cluster, named FX, FA and FB. After the docking of ferredoxin, the electron is transferred from the terminal 4Fe4S cluster of PS I, FB, to the 2Fe2S cluster of ferredoxin, which transfers the electron to the ferredoxin-NADP oxidoreductase, where NADP+ is finally reduced to NADPH. Under conditions of iron limitation, a flavodoxin may replace the ferredoxin [Grotjohann05].

P700 is re-reduced with the electrons delivered from photosystem II by plastocyanin.

Gene-Reaction Schematic: ?

Credits:
Created 04-Jan-1999 by Zhang P , TAIR
Revised 23-May-2008 by Caspi R , SRI International


Enzymatic reaction of: photosystem I

EC Number: 1.97.1.12

a reduced plastocyanin + an oxidized ferredoxin + hν <=> an oxidized plastocyanin + a reduced ferredoxin

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 favored in the direction shown.

In Pathways: ethylene biosynthesis V (engineered) , photosynthetic 3-hydroxybutyrate biosynthesis (engineered) , oxygenic photosynthesis , photosynthesis light reactions


Subunit of photosystem I: photosystem I complex


Subunit of photosystem I complex: P700 protein

Summary:
The PsaA/PsaB heterodimer contains the primary electron donor P700 and the electron acceptors A0, A1 and FX. It also binds about 100-130 antenna chlorophyll molecules. P700 is a chlorophyll dimer, A0 a chlorophyll monomer, A1 a phylloquinone and FX a 4Fe-4S cluster. [Kruip93, Kruip97]


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

Synonyms: PsaA

Gene: psaA Accession Number: G-416 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 82.95 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:slr1834 , Protein Model Portal:P29254 , SMR:P29254 , String:1148.slr1834 , UniProt:P29254

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].

Citations: [Smart91, Sun97a, Nakamura03]


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

Synonyms: PsaB

Gene: psaB Accession Number: G-415 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 81.29 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:slr1835 , Protein Model Portal:P29255 , SMR:P29255 , String:1148.slr1835 , UniProt:P29255

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].


Subunit of photosystem I complex: Photosystem I iron-sulfur center

Synonyms: photosystem I subunit VII, PsaC, 9 kD polypeptide, PSI-C

Gene: psaC Accession Number: G-414 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 8.82 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:ssl0563 , Protein Model Portal:P32422 , SMR:P32422 , String:1148.ssl0563 , UniProt:P32422

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

Summary:
The gene psaC encodes a 2[4Fe-4S] bacterial ferredoxin type stromal subunit of photosystem I (PSI) [Fischer98a]. It binds the two terminal electron acceptors FA and FB which are both [4Fe-4S] proteins [Fischer98a][Fischer97]. The othermost iron-sulfur cluster of PsaC reduces soluble ferredoxin which binds to PSI via electrostatic interactions [Fischer99].

Citations: [Kaneko96, Jung97, Yu95]


Subunit of photosystem I complex: Photosystem I reaction center subunit II

Synonyms: PsaD, Photosystem I 16 kDa polypeptide

Gene: psaD Accession Number: G-413 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 15.64 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:slr0737 , Protein Model Portal:P19569 , SMR:P19569 , String:1148.slr0737 , UniProt:P19569

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. PSI-D mediates tight binding of PSI-C that is characteristic of plant PSI [Scheller01].

PS I from Synechocystis PCC 6803 contains seven different polypeptides. The polypeptide corresponding to subunit II from higher plants is missing [Chitnis89].

Citations: [Minai01]


Subunit of photosystem I complex: Photosystem I reaction center subunit IV

Synonyms: PsaE, Photosystem I 8.1 kDa protein, p30 protein

Gene: psaE Accession Number: G-412 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 8.14 kD (from nucleotide sequence)

pI: 6.5 [Chitnis89]

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:ssr2831 , Protein Model Portal:P12975 , SMR:P12975 , String:1148.ssr2831 , UniProt:P12975

Relationship Links: InterPro:IN-FAMILY:IPR003375 , InterPro:IN-FAMILY:IPR008990 , PDB:Structure:1GXI , Pfam:IN-FAMILY:PF02427 , ProDom:IN-FAMILY:PD004772

Summary:
The PsaE protein is located on the stromal side of photosystem I (PSI) and is involved in docking the soluble electron acceptors, particularly ferredoxin [Fischer98a]. It stabilizes the interaction between psaC and the PSI core and interacts with ferredoxin-NADP oxidoreductase [Kruip97].


Subunit of photosystem I complex: Photosystem I reaction center subunit III

Synonyms: PsaF, PSI-F

Gene: psaF Accession Number: G-411 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 18.249 kD (from nucleotide sequence)

pI: 6.4 [Chitnis91]

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:sll0819 , Protein Model Portal:P29256 , SMR:P29256 , String:1148.sll0819 , UniProt:P29256

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

Summary:
PSI-F is an integral membrane protein involved in the docking of plastocyanin [Farah95]. In the absence of PSI-F, there is no stable complex formed between PSI and plastocyanin [Haldrup00]. Furthermore, plants lacking PSI-F have a reduced rate of electron donation from plastocyanin to P700 and are hampered in the energy transfer from LHCI [Hippler97] . Although Lhca1 and Lhca4 remain in the PSI complex, they cannot transfer energy from LHCI in the absence of PSI-F.

Citations: [Kruip97]


Subunit of photosystem I complex: Photosystem I reaction center subunit VIII

Synonyms: PsaL

Gene: psaL Accession Number: G-410 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 4.413 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:smr0004 , Protein Model Portal:Q55330 , SMR:Q55330 , String:1148.smr0004 , UniProt:Q55330

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: [Kruip97, Xu95d, Nakamoto95]


Subunit of photosystem I complex: Photosystem I reaction center subunit IX

Synonyms: PsaJ

Gene: psaJ Accession Number: G-409 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 4.532 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:sml0008 , Protein Model Portal:Q55329 , SMR:Q55329 , String:1148.sml0008 , UniProt:Q55329

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].

Citations: [Schottler07]


Subunit of photosystem I complex: Photosystem I reaction center subunit PsaK 1

Synonyms: Photosystem I subunit X 1

Gene: psaK1 Accession Number: G-408 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 8.644 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:ssr0390 , Protein Model Portal:P72712 , String:1148.ssr0390 , UniProt:P72712

Relationship Links: InterPro:IN-FAMILY:IPR000549 , InterPro:IN-FAMILY:IPR017492 , 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]. PsaK maybe involved in the assembly of PSI monomers into trimers in cyanobacteria and is active under low light conditions.

Citations: [Duhring07]


Subunit of photosystem I complex: Photosystem I reaction center subunit XI

Synonyms: PsaL, PSI subunit V, PSI-L

Gene: psaL Accession Number: G-407 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 16.624 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:slr1655 , Protein Model Portal:P37277 , SMR:P37277 , String:1148.slr1655 , UniProt:P37277

Relationship Links: InterPro:IN-FAMILY:IPR003757 , InterPro:IN-FAMILY:IPR022980 , Pfam:IN-FAMILY:PF02605 , ProDom:IN-FAMILY:PD005947

Summary:
PSI-L is involved in the trimerization of PSI in cyanobacteria.

Citations: [Chitnis93, Kruip97]


Subunit of photosystem I complex: Photosystem I reaction center subunit XII

Synonyms: PsaM, PSI-M

Gene: psaM Accession Number: G-406 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 3.38 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:smr0005 , Protein Model Portal:P72986 , SMR:P72986 , String:1148.smr0005 , UniProt:P72986

Relationship Links: InterPro:IN-FAMILY:IPR010010 , Pfam:IN-FAMILY:PF07465

Summary:
PsaM coordinates one chlorophyll a and this may play a role in the transfer of excitation energy between monomers [Grotjohann05]. It also mediates hydrophobic contacts with a carotenoid molecule [Grotjohann05].


Subunit of photosystem I complex: Photosystem I reaction center subunit PsaK 2

Synonyms: Photosystem I subunit X 2

Gene: psaK2 Accession Number: G-12829 (MetaCyc)

Locations: thylakoid membrane

Molecular Weight: 9.3 kD (from nucleotide sequence)

GO Terms:

Cellular Component: GO:0042651 - thylakoid membrane

Unification Links: KEGG:sll0629 , Protein Model Portal:P74564 , SMR:P74564 , String:1148.sll0629 , UniProt:P74564

Relationship Links: InterPro:IN-FAMILY:IPR000549 , InterPro:IN-FAMILY:IPR017492 , Pfam:IN-FAMILY:PF01241 , Prosite:IN-FAMILY:PS01026

Summary:
Photosystem I subunit PsaK maybe involved in the assembly of PSI monomers into trimers, and is active under low light conditions [Ozawa09].


References

Chitnis89: Chitnis PR, Reilly PA, Miedel MC, Nelson N (1989). "Structure and targeted mutagenesis of the gene encoding 8-kDa subunit of photosystem I from the cyanobacterium Synechocystis sp. PCC 6803." J Biol Chem 1989;264(31);18374-80. PMID: 2509456

Chitnis91: Chitnis PR, Purvis D, Nelson N (1991). "Molecular cloning and targeted mutagenesis of the gene psaF encoding subunit III of photosystem I from the cyanobacterium Synechocystis sp. PCC 6803." J Biol Chem 1991;266(30);20146-51. PMID: 1939076

Chitnis93: Chitnis VP, Xu Q, Yu L, Golbeck JH, Nakamoto H, Xie DL, Chitnis PR (1993). "Targeted inactivation of the gene psaL encoding a subunit of photosystem I of the cyanobacterium Synechocystis sp. PCC 6803." J Biol Chem 1993;268(16);11678-84. PMID: 7685019

Duhring07: Duhring U, Ossenbuhl F, Wilde A (2007). "Late assembly steps and dynamics of the cyanobacterial photosystem I." J Biol Chem 282(15);10915-21. PMID: 17303568

Farah95: Farah J, Rappaport F, Choquet Y, Joliot P, Rochaix JD (1995). "Isolation of a psaF-deficient mutant of Chlamydomonas reinhardtii: efficient interaction of plastocyanin with the photosystem I reaction center is mediated by the PsaF subunit." EMBO J 14(20);4976-84. PMID: 7588626

Fischer97: Fischer N, Setif P, Rochaix JD (1997). "Targeted mutations in the psaC gene of Chlamydomonas reinhardtii: preferential reduction of FB at low temperature is not accompanied by altered electron flow from photosystem I to ferredoxin." Biochemistry 36(1);93-102. PMID: 8993322

Fischer98a: Fischer N, Hippler M, Setif P, Jacquot JP, Rochaix JD (1998). "The PsaC subunit of photosystem I provides an essential lysine residue for fast electron transfer to ferredoxin." EMBO J 17(4);849-58. PMID: 9463363

Fischer99: Fischer N, Setif P, Rochaix JD (1999). "Site-directed mutagenesis of the PsaC subunit of photosystem I. F(b) is the cluster interacting with soluble ferredoxin." J Biol Chem 274(33);23333-40. PMID: 10438510

Golbeck06: Golbeck J. H. (2006). "Photosystem I The Light Driven Plastocyanin:Ferredoxin Oxidoreductase." Advances in Photosynthesis and Respiration.

Grotjohann05: Grotjohann I, Fromme P (2005). "Structure of cyanobacterial photosystem I." Photosynth Res 85(1);51-72. PMID: 15977059

Haldrup00: Haldrup A, Simpson DJ, Scheller HV (2000). "Down-regulation of the PSI-F subunit of photosystem I (PSI) in Arabidopsis thaliana. The PSI-F subunit is essential for photoautotrophic growth and contributes to antenna function." J Biol Chem 2000;275(40);31211-8. PMID: 10900198

Hippler97: Hippler M, Drepper F, Farah J, Rochaix JD (1997). "Fast electron transfer from cytochrome c6 and plastocyanin to photosystem I of Chlamydomonas reinhardtii requires PsaF." Biochemistry 36(21);6343-9. PMID: 9174349

Jung97: Jung YS, Vassiliev IR, Yu J, McIntosh L, Golbeck JH (1997). "Strains of Synechocystis sp. PCC 6803 with altered PsaC. II. EPR and optical spectroscopic properties of FA and FB in aspartate, serine, and alanine replacements of cysteines 14 and 51." J Biol Chem 272(12);8040-9. PMID: 9065477

Kaneko96: Kaneko T, Sato S, Kotani H, Tanaka A, Asamizu E, Nakamura Y, Miyajima N, Hirosawa M, Sugiura M, Sasamoto S, Kimura T, Hosouchi T, Matsuno A, Muraki A, Nakazaki N, Naruo K, Okumura S, Shimpo S, Takeuchi C, Wada T, Watanabe A, Yamada M, Yasuda M, Tabata S (1996). "Sequence analysis of the genome of the unicellular cyanobacterium Synechocystis sp. strain PCC6803. II. Sequence determination of the entire genome and assignment of potential protein-coding regions." DNA Res 1996;3(3);109-36. PMID: 8905231

Kruip93: Kruip J, Boekema EJ, Bald D, Boonstra AF, Rogner M (1993). "Isolation and structural characterization of monomeric and trimeric photosystem I complexes (P700.FA/FB and P700.FX) from the cyanobacterium Synechocystis PCC 6803." J Biol Chem 1993;268(31);23353-60. PMID: 8226860

Kruip97: Kruip J, Chitnis PR, Lagoutte B, Rogner M, Boekema EJ (1997). "Structural organization of the major subunits in cyanobacterial photosystem 1. Localization of subunits PsaC, -D, -E, -F, and -J." J Biol Chem 1997;272(27);17061-9. PMID: 9202022

Minai01: Minai L, Fish A, Darash-Yahana M, Verchovsky L, Nechushtai R (2001). "The assembly of the PsaD subunit into the membranal photosystem I complex occurs via an exchange mechanism." Biochemistry 40(43);12754-60. PMID: 11669611

Nakamoto95: Nakamoto H (1995). "Targeted inactivation of the gene psaI encoding a subunit of photosystem I of the cyanobacterium Synechocystis sp. PCC 6803." Plant Cell Physiol 1995;36(8);1579-87. PMID: 8589933

Nakamura03: Nakamura A, Akai M, Yoshida E, Taki T, Watanabe T (2003). "Reversed-phase HPLC determination of chlorophyll a' and phylloquinone in Photosystem I of oxygenic photosynthetic organisms. Universal existence of one chlorophyll a' molecule in Photosystem I." Eur J Biochem 270(11);2446-58. PMID: 12755700

Ozawa09: Ozawa S, Nield J, Terao A, Stauber EJ, Hippler M, Koike H, Rochaix JD, Takahashi Y (2009). "Biochemical and structural studies of the large Ycf4-photosystem I assembly complex of the green alga Chlamydomonas reinhardtii." Plant Cell 21(8);2424-42. PMID: 19700633

Ozawa10: Ozawa S, Onishi T, Takahashi Y (2010). "Identification and characterization of an assembly intermediate subcomplex of photosystem I in the green alga Chlamydomonas reinhardtii." J Biol Chem 285(26);20072-9. PMID: 20413595

Park06a: Park YJ, Yoo CB, Choi SY, Lee HB (2006). "Purifications and characterizations of a ferredoxin and its related 2-oxoacid:ferredoxin oxidoreductase from the hyperthermophilic archaeon, Sulfolobus solfataricus P1." J Biochem Mol Biol 39(1);46-54. PMID: 16466637

Scheller01: Scheller HV, Jensen PE, Haldrup A, Lunde C, Knoetzel J (2001). "Role of subunits in eukaryotic Photosystem I." Biochim Biophys Acta 1507(1-3);41-60. PMID: 11687207

Schottler07: Schottler MA, Flugel C, Thiele W, Stegemann S, Bock R (2007). "The plastome-encoded PsaJ subunit is required for efficient Photosystem I excitation, but not for plastocyanin oxidation in tobacco." Biochem J 403(2);251-60. PMID: 17209805

Smart91: Smart LB, McIntosh L (1991). "Expression of photosynthesis genes in the cyanobacterium Synechocystis sp. PCC 6803: psaA-psaB and psbA transcripts accumulate in dark-grown cells." Plant Mol Biol 17(5);959-71. PMID: 1932686

Sun97a: Sun J, Xu Q, Chitnis VP, Jin P, Chitnis PR (1997). "Topography of the photosystem I core proteins of the cyanobacterium Synechocystis sp. PCC 6803." J Biol Chem 272(35);21793-802. PMID: 9268309

Xu95d: Xu Q, Hoppe D, Chitnis VP, Odom WR, Guikema JA, Chitnis PR (1995). "Mutational analysis of photosystem I polypeptides in the cyanobacterium Synechocystis sp. PCC 6803. Targeted inactivation of psaI reveals the function of psaI in the structural organization of psaL." J Biol Chem 1995;270(27);16243-50. PMID: 7608190

Yu95: Yu J, Smart LB, Jung YS, Golbeck J, McIntosh L (1995). "Absence of PsaC subunit allows assembly of photosystem I core but prevents the binding of PsaD and PsaE in Synechocystis sp. PCC6803." Plant Mol Biol 29(2);331-42. PMID: 7579183


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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
Page generated by SRI International Pathway Tools version 18.5 on Fri Dec 19, 2014, BIOCYC14B.