Gene: AT1G55670 (Arabidopsis thaliana)

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Gene Identifier
Transcript Identifier
Gene Type
Coding gene
1 : 20802874-20803356 : negative


Gene family
(40 genes in 30 species)
specific family

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photosystem I subunit G
Curated Summary
Encodes subunit G of photosystem I, an 11-kDa membrane protein that plays an important role in electron transport between plastocyanin and PSI and is involved in the stability of the PSI complex. PSI-G subunit is bound to PSI-B and is in contact with Lhca1. The protein inserts into thylakoids by a direct or 'spontaneous' pathway that does not involve the activities of any known chloroplast protein-targeting machinery. PSI-G appears to be directly or indirectly involved in the interaction between Photosystem I and plastocyanin.
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Identifier Name
aliasphotosystem I subunit G





Biological Process

GO termEvidence(s)ProviderDescriptionSource
GO:0015979IMP, ISS, IEAGene Ontologyphotosynthesis1 2
GO:0009773IMPUniProtphotosynthetic electron transport in photosystem I1 2 3 4 5
GO:0050821IMPUniProtprotein stabilization1 2 3 4 5
GO:0009780IMPUniProtphotosynthetic NADP+ reduction1 2 3 4 5
GO:0042550IMPUniProtphotosystem I stabilization1 2 3 4 5
GO:0019344RCAGene Ontologycysteine biosynthetic process1
GO:0030003RCAGene Ontologycellular cation homeostasis1
GO:0070838RCAGene Ontologydivalent metal ion transport1

Molecular Function

GO termEvidence(s)ProviderDescriptionSource
GO:0016168IEAUniProtchlorophyll binding1 2 3 4

Cellular Component

GO termEvidence(s)ProviderDescriptionSource
GO:0009507IDA, ISMGene Ontologychloroplast1 2
GO:0009522ISS, IEAGene Ontologyphotosystem I1
GO:0016020ISS, IEAGene Ontologymembrane1
GO:0009941IDAUniProtchloroplast envelope1 2 3 4 5
GO:0009535IDAGene Ontologychloroplast thylakoid membrane1
GO:0030093IDAUniProtchloroplast photosystem I1 2 3 4 5
GO:0009579IDAGene Ontologythylakoid1
GO:0009534IDAGene Ontologychloroplast thylakoid1
GO:0016021IEAUniProtintegral to membrane1 2 3 4

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Experimental Evidence
Electronic Evidence
Computational Reviewed Evidence
GO Sources:   Primary     Orthology     Homology  
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InterPro Description
IPR017494Photosystem I PsaG, plant
IPR000549Photosystem I PsaG/PsaK protein
IPR023618Photosystem I PsaG/PsaK domain

Mapman id Description I.PSI polypeptide subunits
No SignalP domains detected for this gene.