Q8DJZ6 · PSBI_THEVB
- ProteinPhotosystem II reaction center protein I
- GenepsbI
- StatusUniProtKB reviewed (Swiss-Prot)
- Amino acids
- Protein existenceEvidence at protein level
- Annotation score5/5
Function
function
One of the components of the core complex of photosystem II (PSII). May be required for formation of PSII dimers but not their subsequent stability (PubMed:21195048).
PSII is a light-driven water:plastoquinone oxidoreductase that uses light energy to abstract electrons from H2O, generating O2 and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation.
PSII is a light-driven water:plastoquinone oxidoreductase that uses light energy to abstract electrons from H2O, generating O2 and a proton gradient subsequently used for ATP formation. It consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation.
Cofactor
Note: PSII binds multiple chlorophylls, carotenoids and specific lipids.
GO annotations
all annotations | all molecular function | virus receptor activity | dna binding | rna binding | cytoskeletal motor activity | catalytic activity | gtpase activity | structural molecule activity | transporter activity | cytoskeletal protein binding | lipid binding | cyclase activity | antioxidant activity | oxidoreductase activity | transferase activity | hydrolase activity | lyase activity | isomerase activity | ligase activity | protein tag activity | cargo receptor activity | histone binding | protein folding chaperone | translation regulator activity | nutrient reservoir activity | receptor ligand activity | molecular transducer activity | molecular adaptor activity | toxin activity | cell adhesion mediator activity | molecular function regulator activity | virus coreceptor activity | catalytic activity, acting on a protein | catalytic activity, acting on dna | catalytic activity, acting on rna | molecular carrier activity | transcription regulator activity | general transcription initiation factor activity | molecular sensor activity | molecular sequestering activity | atp-dependent activity | other molecular function | all biological process | mitotic cell cycle | cytokinesis | cytoplasmic translation | immune system process | muscle system process | circulatory system process | renal system process | respiratory system process | carbohydrate metabolic process | generation of precursor metabolites and energy | dna replication | dna repair | dna recombination | chromatin organization | dna-templated transcription | regulation of dna-templated transcription | trna metabolic process | protein folding | protein glycosylation | amino acid metabolic process | modified amino acid metabolic process | lipid metabolic process | vitamin metabolic process | sulfur compound metabolic process | intracellular protein transport | nucleocytoplasmic transport | autophagy | inflammatory response | mitochondrion organization | cytoskeleton organization | microtubule-based movement | peroxisome organization | lysosome organization | chromosome segregation | cell adhesion | establishment or maintenance of cell polarity | programmed cell death | photosynthesis | mrna metabolic process | snrna metabolic process | vesicle-mediated transport | reproductive process | digestive system process | signaling | cell differentiation | protein catabolic process | extracellular matrix organization | regulatory ncrna-mediated gene silencing | telomere organization | cell junction organization | wound healing | ribosome biogenesis | cilium organization | anatomical structure development | cell motility | nervous system process | endocrine process | protein maturation | transmembrane transport | nucleobase-containing small molecule metabolic process | hepaticobiliary system process | membrane organization | protein-containing complex assembly | cell wall organization or biogenesis | nitrogen cycle metabolic process | protein localization to plasma membrane | defense response to other organism | detoxification | meiotic nuclear division | mitotic nuclear division | mitochondrial gene expression | carbohydrate derivative metabolic process | other biological process | all cellular component | nuclear chromosome | extracellular region | extracellular space | cell wall | nucleus | nuclear envelope | nucleoplasm | chromosome | nucleolus | mitochondrion | lysosome | endosome | vacuole | peroxisome | endoplasmic reticulum | golgi apparatus | lipid droplet | microtubule organizing center | cytosol | ribosome | cytoskeleton | plasma membrane | cilium | plastid | thylakoid | external encapsulating structure | extracellular matrix | cytoplasmic vesicle | organelle | other cellular component | |||
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Aspect | Term | |
---|---|---|
Cellular Component | photosystem II reaction center | |
Cellular Component | plasma membrane-derived thylakoid membrane | |
Biological Process | photosynthesis |
Keywords
- Biological process
Names & Taxonomy
Protein names
- Recommended namePhotosystem II reaction center protein I
- Short namesPSII-I
- Alternative names
Gene names
Organism names
- Strain
- Taxonomic lineageBacteria > Cyanobacteriota > Cyanophyceae > Acaryochloridales > Thermosynechococcaceae > Thermosynechococcus
Accessions
- Primary accessionQ8DJZ6
- Secondary accessions
Proteomes
Subcellular Location
UniProt Annotation
GO Annotation
Cellular thylakoid membrane ; Single-pass membrane protein
Features
Showing features for topological domain, transmembrane.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Topological domain | 1-2 | Lumenal | ||||
Sequence: ME | ||||||
Transmembrane | 3-24 | Helical | ||||
Sequence: TLKITVYIVVTFFVLLFVFGFL | ||||||
Topological domain | 25-38 | Cytoplasmic | ||||
Sequence: SGDPARNPKRKDLE |
Keywords
- Cellular component
Phenotypes & Variants
Disruption phenotype
Decreased yields of PSII dimers with increased PSII monomers, slightly slower photoautotrophic growth, about 20% less oxygen evolution. Formed PSII dimers are stable.
PTM/Processing
Features
Showing features for modified residue, chain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Modified residue | 1 | N-formylmethionine | ||||
Sequence: M | ||||||
Chain | PRO_0000219660 | 1-38 | Photosystem II reaction center protein I | |||
Sequence: METLKITVYIVVTFFVLLFVFGFLSGDPARNPKRKDLE |
Keywords
- PTM
Interaction
Subunit
PSII is composed of 1 copy each of membrane proteins PsbA, PsbB, PsbC, PsbD, PsbE, PsbF, PsbH, PsbI, PsbJ, PsbK, PsbL, PsbM, PsbT, PsbX, PsbY, PsbZ, Psb30/Ycf12, peripheral proteins PsbO, CyanoQ (PsbQ), PsbU, PsbV and a large number of cofactors. It forms dimeric complexes. Part of a photosystem II (PSII) assembly intermediate complex PSII-I; crystallized from a strain deleted of psbJ, it forms monomeric PSII before addition of the oxygen evolving complex. PSII-I includes 3 assembly factors not found in mature PSII (Psb27, Psb28 and Psb34) (PubMed:33846594).
Protein-protein interaction databases
Structure
Sequence
- Sequence statusComplete
- Length38
- Mass (Da)4,405
- Last updated2003-03-01 v1
- Checksum02DDC30594997948
Mass Spectrometry
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AB052849 EMBL· GenBank· DDBJ | BAB20622.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
BA000039 EMBL· GenBank· DDBJ | BAC08627.1 EMBL· GenBank· DDBJ | Genomic DNA |