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Entry version 57 (22 Apr 2020)
Sequence version 1 (30 May 2006)
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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Tetradesmus obliquus (Green alga) (Acutodesmus obliquus)
Status
Reviewed-Annotation score:

Annotation score:3 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
-Protein inferred from homologyi <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

PsaA and PsaB bind P700, the primary electron donor of photosystem I (PSI), as well as the electron acceptors A0, A1 and FX. PSI is a plastocyanin/cytochrome c6-ferredoxin oxidoreductase, converting photonic excitation into a charge separation, which transfers an electron from the donor P700 chlorophyll pair to the spectroscopically characterized acceptors A0, A1, FX, FA and FB in turn. Oxidized P700 is reduced on the lumenal side of the thylakoid membrane by plastocyanin or cytochrome c6.UniRule annotation

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

Note: P700 is a chlorophyll a/chlorophyll a' dimer, A0 is one or more chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the 'Description' field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi560Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi569Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi655Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation1
Metal bindingi663Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei671Chlorophyll-a B3UniRule annotation1
Binding sitei672Phylloquinone BUniRule annotation1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

GO - Biological processi

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionOxidoreductase
Biological processElectron transport, Photosynthesis, Transport
Ligand4Fe-4S, Chlorophyll, Chromophore, Iron, Iron-sulfur, Magnesium, Metal-binding

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2UniRule annotation (EC:1.97.1.12UniRule annotation)
Alternative name(s):
PSI-BUniRule annotation
PsaBUniRule annotation
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:psaBUniRule annotation
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates if the gene coding for the protein originates from the hydrogenosome, the mitochondrion, the nucleomorph, different plastids or a plasmid. The absence of this section means that the gene is located in one of the main chromosomal element(s).<p><a href='/help/encoded_on' target='_top'>More...</a></p>Encoded oniPlastid; Chloroplast
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiTetradesmus obliquus (Green alga) (Acutodesmus obliquus)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri3088 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryotaViridiplantaeChlorophytacore chlorophytesChlorophyceaeSphaeroplealesScenedesmaceaeTetradesmus

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Extracellular region or secreted Cytosol Plasma membrane Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei47 – 70Helical; Name=IUniRule annotationAdd BLAST24
Transmembranei136 – 159Helical; Name=IIUniRule annotationAdd BLAST24
Transmembranei176 – 200Helical; Name=IIIUniRule annotationAdd BLAST25
Transmembranei274 – 292Helical; Name=IVUniRule annotationAdd BLAST19
Transmembranei331 – 354Helical; Name=VUniRule annotationAdd BLAST24
Transmembranei370 – 396Helical; Name=VIUniRule annotationAdd BLAST27
Transmembranei418 – 440Helical; Name=VIIUniRule annotationAdd BLAST23
Transmembranei518 – 536Helical; Name=VIIIUniRule annotationAdd BLAST19
Transmembranei576 – 597Helical; Name=IXUniRule annotationAdd BLAST22
Transmembranei644 – 666Helical; Name=XUniRule annotationAdd BLAST23
Transmembranei708 – 728Helical; Name=XIUniRule annotationAdd BLAST21

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00002771311 – 735Photosystem I P700 chlorophyll a apoprotein A2Add BLAST735

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
Q1KVS5

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

The PsaA/B heterodimer binds the P700 chlorophyll special pair and subsequent electron acceptors. PSI consists of a core antenna complex that captures photons, and an electron transfer chain that converts photonic excitation into a charge separation. The eukaryotic PSI reaction center is composed of at least 11 subunits.

UniRule annotation

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...
SMRi
Q1KVS5

Database of comparative protein structure models

More...
ModBasei
Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
1.20.1130.10, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00482, PSI_PsaB, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR001280, PSI_PsaA/B
IPR020586, PSI_PsaA/B_CS
IPR036408, PSI_PsaA/B_sf
IPR006244, PSI_PsaB

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00223, PsaA_PsaB, 1 hit

PIRSF; a whole-protein classification database

More...
PIRSFi
PIRSF002905, PSI_A, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00257, PHOTSYSPSAAB

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF81558, SSF81558, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR01336, psaB, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00419, PHOTOSYSTEM_I_PSAAB, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

Q1KVS5-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MATKLFPKFS QGLAQDPTTR RIWFGLAVAH DFESHDGMTE ENLYQKIFAS
60 70 80 90 100
HFGQLAIIFL WTSGNLFHVA WQGNFEQWGA DPIHVRPIAH AIWDPHFGQP
110 120 130 140 150
AVEAFTRGGA SGPVNISTSG LYQWWYTIGM RTNQDLYVGS VFLALVSAIF
160 170 180 190 200
LFAGWLHLQP SFQPSLSWFK DAESRLNHHL SGLFGVSSLA WTGHLVHVAI
210 220 230 240 250
PESRGKHVGW DNFLTQLPHP QGLTPFWTGN WAAYAQNPDS ASHIFGTSDG
260 270 280 290 300
AGEAILTFLG GFHPQTQSLW LTDMAHHHLA IAVLFIVAGH MYRTNFGIGH
310 320 330 340 350
RMSAILDAHV APSGRLGAGH KGLFETVNNS LHFQLGLALA SVGTICSLVA
360 370 380 390 400
QHMYSLPPYA FLANDFTTQA ALYTHHQYIA GFIMCGAFAH GAIFWIRDYD
410 420 430 440 450
PEQNKGNVLS RMLDHKEAII SHLSWVSLFL GFHTLGLYVH NDVMLAFGTP
460 470 480 490 500
EKQILIEPVF AQWIQAAHGK AFYGFDLLLS SSSSSASSAS QTLWLPGWLD
510 520 530 540 550
AINNNQNSLF LTIGPGDFLV HHAIALGLHT TTLILVKGAL DARGSKLMPD
560 570 580 590 600
KKDFGYSFPC DGPGRGGTCD ISAYDAFYLA VFWMLNTIGW VTFYWHWKHL
610 620 630 640 650
TLWQGNVSQF DESSTYLMGW LRDYLWLNSS QLINGYNPFG MNSLSVWAWM
660 670 680 690 700
FLAGHLVYAT GFMFLISWRG YWQELIETLV WAHEKTPLAN LVYWKDKPVA
710 720 730
LSIVQARLVG LAHFSVGYVF TYAAFVIAST SGKFG
Length:735
Mass (Da):81,902
Last modified:May 30, 2006 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i3F0F412ABC09636A
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

More...
GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
DQ396875 Genomic DNA Translation: ABD48282.1

NCBI Reference Sequences

More...
RefSeqi
YP_635999.1, NC_008101.1

Genome annotation databases

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
4099791

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
DQ396875 Genomic DNA Translation: ABD48282.1
RefSeqiYP_635999.1, NC_008101.1

3D structure databases

SMRiQ1KVS5
ModBaseiSearch...

Proteomic databases

PRIDEiQ1KVS5

Genome annotation databases

GeneIDi4099791

Family and domain databases

Gene3Di1.20.1130.10, 1 hit
HAMAPiMF_00482, PSI_PsaB, 1 hit
InterProiView protein in InterPro
IPR001280, PSI_PsaA/B
IPR020586, PSI_PsaA/B_CS
IPR036408, PSI_PsaA/B_sf
IPR006244, PSI_PsaB
PfamiView protein in Pfam
PF00223, PsaA_PsaB, 1 hit
PIRSFiPIRSF002905, PSI_A, 1 hit
PRINTSiPR00257, PHOTSYSPSAAB
SUPFAMiSSF81558, SSF81558, 1 hit
TIGRFAMsiTIGR01336, psaB, 1 hit
PROSITEiView protein in PROSITE
PS00419, PHOTOSYSTEM_I_PSAAB, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiPSAB_TETOB
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: Q1KVS5
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: May 30, 2006
Last modified: April 22, 2020
This is version 57 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families
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