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UniProtKB - P0A408 (PSAB_SYNEL)

Entry version 77 (02 Jun 2021)
Sequence version 2 (23 Jan 2007)
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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Synechococcus elongatus
Status
Reviewed-Annotation score:

Annotation score:4 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.

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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: PSI electron transfer chain: 5 chlorophyll a, 1 chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. 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.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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 bindingi566Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi575Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi661Magnesium (chlorophyll-a B1 axial ligand)UniRule annotation1
Metal bindingi669Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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 sitei677Chlorophyll-a B3UniRule annotation1
Binding sitei678Phylloquinone 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

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<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_and_taxonomy_section">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):
PsaBUniRule annotation
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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_and_taxonomy_section">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>OrganismiSynechococcus elongatus
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri32046 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiBacteria › Cyanobacteria › Synechococcales › Synechococcaceae › Synechococcus

<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

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular_location_section">'Subcellular location'</a> section describes the subcellular compartment where each non-membrane region of a membrane-spanning protein is found.<p><a href='/help/topo_dom' target='_top'>More...</a></p>Topological domaini2 – 38CytoplasmicCuratedAdd BLAST37
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular_location_section">'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>Transmembranei39 – 70Helical; Name=IUniRule annotationAdd BLAST32
Topological domaini71 – 131Lumenal, thylakoidCuratedAdd BLAST61
Transmembranei132 – 156Helical; Name=IIUniRule annotationAdd BLAST25
Topological domaini157 – 172CytoplasmicCuratedAdd BLAST16
Transmembranei173 – 195Helical; Name=IIIUniRule annotationAdd BLAST23
Topological domaini196 – 269Lumenal, thylakoidCuratedAdd BLAST74
Transmembranei270 – 287Helical; Name=IVUniRule annotationAdd BLAST18
Topological domaini288 – 334CytoplasmicCuratedAdd BLAST47
Transmembranei335 – 358Helical; Name=VUniRule annotationAdd BLAST24
Topological domaini359 – 368Lumenal, thylakoidCurated10
Transmembranei369 – 400Helical; Name=VIUniRule annotationAdd BLAST32
Topological domaini401 – 419CytoplasmicCuratedAdd BLAST19
Transmembranei420 – 449Helical; Name=VIIUniRule annotationAdd BLAST30
Topological domaini450 – 520Lumenal, thylakoidCuratedAdd BLAST71
Transmembranei521 – 545Helical; Name=VIIIUniRule annotationAdd BLAST25
Topological domaini546 – 578CytoplasmicCuratedAdd BLAST33
Transmembranei579 – 610Helical; Name=IXUniRule annotationAdd BLAST32
Topological domaini611 – 650Lumenal, thylakoidCuratedAdd BLAST40
Transmembranei651 – 672Helical; Name=XUniRule annotationAdd BLAST22
Topological domaini673 – 708CytoplasmicCuratedAdd BLAST36
Transmembranei709 – 737Helical; Name=XIUniRule annotationAdd BLAST29
Topological domaini738 – 741Lumenal, thylakoidCurated4

Keywords - Cellular componenti

Membrane, Photosystem I, 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 <a href="http://www.uniprot.org/help/ptm_processing_section">PTM / Processing</a> section indicates that the initiator methionine is cleaved from the mature protein.<p><a href='/help/init_met' target='_top'>More...</a></p>Initiator methionineiRemovedBy similarity
<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_00000886512 – 741Photosystem I P700 chlorophyll a apoprotein A2Add BLAST740

<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_section">'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_section">'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 cyanobacterial PSI reaction center is composed of one copy each of PsaA,B,C,D,E,F,I,J,K,L,M and X, and forms trimeric complexes.

<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		P0A408

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_length">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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> displayed by default in the entry is in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

P0A408-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MATKFPKFSQ DLAQDPTTRR IWYAIAMAHD FESHDGMTEE NLYQKIFASH 
        60         70         80         90        100
FGHLAIIFLW VSGSLFHVAW QGNFEQWVQD PVNTRPIAHA IWDPQFGKAA 
       110        120        130        140        150
VDAFTQAGAS NPVDIAYSGV YHWWYTIGMR TNGDLYQGAI FLLILASLAL 
       160        170        180        190        200
FAGWLHLQPK FRPSLSWFKN AESRLNHHLA GLFGVSSLAW AGHLIHVAIP 
       210        220        230        240        250
ESRGQHVGWD NFLSTMPHPA GLAPFFTGNW GVYAQNPDTA SHVFGTAQGA 
       260        270        280        290        300
GTAILTFLGG FHPQTESLWL TDMAHHHLAI AVLFIVAGHM YRTQFGIGHS 
       310        320        330        340        350
IKEMMDAKDF FGTKVEGPFN MPHQGIYETY NNSLHFQLGW HLACLGVITS 
       360        370        380        390        400
LVAQHMYSLP PYAFIAQDHT TMAALYTHHQ YIAGFLMVGA FAHGAIFLVR 
       410        420        430        440        450
DYDPAQNKGN VLDRVLQHKE AIISHLSWVS LFLGFHTLGL YVHNDVVVAF 
       460        470        480        490        500
GTPEKQILIE PVFAQFIQAA HGKLLYGFDT LLSNPDSIAS TAWPNYGNVW 
       510        520        530        540        550
LPGWLDAINS GTNSLFLTIG PGDFLVHHAI ALGLHTTTLI LVKGALDARG 
       560        570        580        590        600
SKLMPDKKDF GYAFPCDGPG RGGTCDISAW DAFYLAMFWM LNTIGWVTFY 
       610        620        630        640        650
WHWKHLGVWE GNVAQFNESS TYLMGWLRDY LWLNSSQLIN GYNPFGTNNL 
       660        670        680        690        700
SVWAWMFLFG HLVWATGFMF LISWRGYWQE LIETLVWAHE RTPLANLVRW 
       710        720        730        740 
KDKPVALSIV QARLVGLAHF SVGYILTYAA FLIASTAAKF G
Length:741
Mass (Da):83,044
Last modified:January 23, 2007 - v2
<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:i74961EF21401FB40
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
X63768 Genomic DNA Translation: CAA45305.1

<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
X63768 Genomic DNA Translation: CAA45305.1

3D structure databases

SMRiP0A408
ModBaseiSearch...

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

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_SYNEL
<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: P0A408
Secondary accession number(s): P25897
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: March 15, 2005
Last sequence update: January 23, 2007
Last modified: June 2, 2021
This is version 77 of the entry and version 2 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 programProkaryotic 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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