Photosystem I P700 chlorophyll a apoprotein A2 - Prochlorococcus marinus (strain NATL2A)

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Q46IV5 (PSAB_PROMT) Reviewed, UniProtKB/Swiss-Prot

Last modified May 1, 2013. Version 57. History...

Clusters with 100%, 90%, 50% identity |

Documents (1) |

Third-party data

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Names·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·Documents Customize order

Names and origin

Protein names

Recommended name:
Photosystem I P700 chlorophyll a apoprotein A2
EC=1.97.1.12

Alternative name(s):
PsaB

Gene names

Name:	psaB
Ordered Locus Names:	PMN2A_1083

Organism

Prochlorococcus marinus (strain NATL2A) [Complete proteome] [HAMAP]

Taxonomic identifier

59920 [NCBI]

Taxonomic lineage

Bacteria › Cyanobacteria › Prochlorales › Prochlorococcaceae › Prochlorococcus ›

Protein attributes

Sequence length	742 AA.
Sequence status	Complete.
Protein existence	Inferred from homology

General annotation (Comments)

Function	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 By similarity. HAMAP-Rule MF_00482
Catalytic activity	Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin. HAMAP-Rule MF_00482
Cofactor	PSI electron transfer chain: 5 divinyl chlorophyll a, 1 divinyl chlorophyll a', 2 phylloquinones and 3 4Fe-4S clusters. PSI core antenna: 90 divinyl chlorophyll a, 22 carotenoids, 3 phospholipids and 1 galactolipid. P700 is a divinyl chlorophyll a/divinyl chlorophyll a' dimer, A0 is one or more divinyl chlorophyll a, A1 is one or both phylloquinones and FX is a shared 4Fe-4S iron-sulfur center By similarity.
Subunit structure	The PsaA/B heterodimer binds the P700 divinyl 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 By similarity.
Subcellular location	Cellular thylakoid membrane; Multi-pass membrane protein By similarity HAMAP-Rule MF_00482.
Sequence similarities	Belongs to the PsaA/PsaB family.

Ontologies

Keywords
Biological process	Electron transport Photosynthesis Transport
Cellular component	Membrane Photosystem I Thylakoid
Domain	Transmembrane Transmembrane helix
Ligand	4Fe-4S Chlorophyll Chromophore Iron Iron-sulfur Magnesium Metal-binding
Molecular function	Oxidoreductase
Technical term	Complete proteome
Gene Ontology (GO)
Biological_process	electron transport chain Inferred from electronic annotation. Source: UniProtKB-KW photosynthesis Inferred from electronic annotation. Source: HAMAP protein-chromophore linkage Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW photosystem I Inferred from electronic annotation. Source: UniProtKB-KW thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell
Molecular_function	4 iron, 4 sulfur cluster binding Inferred from electronic annotation. Source: UniProtKB-KW chlorophyll binding Inferred from electronic annotation. Source: UniProtKB-KW electron carrier activity Inferred from electronic annotation. Source: HAMAP magnesium ion binding Inferred from electronic annotation. Source: HAMAP oxidoreductase activity Inferred from electronic annotation. Source: UniProtKB-KW
Complete GO annotation...

Sequence annotation (Features)

Feature key

Position(s)

Length

Description

Graphical view

Feature identifier

Molecule processing

Chain

1 – 742

742

Photosystem I P700 chlorophyll a apoprotein A2 HAMAP-Rule MF_00482

PRO_0000300022

Regions

Transmembrane

46 – 69

Helical; Name=I; Potential

Transmembrane

135 – 158

Helical; Name=II; Potential

Transmembrane

175 – 199

Helical; Name=III; Potential

Transmembrane

273 – 291

Helical; Name=IV; Potential

Transmembrane

336 – 359

Helical; Name=V; Potential

Transmembrane

375 – 401

Helical; Name=VI; Potential

Transmembrane

423 – 445

Helical; Name=VII; Potential

Transmembrane

525 – 543

Helical; Name=VIII; Potential

Transmembrane

583 – 604

Helical; Name=IX; Potential

Transmembrane

651 – 673

Helical; Name=X; Potential

Transmembrane

715 – 735

Helical; Name=XI; Potential

Sites

Metal binding

567

Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity

Metal binding

576

Iron-sulfur (4Fe-4S); shared with dimeric partner By similarity

Metal binding

662

Magnesium (divinyl chlorophyll-a B1 axial ligand; P700 special pair) By similarity

Metal binding

670

Magnesium (divinyl chlorophyll-a B3 axial ligand) By similarity

Binding site

678

Divinyl chlorophyll-a B3 By similarity

Binding site

679

Phylloquinone B By similarity

Sequences

Sequence

Length

Mass (Da)

Tools

Q46IV5 [UniParc].

Last modified September 13, 2005. Version 1.
Checksum: EDEDEFBE1CD80364
Show »

FASTA

742

82,846

        10         20         30         40         50         60 
MATKFPSFSQ GLAQDPTTRR IWYGIATAHD FESHDGMTEE QLYQKLFSTH FGHLAIIGLW 

        70         80         90        100        110        120 
VAGNLFHIAW QGNFEQWVLD PLHTRPIAHA IWDPHFGQGL TDALTQAGAT SPVNIAYSGL 

       130        140        150        160        170        180 
YHWWYTIGMR TNEQLFQGAI FINILVCWLL FAGWLHLQPK YRPSLAWFKN AESQLNHHLA 

       190        200        210        220        230        240 
VLFGFSSIAW TGHLIHVAIP ESRGIHVGWE NWLTVMPHPE GLTPFFSGNW GAYAQNPDSI 

       250        260        270        280        290        300 
DAVFGTSQGA GTAIFTFLGG LHPQSESLWL TDIAHHHLAI GVVFIIAGHM YRTNFGIGHS 

       310        320        330        340        350        360 
LKEIIEAHNT SHPKDPHRGY FGIKHNGLFE TVNNSLHFQL GLALASLGVA CSLVAQHMGA 

       370        380        390        400        410        420 
LPSYAFIARD YTTQSALYTH HQYIAMFLMV GAFSHGAIFF VRDYDPELNK DNVLARILST 

       430        440        450        460        470        480 
KEALISHLSW VTMLLGFHTL GIYVHNDVVV AFGTPEKQIL IEPVFAQFAQ AASGKMMYGF 

       490        500        510        520        530        540 
NALLANASSS ASIAANSMPG NHYWMDMINR PDALTNFLPI GPADFLVHHA IALGLHTTAL 

       550        560        570        580        590        600 
ILIKGALDAR GTKLIPDKKD LGFAFPCDGP GRGGTCDSSS WDATYLAMFW ALNTIAWITF 

       610        620        630        640        650        660 
YWHWKHLAIW MGNTAQFNES GTYLMGWFRD YLWLNSSQLI NGYNPFGVNA LSPWAWMFLF 

       670        680        690        700        710        720 
GHLIWATGFM FLISWRGYWQ ELIETLVWAH QRTPIANLVG WRDKPVALSI VQARLVGLTH 

       730        740 
FTVGNFVTFG AFVIASTSGK FG

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References

[1]

"Patterns and implications of gene gain and loss in the evolution of Prochlorococcus."
Kettler G.C., Martiny A.C., Huang K., Zucker J., Coleman M.L., Rodrigue S., Chen F., Lapidus A., Ferriera S., Johnson J., Steglich C., Church G.M., Richardson P., Chisholm S.W.
PLoS Genet. 3:2515-2528(2007) [PubMed] [Europe PMC] [Abstract]
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Strain: NATL2A.

Cross-references

Sequence databases
EMBL GenBank DDBJ	CP000095 Genomic DNA. Translation: AAZ58573.1.
RefSeq	YP_292276.1. NC_007335.2.
3D structure databases
ProteinModelPortal	Q46IV5.
SMR	Q46IV5. Positions 2-741.
ModBase	Search...
Protein-protein interaction databases
STRING	59920.PMN2A_1083.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Genome annotation databases
EnsemblBacteria	AAZ58573; AAZ58573; PMN2A_1083.
GeneID	3606470.
KEGG	pmn:PMN2A_1083.
PATRIC	23026027. VBIProMar14922_1940.
Organism-specific databases
CMR	Search...
Phylogenomic databases
eggNOG	NOG04867.
HOGENOM	HOG000276868.
KO	K02690.
OMA	AQFNESS.
ProtClustDB	PRK13199.
Enzyme and pathway databases
BioCyc	PMAR59920:GI1O-1110-MONOMER.
Family and domain databases
Gene3D	1.20.1130.10. 1 hit.
HAMAP	MF_00482. PSI_PsaB.
InterPro	IPR001280. PSI_PsaA/B. IPR020586. PSI_PsaA/B_CS. IPR006244. PSI_PsaB. [Graphical view]
Pfam	PF00223. PsaA_PsaB. 1 hit. [Graphical view]
PIRSF	PIRSF002905. PSI_A. 1 hit.
PRINTS	PR00257. PHOTSYSPSAAB.
TIGRFAMs	TIGR01336. psaB. 1 hit.
PROSITE	PS00419. PHOTOSYSTEM_I_PSAAB. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

PSAB_PROMT

Accession

Primary (citable) accession number: Q46IV5

Entry history

Integrated into UniProtKB/Swiss-Prot:	September 11, 2007
Last sequence update:	September 13, 2005
Last modified:	May 1, 2013
This is version 57 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Prokaryotic Protein Annotation Program

Relevant documents

SIMILARITY comments

Index of protein domains and families

Names·Attributes·General annotation·Ontologies·Sequence annotation·Sequences·References·Cross-refs·Entry info·Documents

Preferred order of sections

Names and origin

Protein attributes

General annotation (Comments)

Ontologies

Sequence annotation (Features)

Molecule processing

Regions

Sites

Sequences

References

Cross-references

Sequence databases

3D structure databases

Protein-protein interaction databases

Protocols and materials databases

Genome annotation databases

Organism-specific databases

Phylogenomic databases

Enzyme and pathway databases

Family and domain databases

Entry information

Relevant documents