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Protein

Photosystem I P700 chlorophyll a apoprotein A2

Gene

psaB

Organism
Populus alba (White poplar)
Status
Reviewed-Annotation score: -Protein inferred from homologyi

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-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.UniRule annotation

Catalytic activityi

Reduced plastocyanin + oxidized ferredoxin + light = oxidized plastocyanin + reduced ferredoxin.UniRule annotation

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
Metal bindingi559Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi568Iron-sulfur (4Fe-4S); shared with dimeric partnerUniRule annotation1
Metal bindingi654Magnesium (chlorophyll-a B1 axial ligand; P700 special pair)UniRule annotation1
Metal bindingi662Magnesium (chlorophyll-a B3 axial ligand)UniRule annotation1
Binding sitei670Chlorophyll-a B3UniRule annotation1
Binding sitei671Phylloquinone BUniRule annotation1

GO - Molecular functioni

GO - Biological processi

Keywordsi

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

Names & Taxonomyi

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
Gene namesi
Name:psaBUniRule annotation
Encoded oniPlastid; Chloroplast
OrganismiPopulus alba (White poplar)
Taxonomic identifieri43335 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaerosidsfabidsMalpighialesSalicaceaeSaliceaePopulus

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; Source: COMPARTMENTS

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Transmembranei46 – 69Helical; Name=IUniRule annotationAdd BLAST24
Transmembranei135 – 158Helical; Name=IIUniRule annotationAdd BLAST24
Transmembranei175 – 199Helical; Name=IIIUniRule annotationAdd BLAST25
Transmembranei273 – 291Helical; Name=IVUniRule annotationAdd BLAST19
Transmembranei330 – 353Helical; Name=VUniRule annotationAdd BLAST24
Transmembranei369 – 395Helical; Name=VIUniRule annotationAdd BLAST27
Transmembranei417 – 439Helical; Name=VIIUniRule annotationAdd BLAST23
Transmembranei517 – 535Helical; Name=VIIIUniRule annotationAdd BLAST19
Transmembranei575 – 596Helical; Name=IXUniRule annotationAdd BLAST22
Transmembranei643 – 665Helical; Name=XUniRule annotationAdd BLAST23
Transmembranei707 – 727Helical; Name=XIUniRule annotationAdd BLAST21

Keywords - Cellular componenti

Chloroplast, Membrane, Photosystem I, Plastid, Thylakoid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00002771291 – 734Photosystem I P700 chlorophyll a apoprotein A2Add BLAST734

Interactioni

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

Structurei

3D structure databases

ProteinModelPortaliQ14FF8
SMRiQ14FF8
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the PsaA/PsaB family.UniRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

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

Sequencei

Sequence statusi: Complete.

Q14FF8-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MALRFPRFSQ GLAQDPTTRR IWFGIATAHD FESHDDITEE RLYQNIFASH
60 70 80 90 100
FGQLAIIFLW TSGNLFHVAW QGNFETWVQD PLHVRPIAHA IWDPHFGQPA
110 120 130 140 150
VEAFTRGGAL GPVNIAYSGV YQWWYTIGLR TNEDLYIGAL FLLFLSAVSL
160 170 180 190 200
LGGWLHLQPK WKPSVSWFKN AESRLNHHLS GLFGVSSLAW TGHLVHVAIP
210 220 230 240 250
GSRGESVRWN NFLDVLPHPQ GLGPLFTGQW NLYAQNPDSS SHLFGTSQGA
260 270 280 290 300
GTAILTLLGG FHPQTQSLWL TDMAHHHLAI AFLFLIAGHM YRTNFGIGHS
310 320 330 340 350
IKDLLEAHIP PGGRLGRGHK GLYDTINNSL HFQLGLALAS LGVITSLVAQ
360 370 380 390 400
HMYSLPAYAF IAQDFTTQAA LYTHHQYIAG FIMTGAFAHG AIFFIRDYNP
410 420 430 440 450
EQNEDNVLAR MLDHKEAIIS HLSWASLFLG FHTLGLYVHN DVMLAFGTPE
460 470 480 490 500
KQILIEPIFA QWIQSAHGKT SYGFDVLLSS TNSPAFNAGR SIWLPGWLNA
510 520 530 540 550
INENSNSLFL TIGPGDFLVH HAIALGLHTT TLILVKGALD ARGSKLMPDK
560 570 580 590 600
KDFGYSFPCD GPGRGGTCDI SAWDAFYLAV FWMLNTIGWV TFYWHWKHIT
610 620 630 640 650
LWQGNVSQFN ESSTYLMGWL RDYLWLNSSQ LINGYNPFGM NSLSVWAWMF
660 670 680 690 700
LFGHLVWATG FMFLISWRGY WQELIETLAW AHERTPLANL IRWRDKPVAL
710 720 730
SIVQARLVGL AHFSVGYIFT YAAFLIASTS GKFG
Length:734
Mass (Da):82,418
Last modified:August 22, 2006 - v1
Checksum:i888984DAA031E478
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AP008956 Genomic DNA Translation: BAE97204.1
RefSeqiYP_665557.1, NC_008235.1

Genome annotation databases

GeneIDi4178154

Similar proteinsi

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AP008956 Genomic DNA Translation: BAE97204.1
RefSeqiYP_665557.1, NC_008235.1

3D structure databases

ProteinModelPortaliQ14FF8
SMRiQ14FF8
ModBaseiSearch...
MobiDBiSearch...

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi4178154

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
ProtoNetiSearch...

Entry informationi

Entry nameiPSAB_POPAL
AccessioniPrimary (citable) accession number: Q14FF8
Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 6, 2007
Last sequence update: August 22, 2006
Last modified: October 10, 2018
This is version 54 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program

Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families
UniProt is an ELIXIR core data resource
Main funding by: National Institutes of Health

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