P14627 (PSAK_SPIOL) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Photosystem I reaction center subunit psaK, chloroplastic

Alternative name(s):
Light-harvesting 5 kDa protein
PSI-K
Photosystem I subunit X

Gene names

Name:

PSAK

Organism

Spinacia oleracea (Spinach)

Taxonomic identifier

3562 [NCBI]

Taxonomic lineage

cellular organisms › Eukaryota › Viridiplantae › Streptophyta › Streptophytina › Embryophyta › Tracheophyta › Euphyllophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › Caryophyllales › Amaranthaceae › Spinacia

Protein attributes

Sequence length	29 AA.
Sequence status	Fragment.
Protein existence	Evidence at protein level

General annotation (Comments)

Subcellular location	Plastid › chloroplast thylakoid membrane; Multi-pass membrane protein Probable.
Sequence similarities	Belongs to the PsaG/PsaK family.

Ontologies

Keywords
Biological process	Photosynthesis
Cellular component	Chloroplast Membrane Photosystem I Plastid Thylakoid
Domain	Transmembrane Transmembrane helix
Technical term	Direct protein sequencing
Gene Ontology (GO)
Biological_process	photosynthesis Inferred from electronic annotation. Source: UniProtKB-KW
Cellular_component	chloroplast thylakoid membrane Inferred from electronic annotation. Source: UniProtKB-SubCell integral to membrane Inferred from electronic annotation. Source: UniProtKB-KW photosystem I Inferred from electronic annotation. Source: UniProtKB-KW
Molecular_function	chlorophyll binding Inferred from electronic annotation. Source: InterPro
Complete GO annotation...

Sequence annotation (Features)

	Feature key	Position(s)	Length	Description	Graphical view	Feature identifier
Molecule processing
	Chain	1 – ›29	›29	Photosystem I reaction center subunit psaK, chloroplastic		PRO_0000206211
Regions
	Transmembrane	3 – 23	21	Helical; Potential
Experimental info
	Non-terminal residue	29	1

Sequences

	Sequence		Length	Mass (Da)
	P14627 [UniParc]. Last modified August 1, 1990. Version 2. Checksum: 38AECD218210B24D	FASTA	29	3,059
	10 20 GDFIGSSTNL IMVTSTTLML FAGRFGLXP

References

[1]	"Characterization and N-terminal sequence of a 5 kDa polypeptide in the photosystem I core complex from spinach." Hoshina S., Sue S., Kunishima N., Kamide K., Wada K., Itoh S. FEBS Lett. 258:305-308(1989) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE.
[2]	"Polypeptide composition of higher plant photosystem I complex. Identification of psaI, psaJ and psaK gene products." Ikeuchi M., Hirano A., Hiyama T., Inoue Y. FEBS Lett. 263:274-278(1990) [PubMed] [Europe PMC] [Abstract] Cited for: PROTEIN SEQUENCE OF 1-27.
[3]	"The photosystem I 5.5 kDa subunit (the psaK gene product). An intrinsic subunit of the PSI reaction center complex." Wynn R.M., Malkin R. FEBS Lett. 262:45-48(1990) Cited for: PROTEIN SEQUENCE OF 1-10.

Cross-references

Sequence databases
PIR	S07055. S09734.
3D structure databases
ModBase	Search...
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
Gene3D	1.10.286.40. 1 hit.
InterPro	IPR000549. PSI_PsaG/PsaK. IPR023618. PSI_PsaG/PsaK_dom. [Graphical view]
Pfam	PF01241. PSI_PSAK. 1 hit. [Graphical view]
PROSITE	PS01026. PHOTOSYSTEM_I_PSAGK. Partial match. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

PSAK_SPIOL

Accession

Primary (citable) accession number: P14627

Entry history

Integrated into UniProtKB/Swiss-Prot:	April 1, 1990
Last sequence update:	August 1, 1990
Last modified:	April 3, 2013
This is version 67 of the entry and version 2 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program