O24362 (PSA3_SPIOL) Reviewed, UniProtKB/Swiss-Prot

Names and origin

Protein names

Recommended name:
Proteasome subunit alpha type-3
EC=3.4.25.1

Alternative name(s):
20S proteasome alpha subunit G
20S proteasome subunit alpha-7
Proteasome component C8

Gene names

Name:	PAG1
Synonyms:	PSC8

Organism

Spinacia oleracea (Spinach)

Taxonomic identifier

3562 [NCBI]

Taxonomic lineage

Eukaryota › Viridiplantae › Streptophyta › Embryophyta › Tracheophyta › Spermatophyta › Magnoliophyta › eudicotyledons › core eudicotyledons › Caryophyllales › Amaranthaceae › Spinacia

Protein attributes

Sequence length	249 AA.
Sequence status	Complete.
Protein existence	Evidence at transcript level

General annotation (Comments)

Function	The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity.
Catalytic activity	Cleavage of peptide bonds with very broad specificity.
Subunit structure	The 26S proteasome consists of a 20S proteasome core and two 19S regulatory subunits. The 20S proteasome core is composed of 28 subunits that are arranged in four stacked rings, resulting in a barrel-shaped structure. The two end rings are each formed by seven alpha subunits, and the two central rings are each formed by seven beta subunits. The catalytic chamber with the active sites is on the inside of the barrel.
Subcellular location	Cytoplasm By similarity. Nucleus By similarity.
Sequence similarities	Belongs to the peptidase T1A family.

Ontologies

Keywords
Cellular component	Cytoplasm Nucleus Proteasome
Molecular function	Hydrolase Protease Threonine protease
Gene Ontology (GO)
Biological process	ubiquitin-dependent protein catabolic process Inferred from electronic annotation. Source: InterPro
Cellular component	cytoplasm Inferred from electronic annotation. Source: UniProtKB-SubCell nucleus Inferred from electronic annotation. Source: UniProtKB-SubCell proteasome core complex, alpha-subunit complex Inferred from electronic annotation. Source: InterPro
Molecular function	threonine-type endopeptidase 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 – 249	249	Proteasome subunit alpha type-3		PRO_0000124100

Sequences

	Sequence		Length	Mass (Da)
	O24362 [UniParc]. Last modified January 1, 1998. Version 1. Checksum: 8B7DB2B4D74FB3FA	FASTA	249	27,285
	10 20 30 40 50 60 MSSIGTGYDL SVTTFSPDGR VFQIEYAAKA VDNSGTAVGI KCKDGIVLGV EKLIQSKMML 70 80 90 100 110 120 PGSNRRIHSV HRHSGMAVAG LAADGRQIVA RAKSEATNYE SVYGEAVPVK ELADRVASYV 130 140 150 160 170 180 HLCTLYWWLR PFGCGVILGG YDRDGPQLYM VEPSGISYRY FGAAIGKGKQ AAKTEIEKLK 190 200 210 220 230 240 LSEMTCREGI IEVAKIIYKV HDEAKDKAFE LEMSWICDES KREHQKVPDN LLQEAKAAAT AALEEMDAD

References

[1]	"Characterization of 26S proteasome alpha- and beta-type and ATPase subunits from spinach and their expression during early stages of seedling development." Ito N., Tomizawa K., Tanaka K., Matsui M., Kendrick R.E., Sato T., Nakagawa H. Plant Mol. Biol. 34:307-316(1997) [PubMed: 9207846] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA].
+	Additional computationally mapped references.

Cross-references

Sequence databases
EMBL GenBank DDBJ	D78173 mRNA. Translation: BAA21651.1.
PIR	T09139.
3D structure databases
ProteinModelPortal	O24362.
SMR	O24362. Positions 2-245.
ModBase	Search...
Protein family/group databases
MEROPS	T01.977.
Proteomic databases
PRIDE	O24362.
Protocols and materials databases
StructuralBiologyKnowledgebase	Search...
Family and domain databases
InterPro	IPR000426. Proteasome_asu_N. IPR023332. Proteasome_suA-type. IPR001353. Proteasome_sua/b. [Graphical view]
Pfam	PF00227. Proteasome. 1 hit. PF10584. Proteasome_A_N. 1 hit. [Graphical view]
SMART	SM00948. Proteasome_A_N. 1 hit. [Graphical view]
PROSITE	PS00388. PROTEASOME_A_1. 1 hit. PS51475. PROTEASOME_A_2. 1 hit. [Graphical view]
ProtoNet	Search...

Entry information

Entry name

PSA3_SPIOL

Accession

Primary (citable) accession number: O24362

Entry history

Integrated into UniProtKB/Swiss-Prot:	December 15, 1998
Last sequence update:	January 1, 1998
Last modified:	January 25, 2012
This is version 66 of the entry and version 1 of the sequence. [Complete history]

Entry status

Reviewed (UniProtKB/Swiss-Prot)

Annotation program

Plant Protein Annotation Program