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Protein

Proteasome subunit alpha

Gene

psmA

Organism
Thermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Component of the proteasome core, a large protease complex with broad specificity involved in protein degradation. The T.acidophilum proteasome is able to cleave oligopeptides after Tyr, Leu, Phe, and to a lesser extent after Glu and Arg. Thus, displays chymotrypsin-like activity and low level of caspase-like and trypsin-like activities.UniRule annotation1 Publication

Catalytic activityi

Cleavage of peptide bonds with very broad specificity.UniRule annotation1 Publication

Enzyme regulationi

The formation of the proteasomal ATPase PAN-20S proteasome complex, via the docking of the C-termini of PAN into the intersubunit pockets in the alpha-rings, triggers opening of the gate for substrate entry. Interconversion between the open-gate and close-gate conformations leads to a dynamic regulation of the 20S proteasome proteolysis activity.UniRule annotation2 Publications

Kineticsi

  1. KM=39 µM for Suc-LLVY-Amc (at 55 degrees Celsius)1 Publication
  1. Vmax=28 nmol/min/mg enzyme with Suc-LLVY-Amc as substrate (at 55 degrees Celsius)1 Publication

GO - Molecular functioni

  • endopeptidase activity Source: UniProtKB
  • threonine-type endopeptidase activity Source: UniProtKB-HAMAP

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Hydrolase, Protease, Threonine protease

Protein family/group databases

MEROPSiT01.970.

Names & Taxonomyi

Protein namesi
Recommended name:
Proteasome subunit alphaUniRule annotation (EC:3.4.25.1UniRule annotation)
Alternative name(s):
20S proteasome alpha subunitUniRule annotation
Proteasome core protein PsmAUniRule annotation
Gene namesi
Name:psmAUniRule annotation
Ordered Locus Names:Ta1288
OrganismiThermoplasma acidophilum (strain ATCC 25905 / DSM 1728 / JCM 9062 / NBRC 15155 / AMRC-C165)
Taxonomic identifieri273075 [NCBI]
Taxonomic lineageiArchaeaEuryarchaeotaThermoplasmataThermoplasmatalesThermoplasmataceaeThermoplasma
Proteomesi
  • UP000001024 Componenti: Chromosome

Subcellular locationi

  • Cytoplasm UniRule annotation

GO - Cellular componenti

  • cytoplasm Source: UniProtKB-SubCell
  • proteasome core complex, alpha-subunit complex Source: UniProtKB
Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm, Proteasome

Pathology & Biotechi

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Mutagenesisi1 – 12Missing : Markedly increases peptidolytic activity. Designated open-gate mutant. 1 PublicationAdd BLAST12
Mutagenesisi66K → A: Prevents PAN to associate with the proteasome and stimulate gate opening. 1 Publication1
Mutagenesisi81L → A, E or G: Prevents PAN to stimulate gate opening. 1 Publication1
Mutagenesisi82V → A: No effect on PAN's ability to stimulate gate opening. 1 Publication1
Mutagenesisi82V → D or G: Prevents PAN to stimulate gate opening. 1 Publication1

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001241891 – 233Proteasome subunit alphaAdd BLAST233

Post-translational modificationi

The N-terminus is blocked.

Proteomic databases

PRIDEiP25156.

Interactioni

Subunit structurei

The 20S proteasome core is composed of 14 alpha and 14 beta subunits that assemble into four stacked heptameric rings, resulting in a barrel-shaped structure. The two inner rings, each composed of seven catalytic beta subunits, are sandwiched by two outer rings, each composed of seven alpha subunits. The catalytic chamber with the active sites is on the inside of the barrel. Has a gated structure, the ends of the cylinder being occluded by the N-termini of the alpha-subunits. Is capped at one or both ends by the proteasome regulatory ATPase, PAN.UniRule annotation6 Publications

Protein-protein interaction databases

STRINGi273075.Ta1288.

Structurei

Secondary structure

1233
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi22 – 31Combined sources10
Beta strandi37 – 42Combined sources6
Beta strandi45 – 50Combined sources6
Beta strandi57 – 59Combined sources3
Beta strandi61 – 63Combined sources3
Beta strandi66 – 71Combined sources6
Beta strandi74 – 81Combined sources8
Helixi82 – 103Combined sources22
Helixi109 – 122Combined sources14
Turni123 – 125Combined sources3
Beta strandi126 – 129Combined sources4
Beta strandi134 – 141Combined sources8
Beta strandi146 – 151Combined sources6
Beta strandi157 – 166Combined sources10
Helixi169 – 179Combined sources11
Helixi186 – 199Combined sources14
Helixi202 – 204Combined sources3
Beta strandi211 – 216Combined sources6
Beta strandi222 – 224Combined sources3
Helixi226 – 230Combined sources5

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1PMAX-ray3.40A/C/D/E/F/G/H/I/J/K/L/M/N/O1-233[»]
1YA7X-ray2.30A/B/C/D/E/F/G1-233[»]
1YARX-ray1.90A/B/C/D/E/F/G1-233[»]
1YAUX-ray2.40A/B/C/D/E/F/G1-233[»]
2KU1NMR-A/B/C/D/E/F/G1-233[»]
2KU2NMR-A/B/C/D/E/F/G1-233[»]
3C91electron microscopy6.80A/B/C/D/E/F/G/O/P/Q/R/S/T/U1-233[»]
3C92electron microscopy6.80A/B/C/D/E/F/G/O/P/Q/R/S/T/U1-233[»]
3IPMX-ray4.00A/B/C/D/E/F/G1-233[»]
3J9Ielectron microscopy3.30A/B/C/D/E/F/G/O/P/Q/R/S/T/U10-233[»]
3JRMX-ray2.90A/B/C/D/E/F/G7-233[»]
3JSEX-ray2.90A/B/C/D/E/F/G7-233[»]
3JTLX-ray3.20A/B/C/D/E/F/G7-233[»]
ProteinModelPortaliP25156.
SMRiP25156.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiP25156.

Family & Domainsi

Sequence similaritiesi

Belongs to the peptidase T1A family.UniRule annotation

Phylogenomic databases

eggNOGiarCOG00971. Archaea.
COG0638. LUCA.
HOGENOMiHOG000091085.
KOiK03432.
OMAiRNDKQAY.

Family and domain databases

CDDicd03756. proteasome_alpha_archeal. 1 hit.
Gene3Di3.60.20.10. 1 hit.
HAMAPiMF_00289_A. Proteasome_A_A. 1 hit.
InterProiIPR029055. Ntn_hydrolases_N.
IPR019982. Proteasome_asu_arc.
IPR000426. Proteasome_asu_N.
IPR023332. Proteasome_suA-type.
IPR001353. Proteasome_sua/b.
[Graphical view]
PfamiPF00227. Proteasome. 1 hit.
PF10584. Proteasome_A_N. 1 hit.
[Graphical view]
SMARTiSM00948. Proteasome_A_N. 1 hit.
[Graphical view]
SUPFAMiSSF56235. SSF56235. 1 hit.
TIGRFAMsiTIGR03633. arc_protsome_A. 1 hit.
PROSITEiPS00388. PROTEASOME_ALPHA_1. 1 hit.
PS51475. PROTEASOME_ALPHA_2. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

P25156-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MQQGQMAYDR AITVFSPDGR LFQVEYAREA VKKGSTALGM KFANGVLLIS
60 70 80 90 100
DKKVRSRLIE QNSIEKIQLI DDYVAAVTSG LVADARVLVD FARISAQQEK
110 120 130 140 150
VTYGSLVNIE NLVKRVADQM QQYTQYGGVR PYGVSLIFAG IDQIGPRLFD
160 170 180 190 200
CDPAGTINEY KATAIGSGKD AVVSFLEREY KENLPEKEAV TLGIKALKSS
210 220 230
LEEGEELKAP EIASITVGNK YRIYDQEEVK KFL
Length:233
Mass (Da):25,799
Last modified:October 1, 1994 - v2
Checksum:i141A48581DA0DFB5
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X59507 Genomic DNA. Translation: CAA42094.1.
AL445067 Genomic DNA. Translation: CAC12411.1.
PIRiS55350.
RefSeqiWP_010901695.1. NC_002578.1.

Genome annotation databases

EnsemblBacteriaiCAC12411; CAC12411; CAC12411.
GeneIDi1456771.
KEGGitac:Ta1288.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X59507 Genomic DNA. Translation: CAA42094.1.
AL445067 Genomic DNA. Translation: CAC12411.1.
PIRiS55350.
RefSeqiWP_010901695.1. NC_002578.1.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1PMAX-ray3.40A/C/D/E/F/G/H/I/J/K/L/M/N/O1-233[»]
1YA7X-ray2.30A/B/C/D/E/F/G1-233[»]
1YARX-ray1.90A/B/C/D/E/F/G1-233[»]
1YAUX-ray2.40A/B/C/D/E/F/G1-233[»]
2KU1NMR-A/B/C/D/E/F/G1-233[»]
2KU2NMR-A/B/C/D/E/F/G1-233[»]
3C91electron microscopy6.80A/B/C/D/E/F/G/O/P/Q/R/S/T/U1-233[»]
3C92electron microscopy6.80A/B/C/D/E/F/G/O/P/Q/R/S/T/U1-233[»]
3IPMX-ray4.00A/B/C/D/E/F/G1-233[»]
3J9Ielectron microscopy3.30A/B/C/D/E/F/G/O/P/Q/R/S/T/U10-233[»]
3JRMX-ray2.90A/B/C/D/E/F/G7-233[»]
3JSEX-ray2.90A/B/C/D/E/F/G7-233[»]
3JTLX-ray3.20A/B/C/D/E/F/G7-233[»]
ProteinModelPortaliP25156.
SMRiP25156.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi273075.Ta1288.

Protein family/group databases

MEROPSiT01.970.

Proteomic databases

PRIDEiP25156.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiCAC12411; CAC12411; CAC12411.
GeneIDi1456771.
KEGGitac:Ta1288.

Phylogenomic databases

eggNOGiarCOG00971. Archaea.
COG0638. LUCA.
HOGENOMiHOG000091085.
KOiK03432.
OMAiRNDKQAY.

Miscellaneous databases

EvolutionaryTraceiP25156.

Family and domain databases

CDDicd03756. proteasome_alpha_archeal. 1 hit.
Gene3Di3.60.20.10. 1 hit.
HAMAPiMF_00289_A. Proteasome_A_A. 1 hit.
InterProiIPR029055. Ntn_hydrolases_N.
IPR019982. Proteasome_asu_arc.
IPR000426. Proteasome_asu_N.
IPR023332. Proteasome_suA-type.
IPR001353. Proteasome_sua/b.
[Graphical view]
PfamiPF00227. Proteasome. 1 hit.
PF10584. Proteasome_A_N. 1 hit.
[Graphical view]
SMARTiSM00948. Proteasome_A_N. 1 hit.
[Graphical view]
SUPFAMiSSF56235. SSF56235. 1 hit.
TIGRFAMsiTIGR03633. arc_protsome_A. 1 hit.
PROSITEiPS00388. PROTEASOME_ALPHA_1. 1 hit.
PS51475. PROTEASOME_ALPHA_2. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiPSA_THEAC
AccessioniPrimary (citable) accession number: P25156
Entry historyi
Integrated into UniProtKB/Swiss-Prot: May 1, 1992
Last sequence update: October 1, 1994
Last modified: November 2, 2016
This is version 137 of the entry and version 2 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Miscellaneous

The configuration of the closed gate contains an opening large enough to allow rapid entry of tetrapeptides but able to impede the entry of proteins and longer peptides.

Keywords - Technical termi

3D-structure, Complete proteome, Direct protein sequencing, Reference proteome

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. Peptidase families
    Classification of peptidase families and list of entries
  3. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.