ID   PSB1_SULAC              Reviewed;         195 AA.
AC   Q4JAY3;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   02-AUG-2005, sequence version 1.
DT   25-MAY-2022, entry version 88.
DE   RecName: Full=Proteasome subunit beta 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE            EC=3.4.25.1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   AltName: Full=20S proteasome beta subunit 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   AltName: Full=Proteasome core protein PsmB 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=psmB1 {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=Saci_0662;
OS   Sulfolobus acidocaldarius (strain ATCC 33909 / DSM 639 / JCM 8929 / NBRC
OS   15157 / NCIMB 11770).
OC   Archaea; Crenarchaeota; Thermoprotei; Sulfolobales; Sulfolobaceae;
OC   Sulfolobus.
OX   NCBI_TaxID=330779;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 33909 / DSM 639 / JCM 8929 / NBRC 15157 / NCIMB 11770;
RX   PubMed=15995215; DOI=10.1128/jb.187.14.4992-4999.2005;
RA   Chen L., Bruegger K., Skovgaard M., Redder P., She Q., Torarinsson E.,
RA   Greve B., Awayez M., Zibat A., Klenk H.-P., Garrett R.A.;
RT   "The genome of Sulfolobus acidocaldarius, a model organism of the
RT   Crenarchaeota.";
RL   J. Bacteriol. 187:4992-4999(2005).
CC   -!- FUNCTION: Component of the proteasome core, a large protease complex
CC       with broad specificity involved in protein degradation.
CC       {ECO:0000255|HAMAP-Rule:MF_02113}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Cleavage of peptide bonds with very broad specificity.;
CC         EC=3.4.25.1; Evidence={ECO:0000255|HAMAP-Rule:MF_02113};
CC   -!- ACTIVITY REGULATION: The formation of the proteasomal ATPase PAN-20S
CC       proteasome complex, via the docking of the C-termini of PAN into the
CC       intersubunit pockets in the alpha-rings, triggers opening of the gate
CC       for substrate entry. Interconversion between the open-gate and close-
CC       gate conformations leads to a dynamic regulation of the 20S proteasome
CC       proteolysis activity. {ECO:0000255|HAMAP-Rule:MF_02113}.
CC   -!- SUBUNIT: The 20S proteasome core is composed of 14 alpha and 14 beta
CC       subunits that assemble into four stacked heptameric rings, resulting in
CC       a barrel-shaped structure. The two inner rings, each composed of seven
CC       catalytic beta subunits, are sandwiched by two outer rings, each
CC       composed of seven alpha subunits. The catalytic chamber with the active
CC       sites is on the inside of the barrel. Has a gated structure, the ends
CC       of the cylinder being occluded by the N-termini of the alpha-subunits.
CC       Is capped at one or both ends by the proteasome regulatory ATPase, PAN.
CC       {ECO:0000255|HAMAP-Rule:MF_02113}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_02113}.
CC   -!- SIMILARITY: Belongs to the peptidase T1B family. {ECO:0000255|HAMAP-
CC       Rule:MF_02113}.
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DR   EMBL; CP000077; AAY80046.1; -; Genomic_DNA.
DR   RefSeq; WP_011277548.1; NC_007181.1.
DR   PDB; 6Z46; X-ray; 3.70 A; H/I/J/K/L/M/N/V/W/X/Y/Z/a/b=7-195.
DR   PDBsum; 6Z46; -.
DR   AlphaFoldDB; Q4JAY3; -.
DR   SMR; Q4JAY3; -.
DR   STRING; 330779.Saci_0662; -.
DR   EnsemblBacteria; AAY80046; AAY80046; Saci_0662.
DR   GeneID; 3473233; -.
DR   KEGG; sai:Saci_0662; -.
DR   PATRIC; fig|330779.12.peg.632; -.
DR   eggNOG; arCOG00970; Archaea.
DR   HOGENOM; CLU_035750_7_2_2; -.
DR   OMA; RVSYGFY; -.
DR   Proteomes; UP000001018; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0019774; C:proteasome core complex, beta-subunit complex; IEA:UniProtKB-UniRule.
DR   GO; GO:0004298; F:threonine-type endopeptidase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0010498; P:proteasomal protein catabolic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.60.20.10; -; 1.
DR   HAMAP; MF_02113_A; Proteasome_B_A; 1.
DR   InterPro; IPR029055; Ntn_hydrolases_N.
DR   InterPro; IPR019983; Pept_T1A_Psome_bsu_arc.
DR   InterPro; IPR000243; Pept_T1A_subB.
DR   InterPro; IPR001353; Proteasome_sua/b.
DR   InterPro; IPR023333; Proteasome_suB-type.
DR   Pfam; PF00227; Proteasome; 1.
DR   PRINTS; PR00141; PROTEASOME.
DR   SUPFAM; SSF56235; SSF56235; 1.
DR   TIGRFAMs; TIGR03634; arc_protsome_B; 1.
DR   PROSITE; PS51476; PROTEASOME_BETA_2; 1.
PE   1: Evidence at protein level;
KW   3D-structure; Autocatalytic cleavage; Cytoplasm; Hydrolase; Protease;
KW   Proteasome; Reference proteome; Threonine protease; Zymogen.
FT   PROPEP          1..6
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397424"
FT   CHAIN           7..195
FT                   /note="Proteasome subunit beta 1"
FT                   /id="PRO_0000397425"
FT   ACT_SITE        7
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   195 AA;  21231 MW;  6BB6312EF6AEEF94 CRC64;
     MEELPATAIG IKTKDGVVLA AERRLSYGDF VLSKSARKVF KLGRFGIAGA GIVGDIQTLT
     RIMNVEIKYY EMYNSRKISA RAAAKLLSVI LYQNKVLPYI SELLFGGVDE DGPKLFILDP
     IGSLIEDSYA AVGSGARVAI GVLEAEYNES LTSEAAKELA IKSMKSAVER DVMSGDGIDI
     LIINKNNIYE DFIKI