ID   PSB_METB6               Reviewed;         213 AA.
AC   A7I841;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   11-SEP-2007, sequence version 1.
DT   25-MAY-2022, entry version 81.
DE   RecName: Full=Proteasome subunit beta {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 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   AltName: Full=Proteasome core protein PsmB {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=psmB {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=Mboo_1384;
OS   Methanoregula boonei (strain DSM 21154 / JCM 14090 / 6A8).
OC   Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia;
OC   Methanomicrobiales; Methanoregulaceae; Methanoregula.
OX   NCBI_TaxID=456442;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 21154 / JCM 14090 / 6A8;
RX   PubMed=25998264; DOI=10.1099/mic.0.000117;
RA   Braeuer S., Cadillo-Quiroz H., Kyrpides N., Woyke T., Goodwin L.,
RA   Detter C., Podell S., Yavitt J.B., Zinder S.H.;
RT   "Genome of Methanoregula boonei 6A8 reveals adaptations to oligotrophic
RT   peatland environments.";
RL   Microbiology 161:1572-1581(2015).
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; CP000780; ABS55902.1; -; Genomic_DNA.
DR   RefSeq; WP_012106935.1; NC_009712.1.
DR   AlphaFoldDB; A7I841; -.
DR   SMR; A7I841; -.
DR   STRING; 456442.Mboo_1384; -.
DR   MEROPS; T01.002; -.
DR   EnsemblBacteria; ABS55902; ABS55902; Mboo_1384.
DR   GeneID; 5412034; -.
DR   KEGG; mbn:Mboo_1384; -.
DR   eggNOG; arCOG00970; Archaea.
DR   HOGENOM; CLU_035750_7_2_2; -.
DR   OMA; VDKTGPH; -.
DR   OrthoDB; 89767at2157; -.
DR   Proteomes; UP000002408; 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   CDD; cd03764; proteasome_beta_archeal; 1.
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; IPR016050; Proteasome_bsu_CS.
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; PS00854; PROTEASOME_BETA_1; 1.
DR   PROSITE; PS51476; PROTEASOME_BETA_2; 1.
PE   3: Inferred from homology;
KW   Autocatalytic cleavage; Cytoplasm; Hydrolase; Protease; Proteasome;
KW   Reference proteome; Threonine protease; Zymogen.
FT   PROPEP          1..11
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397364"
FT   CHAIN           12..213
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397365"
FT   ACT_SITE        12
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   213 AA;  23165 MW;  DD969D8BB4AE19EA CRC64;
     MPEQYQESMT GTTTVGLVFA GGVILATEKR ATMGYMIASK RAKKVYQIAD RIGMTIAGGV
     GDAQQLARII TVECNLYQIR RSREITVGAA STLLSNYLNQ NRYFPYYVQL LVGGIDDHGP
     SVYSVDAMGG ATKEEDIVST GSGSPMAYGV LEDRYRPGMN EDEAVELAVR ALRSAMKRDA
     GSGEGIHVVV ITKDRYENVS EETIKKHLAK TIA