ID   PSB_PAEAT               Reviewed;         269 AA.
AC   A1R6Q7;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   10-AUG-2010, sequence version 2.
DT   03-AUG-2022, entry version 102.
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 PrcB {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=prcB {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=AAur_2177;
OS   Paenarthrobacter aurescens (strain TC1).
OC   Bacteria; Actinobacteria; Micrococcales; Micrococcaceae; Paenarthrobacter.
OX   NCBI_TaxID=290340;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=TC1;
RX   PubMed=17194220; DOI=10.1371/journal.pgen.0020214;
RA   Mongodin E.F., Shapir N., Daugherty S.C., DeBoy R.T., Emerson J.B.,
RA   Shvartzbeyn A., Radune D., Vamathevan J., Riggs F., Grinberg V.,
RA   Khouri H.M., Wackett L.P., Nelson K.E., Sadowsky M.J.;
RT   "Secrets of soil survival revealed by the genome sequence of Arthrobacter
RT   aurescens TC1.";
RL   PLoS Genet. 2:2094-2106(2006).
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 ARC-20S
CC       proteasome complex, likely via the docking of the C-termini of ARC into
CC       the intersubunit pockets in the alpha-rings, may trigger opening of the
CC       gate for substrate entry. Interconversion between the open-gate and
CC       close-gate conformations leads to a dynamic regulation of the 20S
CC       proteasome proteolysis activity. {ECO:0000255|HAMAP-Rule:MF_02113}.
CC   -!- PATHWAY: Protein degradation; proteasomal Pup-dependent pathway.
CC       {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 by the proteasome-associated ATPase, ARC. {ECO:0000255|HAMAP-
CC       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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=ABM08407.1; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; CP000474; ABM08407.1; ALT_INIT; Genomic_DNA.
DR   RefSeq; WP_043806103.1; NC_008711.1.
DR   AlphaFoldDB; A1R6Q7; -.
DR   SMR; A1R6Q7; -.
DR   STRING; 290340.AAur_2177; -.
DR   MEROPS; T01.005; -.
DR   EnsemblBacteria; ABM08407; ABM08407; AAur_2177.
DR   KEGG; aau:AAur_2177; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OrthoDB; 1129370at2; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000000637; 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:0019941; P:modification-dependent protein catabolic process; 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_B; Proteasome_B_B; 1.
DR   InterPro; IPR029055; Ntn_hydrolases_N.
DR   InterPro; IPR000243; Pept_T1A_subB.
DR   InterPro; IPR001353; Proteasome_sua/b.
DR   InterPro; IPR023333; Proteasome_suB-type.
DR   InterPro; IPR022483; PSB_actinobac.
DR   Pfam; PF00227; Proteasome; 1.
DR   PRINTS; PR00141; PROTEASOME.
DR   SUPFAM; SSF56235; SSF56235; 1.
DR   TIGRFAMs; TIGR03690; 20S_bact_beta; 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..46
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397494"
FT   CHAIN           47..269
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397495"
FT   ACT_SITE        47
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   269 AA;  28625 MW;  B4B84D6E538EA415 CRC64;
     MQDPSTGPLA TQATSSFTEH LQRSRPELLP FNQLLPAGTV PSSPHATTIV ALTYAGGVLM
     AGDRRATMGN IIASRHIEKV FPADEYSVLG IAGTAGLAID ITRLFQVELE HYEKIEGTLL
     SLVGKANRLG AMIRGNLPMA MQGMAVIPLF AGFDQVAGVG RLFSYDVTGG RYEELEHHSV
     GSGSVFARGA LKKLWKPNLS EEDAISVAVE ALYDAADDDS ATGGPDPVRQ LWPVVYTVNR
     SGNRRVPERD LAAVAGAIVE SRAVAGREA