ID   PSB_MYCA9               Reviewed;         292 AA.
AC   B1MAI2;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   29-APR-2008, sequence version 1.
DT   03-AUG-2022, entry version 78.
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=MAB_2172;
OS   Mycobacteroides abscessus (strain ATCC 19977 / DSM 44196 / CIP 104536 / JCM
OS   13569 / NCTC 13031 / TMC 1543) (Mycobacterium abscessus).
OC   Bacteria; Actinobacteria; Corynebacteriales; Mycobacteriaceae;
OC   Mycobacteroides; Mycobacteroides abscessus.
OX   NCBI_TaxID=561007;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 19977 / DSM 44196 / CIP 104536 / JCM 13569 / NCTC 13031 / TMC
RC   1543;
RX   PubMed=19543527; DOI=10.1371/journal.pone.0005660;
RA   Ripoll F., Pasek S., Schenowitz C., Dossat C., Barbe V., Rottman M.,
RA   Macheras E., Heym B., Herrmann J.L., Daffe M., Brosch R., Risler J.L.,
RA   Gaillard J.L.;
RT   "Non mycobacterial virulence genes in the genome of the emerging pathogen
RT   Mycobacterium abscessus.";
RL   PLoS ONE 4:E5660-E5660(2009).
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}.
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DR   EMBL; CU458896; CAM62253.1; -; Genomic_DNA.
DR   RefSeq; WP_005080106.1; NZ_MLCG01000002.1.
DR   AlphaFoldDB; B1MAI2; -.
DR   SMR; B1MAI2; -.
DR   MEROPS; T01.005; -.
DR   PRIDE; B1MAI2; -.
DR   EnsemblBacteria; CAM62253; CAM62253; MAB_2172.
DR   GeneID; 66972543; -.
DR   KEGG; mab:MAB_2172; -.
DR   OMA; NLGMAMQ; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000007137; 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; IPR001353; Proteasome_sua/b.
DR   InterPro; IPR023333; Proteasome_suB-type.
DR   InterPro; IPR022483; PSB_actinobac.
DR   Pfam; PF00227; Proteasome; 1.
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   Threonine protease; Zymogen.
FT   PROPEP          1..54
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397520"
FT   CHAIN           55..292
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397521"
FT   ACT_SITE        55
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   292 AA;  30881 MW;  CB400F788C12C1AF CRC64;
     MIWRDDAIAS QPAGQHFRNS HLSSFSEYLR AQAPELLPAL GKASADVIGN LPHGTTIVAL
     TYRGGVLIAG DRRATQGNYI ANRDIDKVQI TDNYSATGIA GTAAIAVEFA RLYAVELEHY
     EKLEGVQLTF NGKANRLSAL VRGNLAAAMQ GLVAVPLLVG YDLDDPNGET AGRIVSFDVA
     GGWHVESDGY QAVGSGSVFA KSSIKKLYRP GGDALTALAV AVEALYDAAD DDSATGGPDL
     VRRVFPTAIR IDSGGAVRVP EADIERIARE VIAKRTEAAR EEADLRESGG DS