ID   PSB_SALAI               Reviewed;         279 AA.
AC   A8M2A3;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   04-DEC-2007, sequence version 1.
DT   27-MAR-2024, entry version 80.
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};
GN   OrderedLocusNames=Sare_2361;
OS   Salinispora arenicola (strain CNS-205).
OC   Bacteria; Actinomycetota; Actinomycetes; Micromonosporales;
OC   Micromonosporaceae; Salinispora.
OX   NCBI_TaxID=391037;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CNS-205;
RG   US DOE Joint Genome Institute;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Glavina del Rio T., Dalin E.,
RA   Tice H., Pitluck S., Foster B., Schmutz J., Larimer F., Land M., Hauser L.,
RA   Kyrpides N., Ivanova N., Jensen P.R., Moore B.S., Penn K., Jenkins C.,
RA   Udwary D., Xiang L., Gontang E., Richardson P.;
RT   "Complete sequence of Salinispora arenicola CNS-205.";
RL   Submitted (OCT-2007) to the EMBL/GenBank/DDBJ databases.
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; CP000850; ABV98219.1; -; Genomic_DNA.
DR   AlphaFoldDB; A8M2A3; -.
DR   SMR; A8M2A3; -.
DR   STRING; 391037.Sare_2361; -.
DR   MEROPS; T01.005; -.
DR   KEGG; saq:Sare_2361; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   UniPathway; UPA00997; -.
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   CDD; cd01906; proteasome_protease_HslV; 1.
DR   Gene3D; 3.60.20.10; Glutamine Phosphoribosylpyrophosphate, subunit 1, domain 1; 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   NCBIfam; TIGR03690; 20S_bact_beta; 1.
DR   PANTHER; PTHR32194:SF0; ATP-DEPENDENT PROTEASE SUBUNIT HSLV; 1.
DR   PANTHER; PTHR32194; METALLOPROTEASE TLDD; 1.
DR   Pfam; PF00227; Proteasome; 1.
DR   SUPFAM; SSF56235; N-terminal nucleophile aminohydrolases (Ntn hydrolases); 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..53
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397574"
FT   CHAIN           54..279
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397575"
FT   ACT_SITE        54
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   279 AA;  28939 MW;  BAD51C42468301C9 CRC64;
     MAAAFDPSGR LPDLFTSAGT SSFSAFLSMA APELLPGRRP LPPGTAADLT PHATTIVAIA
     AAGGVVMAGD RRATMGNLIA QRDIEKVYPA DAYSLVGMAG AAGIGIELIR LFQVELEHYE
     KIEGAMLSLD GKANRLAAMV RGNLGAAMQG LAVVPMFAGF DLAANDPVKA GRIFSFDVTG
     GPYEETGYDA VGSGSLFAKS ALKKRFRVGL SVDDAMRLAV EALYDAADDD TATGGPDLTR
     RIYPVVMTVT AEGTHRLTEA ETAAIAENVV AGRMENPGG
//