ID   PSB_SACEN               Reviewed;         284 AA.
AC   A4FBY1;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   17-APR-2007, sequence version 1.
DT   25-MAY-2022, entry version 83.
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=SACE_2251;
OS   Saccharopolyspora erythraea (strain ATCC 11635 / DSM 40517 / JCM 4748 /
OS   NBRC 13426 / NCIMB 8594 / NRRL 2338).
OC   Bacteria; Actinobacteria; Pseudonocardiales; Pseudonocardiaceae;
OC   Saccharopolyspora.
OX   NCBI_TaxID=405948;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 11635 / DSM 40517 / JCM 4748 / NBRC 13426 / NCIMB 8594 / NRRL
RC   2338;
RX   PubMed=17369815; DOI=10.1038/nbt1297;
RA   Oliynyk M., Samborskyy M., Lester J.B., Mironenko T., Scott N., Dickens S.,
RA   Haydock S.F., Leadlay P.F.;
RT   "Complete genome sequence of the erythromycin-producing bacterium
RT   Saccharopolyspora erythraea NRRL23338.";
RL   Nat. Biotechnol. 25:447-453(2007).
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; AM420293; CAM01556.1; -; Genomic_DNA.
DR   AlphaFoldDB; A4FBY1; -.
DR   SMR; A4FBY1; -.
DR   STRING; 405948.SACE_2251; -.
DR   MEROPS; T01.005; -.
DR   EnsemblBacteria; CAM01556; CAM01556; SACE_2251.
DR   KEGG; sen:SACE_2251; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OMA; NLGMAMQ; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000006728; 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   Reference proteome; Threonine protease; Zymogen.
FT   PROPEP          1..56
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397572"
FT   CHAIN           57..284
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397573"
FT   ACT_SITE        57
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   284 AA;  29828 MW;  13A121F4FA79D892 CRC64;
     MSPMESSSTR FPGQALPAAY LTPGSSSFTD FLRVAAPELM PGSRPVPDGA VEAPHGTTIV
     ALTFRGGVLL AGDRRATMGN LIAQRDMEKL YVTDDYSAVG IAGTAGIALE MVRLYAIELE
     HYEKLEGVSL SLDGKANKLA TMLRGNLQGA MAGLAVLPLF AGFDVDADDP DRAGRIVSYD
     ITGGRYNELG GYYAVGSGSL FAKSALKKRF DPDADVDTAV RAAVEALYDA ADDDTATGGP
     DLSRRIYPSI ITITGTDGAT RVPEERAAEI ATEVVNGRMQ NPGG