ID   PSB_ACIFD               Reviewed;         273 AA.
AC   C7LYP7;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   13-OCT-2009, sequence version 1.
DT   03-AUG-2022, entry version 62.
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=Afer_0910;
OS   Acidimicrobium ferrooxidans (strain DSM 10331 / JCM 15462 / NBRC 103882 /
OS   ICP).
OC   Bacteria; Actinobacteria; Acidimicrobiia; Acidimicrobiales;
OC   Acidimicrobiaceae; Acidimicrobium.
OX   NCBI_TaxID=525909;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 10331 / JCM 15462 / NBRC 103882 / ICP;
RX   PubMed=21304635; DOI=10.4056/sigs.1463;
RA   Clum A., Nolan M., Lang E., Glavina Del Rio T., Tice H., Copeland A.,
RA   Cheng J.F., Lucas S., Chen F., Bruce D., Goodwin L., Pitluck S.,
RA   Ivanova N., Mavrommatis K., Mikhailova N., Pati A., Chen A.,
RA   Palaniappan K., Goker M., Spring S., Land M., Hauser L., Chang Y.J.,
RA   Jeffries C.C., Chain P., Bristow J., Eisen J.A., Markowitz V.,
RA   Hugenholtz P., Kyrpides N.C., Klenk H.P., Lapidus A.;
RT   "Complete genome sequence of Acidimicrobium ferrooxidans type strain
RT   (ICP).";
RL   Stand. Genomic Sci. 1:38-45(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; CP001631; ACU53855.1; -; Genomic_DNA.
DR   RefSeq; WP_015798344.1; NC_013124.1.
DR   AlphaFoldDB; C7LYP7; -.
DR   SMR; C7LYP7; -.
DR   STRING; 525909.Afer_0910; -.
DR   MEROPS; T01.005; -.
DR   PRIDE; C7LYP7; -.
DR   EnsemblBacteria; ACU53855; ACU53855; Afer_0910.
DR   KEGG; afo:Afer_0910; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OMA; NLGMAMQ; -.
DR   OrthoDB; 1129370at2; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000000771; 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..50
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397488"
FT   CHAIN           51..273
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397489"
FT   ACT_SITE        51
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   273 AA;  29247 MW;  1E36228758D8D6B1 CRC64;
     MRKDGARLAL PLFDPRHDPG PDFAALVSRD AARTVPTSGD GSLGAQVPHG TTIAALRFAG
     GVVIAGDRRA TEGNFIANRT IEKVFPADRF SGVGIAGAAG PAVEMVRIFQ VQLEHYEKVE
     GKALSLEGKA NQLAQMIRQN LPLAMQGLVV MPLFAGWDAE RSEGRIFTFD VAGGRYEEVA
     YYAIGSGGRD ARATLKLGWR PGLDEAGAVH LAVQALYEAA QEDAATGGPD ALRGIFPVVA
     VIDREGYRRI DDARLEEIAV ELDQAVRERG ARR