ID   PSB_FRAAA               Reviewed;         274 AA.
AC   Q0RLT7;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   10-AUG-2010, sequence version 2.
DT   25-MAY-2022, entry version 84.
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=FRAAL2873;
OS   Frankia alni (strain ACN14a).
OC   Bacteria; Actinobacteria; Frankiales; Frankiaceae; Frankia.
OX   NCBI_TaxID=326424;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ACN14a;
RX   PubMed=17151343; DOI=10.1101/gr.5798407;
RA   Normand P., Lapierre P., Tisa L.S., Gogarten J.P., Alloisio N.,
RA   Bagnarol E., Bassi C.A., Berry A.M., Bickhart D.M., Choisne N., Couloux A.,
RA   Cournoyer B., Cruveiller S., Daubin V., Demange N., Francino M.P.,
RA   Goltsman E., Huang Y., Kopp O.R., Labarre L., Lapidus A., Lavire C.,
RA   Marechal J., Martinez M., Mastronunzio J.E., Mullin B.C., Niemann J.,
RA   Pujic P., Rawnsley T., Rouy Z., Schenowitz C., Sellstedt A., Tavares F.,
RA   Tomkins J.P., Vallenet D., Valverde C., Wall L.G., Wang Y., Medigue C.,
RA   Benson D.R.;
RT   "Genome characteristics of facultatively symbiotic Frankia sp. strains
RT   reflect host range and host plant biogeography.";
RL   Genome Res. 17:7-15(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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=CAJ61517.1; Type=Erroneous initiation; Note=Truncated N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; CT573213; CAJ61517.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; Q0RLT7; -.
DR   SMR; Q0RLT7; -.
DR   STRING; 326424.FRAAL2873; -.
DR   MEROPS; T01.005; -.
DR   KEGG; fal:FRAAL2873; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000000657; 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..52
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397504"
FT   CHAIN           53..274
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397505"
FT   ACT_SITE        53
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   274 AA;  28806 MW;  DE3BF24401FEBF5C CRC64;
     MADPMGGAGR LPAVFMTPGT SSFTDFLSQS APHLLPGARG GLPGPVTEVA HGTTIVAVTF
     PGGVIMAGDR RATQGHMIAQ RDVEKVHHAD DFSCVGYAGT AGVGAELIRL FQVELEHYEK
     IEGATLSLDA KANRLAAMVK GNLPMALQGL AVVPLFAGYD PDLDKGRIFS YDIAAAKSEE
     RTYESIGSGS VFAKGSLKKR FRVDLTQDDA VRIAVEALYD AADDDSATGG PDTIRKLYPI
     VASVTSDGYR RYGDDEVEPV VTAIIADRST SAGG