ID   PSB_NAKMY               Reviewed;         288 AA.
AC   C8XAQ4;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   03-NOV-2009, sequence version 1.
DT   25-MAY-2022, entry version 56.
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=Namu_2969;
OS   Nakamurella multipartita (strain ATCC 700099 / DSM 44233 / CIP 104796 / JCM
OS   9543 / NBRC 105858 / Y-104) (Microsphaera multipartita).
OC   Bacteria; Actinobacteria; Nakamurellales; Nakamurellaceae; Nakamurella.
OX   NCBI_TaxID=479431;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 700099 / DSM 44233 / CIP 104796 / JCM 9543 / NBRC 105858 /
RC   Y-104;
RG   US DOE Joint Genome Institute (JGI-PGF);
RA   Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA   Bruce D., Goodwin L., Pitluck S., Kyrpides N., Mavromatis K., Ivanova N.,
RA   Ovchinnikova G., Sims D., Meincke L., Brettin T., Detter J.C., Han C.,
RA   Larimer F., Land M., Hauser L., Markowitz V., Cheng J.-F., Hugenholtz P.,
RA   Woyke T., Wu D., Klenk H.-P., Eisen J.A.;
RT   "The complete genome of Nakamurella multipartita DSM 44233.";
RL   Submitted (SEP-2009) 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; CP001737; ACV79307.1; -; Genomic_DNA.
DR   AlphaFoldDB; C8XAQ4; -.
DR   SMR; C8XAQ4; -.
DR   STRING; 479431.Namu_2969; -.
DR   EnsemblBacteria; ACV79307; ACV79307; Namu_2969.
DR   KEGG; nml:Namu_2969; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OMA; NLGMAMQ; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000002218; 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..57
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397556"
FT   CHAIN           58..288
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397557"
FT   ACT_SITE        58
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   288 AA;  29942 MW;  BFCB39CCF7FE8A0F CRC64;
     MTVDGQVGRW PVSAIPAAYM RPGSGSFTEF LAGAEPHLLP GRAGAQPAGA APAVPHGTTI
     VALTCEQGVV VAGDRRATMG NIIAQRDIEK VFVADSHSAI GIAGTAGLAV EMVRLFRLEL
     EHYEKIEGVR LSLDGKANRL ATMIRGNLGM AMQGLAVVPL FAGVEEDPEV DPVKRGPGGG
     RIFSYDVAGG KYEEHDYYAV GSGSTFARSA LKKRYNAAAD LPGAVRTAVE ALYDAADDDS
     ATGGPDLTRR IFPVVVAITA QGAVRWSDDE VGVVAEAVVA GRMVNPGG