ID   PSB_ACTMD               Reviewed;         282 AA.
AC   C6WID8;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   22-SEP-2009, sequence version 1.
DT   27-MAR-2024, entry version 71.
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=Amir_2241;
OS   Actinosynnema mirum (strain ATCC 29888 / DSM 43827 / JCM 3225 / NBRC 14064
OS   / NCIMB 13271 / NRRL B-12336 / IMRU 3971 / 101).
OC   Bacteria; Actinomycetota; Actinomycetes; Pseudonocardiales;
OC   Pseudonocardiaceae; Actinosynnema.
OX   NCBI_TaxID=446462;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 29888 / DSM 43827 / JCM 3225 / NBRC 14064 / NCIMB 13271 /
RC   NRRL B-12336 / IMRU 3971 / 101;
RX   PubMed=21304636; DOI=10.4056/sigs.21137;
RA   Land M., Lapidus A., Mayilraj S., Chen F., Copeland A., Del Rio T.G.,
RA   Nolan M., Lucas S., Tice H., Cheng J.F., Chertkov O., Bruce D., Goodwin L.,
RA   Pitluck S., Rohde M., Goker M., Pati A., Ivanova N., Mavromatis K.,
RA   Chen A., Palaniappan K., Hauser L., Chang Y.J., Jeffries C.C., Brettin T.,
RA   Detter J.C., Han C., Chain P., Tindall B.J., Bristow J., Eisen J.A.,
RA   Markowitz V., Hugenholtz P., Kyrpides N.C., Klenk H.P.;
RT   "Complete genome sequence of Actinosynnema mirum type strain (101).";
RL   Stand. Genomic Sci. 1:46-53(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; CP001630; ACU36181.1; -; Genomic_DNA.
DR   RefSeq; WP_015801070.1; NC_013093.1.
DR   AlphaFoldDB; C6WID8; -.
DR   SMR; C6WID8; -.
DR   STRING; 446462.Amir_2241; -.
DR   KEGG; ami:Amir_2241; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OrthoDB; 5174038at2; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000002213; 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   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   Reference proteome; Threonine protease; Zymogen.
FT   PROPEP          1..55
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397492"
FT   CHAIN           56..282
FT                   /note="Proteasome subunit beta"
FT                   /id="PRO_0000397493"
FT   ACT_SITE        56
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   282 AA;  29490 MW;  F0664FC22C3F51D4 CRC64;
     MDNSSTGRYP AASLPPAYLR PGSSSFTDFL RAQAPELLPT ARSFPEGSVV QAAHGTTIVA
     LTFKGGVVIA GDRRATMGNV IAQRDMKKVF VTDDYSAVGI AGTAGIAIEI VRLFAVELRH
     YEKIEGVSLS LDGKANRLSG MVKGNLDAAL AGLAVVPLFV GYDTDAADPD RAGRIVSYDV
     TGARFEETLG YQSVGSGSLF AKSALKKLYD PDADAEGAVR AAVEALYDAA DDDSATGGPD
     LVRRIFPVVV TVTAEGAVHL PEERTSAIAE TVVEGRRARP AG
//