ID   PSB1_THECD              Reviewed;         284 AA.
AC   D1A2S9;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   19-JAN-2010, sequence version 1.
DT   25-MAY-2022, entry version 60.
DE   RecName: Full=Proteasome subunit beta 1 {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 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   AltName: Full=Proteasome core protein PrcB 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=prcB1 {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=Tcur_2311;
OS   Thermomonospora curvata (strain ATCC 19995 / DSM 43183 / JCM 3096 / KCTC
OS   9072 / NBRC 15933 / NCIMB 10081 / Henssen B9).
OC   Bacteria; Actinobacteria; Streptosporangiales; Thermomonosporaceae;
OC   Thermomonospora.
OX   NCBI_TaxID=471852;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 19995 / DSM 43183 / JCM 3096 / KCTC 9072 / NBRC 15933 / NCIMB
RC   10081 / Henssen B9;
RX   PubMed=21475583; DOI=10.4056/sigs.1453580;
RA   Chertkov O., Sikorski J., Nolan M., Lapidus A., Lucas S., Del Rio T.G.,
RA   Tice H., Cheng J.F., Goodwin L., Pitluck S., Liolios K., Ivanova N.,
RA   Mavromatis K., Mikhailova N., Ovchinnikova G., Pati A., Chen A.,
RA   Palaniappan K., Djao O.D., Land M., Hauser L., Chang Y.J., Jeffries C.D.,
RA   Brettin T., Han C., Detter J.C., Rohde M., Goeker M., Woyke T., Bristow J.,
RA   Eisen J.A., Markowitz V., Hugenholtz P., Klenk H.P., Kyrpides N.C.;
RT   "Complete genome sequence of Thermomonospora curvata type strain (B9).";
RL   Stand. Genomic Sci. 1:13-22(2011).
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; CP001738; ACY97877.1; -; Genomic_DNA.
DR   AlphaFoldDB; D1A2S9; -.
DR   SMR; D1A2S9; -.
DR   STRING; 471852.Tcur_2311; -.
DR   MEROPS; T01.005; -.
DR   PRIDE; D1A2S9; -.
DR   EnsemblBacteria; ACY97877; ACY97877; Tcur_2311.
DR   KEGG; tcu:Tcur_2311; -.
DR   eggNOG; COG0638; Bacteria.
DR   HOGENOM; CLU_035750_2_0_11; -.
DR   OMA; NLGMAMQ; -.
DR   UniPathway; UPA00997; -.
DR   Proteomes; UP000001918; 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..56
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397596"
FT   CHAIN           57..284
FT                   /note="Proteasome subunit beta 1"
FT                   /id="PRO_0000397597"
FT   ACT_SITE        57
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   284 AA;  30317 MW;  8F0B5BD4B7311B59 CRC64;
     MASHDSYTGR LPGAFMNPGT SSFTEFLASY NPDLLPGRHM TALAGGMPGN VEAPHATTIV
     AVTFPGGVVM AGDRRATAGN MIAQRDVEKV FRADEFSAVA IAGTAGIGME IVRLFQVEIE
     HYEKMEGRTL SLEGKANRLA TMIRANLGMA MQGLVAVPLF AGYDTEREVG RIFSYDPAGG
     RYEEHEHHSI GSGSVFARGA LKKLWRPDLS AQDAALVCVQ ALYDAADDDS ATGGPDLIRK
     IYPVVATVTA DGFRRLPEEE VGELARIVVD GRHDSPGGPT APLR