ID   PSB1_HALTV              Reviewed;         243 AA.
AC   D2RQX3;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   02-MAR-2010, sequence version 1.
DT   25-MAY-2022, entry version 66.
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 PsmB 1 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=psmB1 {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=Htur_1568;
OS   Haloterrigena turkmenica (strain ATCC 51198 / DSM 5511 / JCM 9101 / NCIMB
OS   13204 / VKM B-1734 / 4k) (Halococcus turkmenicus).
OC   Archaea; Euryarchaeota; Stenosarchaea group; Halobacteria; Natrialbales;
OC   Natrialbaceae; Haloterrigena.
OX   NCBI_TaxID=543526;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51198 / DSM 5511 / JCM 9101 / NCIMB 13204 / VKM B-1734 / 4k;
RX   PubMed=21304683; DOI=10.4056/sigs.681272;
RA   Saunders E., Tindall B.J., Fahnrich R., Lapidus A., Copeland A.,
RA   Del Rio T.G., Lucas S., Chen F., Tice H., Cheng J.F., Han C., Detter J.C.,
RA   Bruce D., Goodwin L., Chain P., Pitluck S., Pati A., Ivanova N.,
RA   Mavromatis K., Chen A., Palaniappan K., Land M., Hauser L., Chang Y.J.,
RA   Jeffries C.D., Brettin T., Rohde M., Goker M., Bristow J., Eisen J.A.,
RA   Markowitz V., Hugenholtz P., Klenk H.P., Kyrpides N.C.;
RT   "Complete genome sequence of Haloterrigena turkmenica type strain (4k).";
RL   Stand. Genomic Sci. 2:107-116(2010).
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 PAN-20S
CC       proteasome complex, via the docking of the C-termini of PAN into the
CC       intersubunit pockets in the alpha-rings, triggers opening of the gate
CC       for substrate entry. Interconversion between the open-gate and close-
CC       gate conformations leads to a dynamic regulation of the 20S proteasome
CC       proteolysis activity. {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 at one or both ends by the proteasome regulatory ATPase, PAN.
CC       {ECO:0000255|HAMAP-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; CP001860; ADB60454.1; -; Genomic_DNA.
DR   RefSeq; WP_012942752.1; NC_013743.1.
DR   AlphaFoldDB; D2RQX3; -.
DR   SMR; D2RQX3; -.
DR   STRING; 543526.Htur_1568; -.
DR   MEROPS; T01.002; -.
DR   EnsemblBacteria; ADB60454; ADB60454; Htur_1568.
DR   GeneID; 8742159; -.
DR   KEGG; htu:Htur_1568; -.
DR   eggNOG; arCOG00970; Archaea.
DR   HOGENOM; CLU_035750_7_2_2; -.
DR   OMA; VDKTGPH; -.
DR   OrthoDB; 89767at2157; -.
DR   Proteomes; UP000001903; 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:0010498; P:proteasomal protein catabolic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.60.20.10; -; 1.
DR   HAMAP; MF_02113_A; Proteasome_B_A; 1.
DR   InterPro; IPR029055; Ntn_hydrolases_N.
DR   InterPro; IPR019983; Pept_T1A_Psome_bsu_arc.
DR   InterPro; IPR000243; Pept_T1A_subB.
DR   InterPro; IPR001353; Proteasome_sua/b.
DR   InterPro; IPR023333; Proteasome_suB-type.
DR   Pfam; PF00227; Proteasome; 1.
DR   PRINTS; PR00141; PROTEASOME.
DR   SUPFAM; SSF56235; SSF56235; 1.
DR   TIGRFAMs; TIGR03634; arc_protsome_B; 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..48
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397310"
FT   CHAIN           49..243
FT                   /note="Proteasome subunit beta 1"
FT                   /id="PRO_0000397311"
FT   REGION          1..34
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1..15
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   ACT_SITE        49
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   243 AA;  25825 MW;  DAA0BA87B20DABA4 CRC64;
     MRAPQHNSDF SRTVDQLADD PNPYEPEIGS MPQNDLTRAD LDNVNKTGTT TIGISTADGV
     VIATDMRASL GGRFVSNKNV QKVEQIHPTG ALTLVGSVGG AQSFISSLRA EVNLYESRRG
     EQMSIDALAT LAGNFARGGP FFAIHPILGG VDEEGSHVYS IDPAGGVMED DYTVTGSGMQ
     LAYGHLEQAY EEDMSNEEAV SVAAHGIKSA VERDTGSGNG VFLCEITDEG VDIHGHHDFD
     EVL