ID   PSB2_STAMF              Reviewed;         208 AA.
AC   A3DN27;
DT   10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT   20-MAR-2007, sequence version 1.
DT   25-MAY-2022, entry version 82.
DE   RecName: Full=Proteasome subunit beta 2 {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 2 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   AltName: Full=Proteasome core protein PsmB 2 {ECO:0000255|HAMAP-Rule:MF_02113};
DE   Flags: Precursor;
GN   Name=psmB2 {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=Smar_0938;
OS   Staphylothermus marinus (strain ATCC 43588 / DSM 3639 / JCM 9404 / F1).
OC   Archaea; Crenarchaeota; Thermoprotei; Desulfurococcales;
OC   Desulfurococcaceae; Staphylothermus.
OX   NCBI_TaxID=399550;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 43588 / DSM 3639 / JCM 9404 / F1;
RX   PubMed=19341479; DOI=10.1186/1471-2164-10-145;
RA   Anderson I.J., Dharmarajan L., Rodriguez J., Hooper S., Porat I.,
RA   Ulrich L.E., Elkins J.G., Mavromatis K., Sun H., Land M., Lapidus A.,
RA   Lucas S., Barry K., Huber H., Zhulin I.B., Whitman W.B., Mukhopadhyay B.,
RA   Woese C., Bristow J., Kyrpides N.;
RT   "The complete genome sequence of Staphylothermus marinus reveals
RT   differences in sulfur metabolism among heterotrophic Crenarchaeota.";
RL   BMC Genomics 10:145-145(2009).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 43588 / DSM 3639 / JCM 9404 / F1;
RX   PubMed=21304655; DOI=10.4056/sigs.30527;
RA   Anderson I.J., Sun H., Lapidus A., Copeland A., Glavina Del Rio T.,
RA   Tice H., Dalin E., Lucas S., Barry K., Land M., Richardson P., Huber H.,
RA   Kyrpides N.C.;
RT   "Complete genome sequence of Staphylothermus marinus Stetter and Fiala 1986
RT   type strain F1.";
RL   Stand. Genomic Sci. 1:183-188(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 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; CP000575; ABN70037.1; -; Genomic_DNA.
DR   AlphaFoldDB; A3DN27; -.
DR   SMR; A3DN27; -.
DR   STRING; 399550.Smar_0938; -.
DR   MEROPS; T01.002; -.
DR   EnsemblBacteria; ABN70037; ABN70037; Smar_0938.
DR   KEGG; smr:Smar_0938; -.
DR   eggNOG; arCOG00970; Archaea.
DR   HOGENOM; CLU_035750_7_2_2; -.
DR   OMA; VDKTGPH; -.
DR   Proteomes; UP000000254; 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; IPR016050; Proteasome_bsu_CS.
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; PS00854; PROTEASOME_BETA_1; 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..9
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT                   /id="PRO_0000397420"
FT   CHAIN           10..208
FT                   /note="Proteasome subunit beta 2"
FT                   /id="PRO_0000397421"
FT   ACT_SITE        10
FT                   /note="Nucleophile"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ   SEQUENCE   208 AA;  22601 MW;  86B7CEE1347A0AB4 CRC64;
     MSGKKIVSKT TTVGIVVGDY VVLAADKRAT AGSLVAHKRV KKIIRIDDYI AMTISGLVAD
     AEIIAEQARF IARKYKLELG RPIKVSALAS NLSIILNAYL RMSPYIVQLL LGGYDDNGPH
     LFYIDLFGSL SEEKYMATGS GSPTAFGVLE EEYRSDLSLD EAKELAFKAV SAATKRDGFS
     GEGVDIVVIG PNTYVEETKL FKRSIIAK