PSB_METM6
ID PSB_METM6 Reviewed; 219 AA.
AC A9A788;
DT 10-AUG-2010, integrated into UniProtKB/Swiss-Prot.
DT 15-JAN-2008, sequence version 1.
DT 25-MAY-2022, entry version 77.
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 PsmB {ECO:0000255|HAMAP-Rule:MF_02113};
DE Flags: Precursor;
GN Name=psmB {ECO:0000255|HAMAP-Rule:MF_02113}; OrderedLocusNames=MmarC6_0189;
OS Methanococcus maripaludis (strain C6 / ATCC BAA-1332).
OC Archaea; Euryarchaeota; Methanomada group; Methanococci; Methanococcales;
OC Methanococcaceae; Methanococcus.
OX NCBI_TaxID=444158;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=C6 / ATCC BAA-1332;
RG US DOE Joint Genome Institute;
RA Copeland A., Lucas S., Lapidus A., Barry K., Glavina del Rio T., Dalin E.,
RA Tice H., Pitluck S., Clum A., Schmutz J., Larimer F., Land M., Hauser L.,
RA Kyrpides N., Mikhailova N., Sieprawska-Lupa M., Whitman W.B.,
RA Richardson P.;
RT "Complete sequence of Methanococcus maripaludis C6.";
RL Submitted (OCT-2007) 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 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; CP000867; ABX01012.1; -; Genomic_DNA.
DR RefSeq; WP_012068238.1; NC_009975.1.
DR AlphaFoldDB; A9A788; -.
DR SMR; A9A788; -.
DR STRING; 444158.MmarC6_0189; -.
DR MEROPS; T01.002; -.
DR EnsemblBacteria; ABX01012; ABX01012; MmarC6_0189.
DR GeneID; 5737994; -.
DR KEGG; mmx:MmarC6_0189; -.
DR eggNOG; arCOG00970; Archaea.
DR HOGENOM; CLU_035750_7_2_2; -.
DR OMA; VDKTGPH; -.
DR OrthoDB; 89767at2157; -.
DR PhylomeDB; A9A788; -.
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 Threonine protease; Zymogen.
FT PROPEP 1..14
FT /note="Removed in mature form; by autocatalysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
FT /id="PRO_0000397350"
FT CHAIN 15..219
FT /note="Proteasome subunit beta"
FT /id="PRO_0000397351"
FT ACT_SITE 15
FT /note="Nucleophile"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_02113"
SQ SEQUENCE 219 AA; 23678 MW; A67C8A9C8A96FCF2 CRC64;
MISNSEYHKE YMKGTTTVGL LCKDGVVLAT DKRATMGNLI ADKEAKKLYK IDDYIAMTIA
GSVGDAQSLI RLISAEAKIY KMRTGNNMTP LSCTTLISNV LHGNRHYPLL TQLILGGYDL
INGAKLFSLD PVGGINEESS FTATGSGSPT AYGVLEAEYR SDVTIDKGLL VAVKALSSAM
QRDAYSGNGI SLAHINKDGV NIYSDEEIEG FLKKINKKR