ID   PSB4_ENCCU              Reviewed;         197 AA.
AC   Q8SRF1;
DT   01-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2002, sequence version 1.
DT   27-MAR-2024, entry version 106.
DE   RecName: Full=Probable proteasome subunit beta type-4;
DE   AltName: Full=26S proteasome beta-type subunit PRE1;
DE   AltName: Full=Multicatalytic endopeptidase complex subunit PRE1;
GN   Name=PRE1; OrderedLocusNames=ECU08_0280;
OS   Encephalitozoon cuniculi (strain GB-M1) (Microsporidian parasite).
OC   Eukaryota; Fungi; Fungi incertae sedis; Microsporidia; Unikaryonidae;
OC   Encephalitozoon.
OX   NCBI_TaxID=284813;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=GB-M1;
RX   PubMed=11719806; DOI=10.1038/35106579;
RA   Katinka M.D., Duprat S., Cornillot E., Metenier G., Thomarat F.,
RA   Prensier G., Barbe V., Peyretaillade E., Brottier P., Wincker P.,
RA   Delbac F., El Alaoui H., Peyret P., Saurin W., Gouy M., Weissenbach J.,
RA   Vivares C.P.;
RT   "Genome sequence and gene compaction of the eukaryote parasite
RT   Encephalitozoon cuniculi.";
RL   Nature 414:450-453(2001).
RN   [2]
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS], AND
RP   DEVELOPMENTAL STAGE.
RX   PubMed=16691553; DOI=10.1002/pmic.200500796;
RA   Brosson D., Kuhn L., Delbac F., Garin J., Vivares C.P., Texier C.;
RT   "Proteomic analysis of the eukaryotic parasite Encephalitozoon cuniculi
RT   (microsporidia): a reference map for proteins expressed in late sporogonial
RT   stages.";
RL   Proteomics 6:3625-3635(2006).
CC   -!- FUNCTION: Non-catalytic component of the proteasome which degrades
CC       poly-ubiquitinated proteins in the cytoplasm and in the nucleus. It is
CC       essential for the regulated turnover of proteins and for the removal of
CC       misfolded proteins. The proteasome is a multicatalytic proteinase
CC       complex that is characterized by its ability to cleave peptides with
CC       Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or
CC       slightly basic pH. It has an ATP-dependent proteolytic activity (By
CC       similarity). {ECO:0000250}.
CC   -!- SUBUNIT: The 26S proteasome consists of a 20S proteasome core and two
CC       19S regulatory subunits. The 20S proteasome core is composed of 28
CC       subunits that are arranged in four stacked rings, resulting in a
CC       barrel-shaped structure. The two end rings are each formed by seven
CC       alpha subunits, and the two central rings are each formed by seven beta
CC       subunits. The catalytic chamber with the active sites is on the inside
CC       of the barrel (By similarity). {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|PROSITE-ProRule:PRU00809}.
CC       Nucleus {ECO:0000250}.
CC   -!- DEVELOPMENTAL STAGE: Expressed in late sporogonial stages.
CC       {ECO:0000269|PubMed:16691553}.
CC   -!- SIMILARITY: Belongs to the peptidase T1B family. {ECO:0000255|PROSITE-
CC       ProRule:PRU00809}.
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DR   EMBL; AL590448; CAD26333.1; -; Genomic_DNA.
DR   RefSeq; NP_597157.1; NM_001041766.1.
DR   AlphaFoldDB; Q8SRF1; -.
DR   SMR; Q8SRF1; -.
DR   STRING; 284813.Q8SRF1; -.
DR   GeneID; 859579; -.
DR   KEGG; ecu:ECU08_0280; -.
DR   VEuPathDB; MicrosporidiaDB:ECU08_0280; -.
DR   HOGENOM; CLU_035750_12_1_1; -.
DR   InParanoid; Q8SRF1; -.
DR   OMA; RGPTVLK; -.
DR   OrthoDB; 158209at2759; -.
DR   Proteomes; UP000000819; Chromosome VIII.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0019774; C:proteasome core complex, beta-subunit complex; ISS:UniProtKB.
DR   GO; GO:0043161; P:proteasome-mediated ubiquitin-dependent protein catabolic process; IEA:UniProt.
DR   CDD; cd03758; proteasome_beta_type_2; 1.
DR   Gene3D; 3.60.20.10; Glutamine Phosphoribosylpyrophosphate, subunit 1, domain 1; 1.
DR   InterPro; IPR029055; Ntn_hydrolases_N.
DR   InterPro; IPR035206; Proteasome_beta2.
DR   InterPro; IPR016050; Proteasome_bsu_CS.
DR   InterPro; IPR001353; Proteasome_sua/b.
DR   InterPro; IPR023333; Proteasome_suB-type.
DR   PANTHER; PTHR32194; METALLOPROTEASE TLDD; 1.
DR   PANTHER; PTHR32194:SF2; PROTEASOME SUBUNIT BETA TYPE-1; 1.
DR   Pfam; PF00227; Proteasome; 1.
DR   SUPFAM; SSF56235; N-terminal nucleophile aminohydrolases (Ntn hydrolases); 1.
DR   PROSITE; PS00854; PROTEASOME_BETA_1; 1.
DR   PROSITE; PS51476; PROTEASOME_BETA_2; 1.
PE   1: Evidence at protein level;
KW   Cytoplasm; Nucleus; Proteasome; Reference proteome.
FT   CHAIN           1..197
FT                   /note="Probable proteasome subunit beta type-4"
FT                   /id="PRO_0000382758"
SQ   SEQUENCE   197 AA;  21960 MW;  77D069142A654A2C CRC64;
     MDSSIGIKGR NFAIVAADTK ISSSILVVKE NHEKFQVIKD RIVMAMTGNQ GDAFRTMLYV
     SESALYEEIQ NGIELSPSVL AHMIQNKVHE SLRRRQLDIS SIVAGRGPEK YDLWSVDKYG
     AISSVPFCAS GYAAYFVYGI LDREYSEDIT IDAALSIMQK CVNLLKERLM INLEGFMVKI
     VTDDGILTRT LVPEIKG
//