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BLH1_YEAS8
ID   BLH1_YEAS8              Reviewed;         483 AA.
AC   C8ZFZ7;
DT   23-MAR-2010, integrated into UniProtKB/Swiss-Prot.
DT   23-MAR-2010, sequence version 2.
DT   03-AUG-2022, entry version 46.
DE   RecName: Full=Cysteine proteinase 1, mitochondrial;
DE            EC=3.4.22.40;
DE   AltName: Full=Bleomycin hydrolase;
DE            Short=BLM hydrolase;
DE   AltName: Full=Homocysteine-thiolactonase;
DE            Short=HTLase;
DE            Short=Hcy-thiolactonase;
DE   AltName: Full=Leucine aminopeptidase 3;
DE   AltName: Full=Y3;
DE   Flags: Precursor;
GN   Name=LAP3; Synonyms=BLH1, GAL6, YCP1; ORFNames=EC1118_1N9_1035g;
OS   Saccharomyces cerevisiae (strain Lalvin EC1118 / Prise de mousse) (Baker's
OS   yeast).
OC   Eukaryota; Fungi; Dikarya; Ascomycota; Saccharomycotina; Saccharomycetes;
OC   Saccharomycetales; Saccharomycetaceae; Saccharomyces.
OX   NCBI_TaxID=643680;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Lalvin EC1118 / Prise de mousse;
RX   PubMed=19805302; DOI=10.1073/pnas.0904673106;
RA   Novo M., Bigey F., Beyne E., Galeote V., Gavory F., Mallet S., Cambon B.,
RA   Legras J.-L., Wincker P., Casaregola S., Dequin S.;
RT   "Eukaryote-to-eukaryote gene transfer events revealed by the genome
RT   sequence of the wine yeast Saccharomyces cerevisiae EC1118.";
RL   Proc. Natl. Acad. Sci. U.S.A. 106:16333-16338(2009).
CC   -!- FUNCTION: The normal physiological role of the enzyme is unknown, but
CC       it is not essential for the viability of yeast cells. Has
CC       aminopeptidase activity, shortening substrate peptides sequentially by
CC       1 amino acid. Has bleomycin hydrolase activity, which can protect the
CC       cell from the toxic effects of bleomycin. Has homocysteine-
CC       thiolactonase activity, protecting the cell against homocysteine
CC       toxicity. Acts as a repressor in the GAL4 regulatory system, but this
CC       does not require either the peptidase or nucleic acid-binding
CC       activities (By similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=Inactivates bleomycin B2 (a cytotoxic glycometallopeptide) by
CC         hydrolysis of a carboxyamide bond of beta-aminoalanine, but also
CC         shows general aminopeptidase activity. The specificity varies
CC         somewhat with source, but amino acid arylamides of Met, Leu and Ala
CC         are preferred.; EC=3.4.22.40;
CC   -!- ACTIVITY REGULATION: Inhibited by E64, a specific inhibitor of cysteine
CC       proteases, N-ethylmaleimide, iodacetamide, and mercury and zinc ions.
CC       {ECO:0000250}.
CC   -!- SUBUNIT: Homohexamer. Binds to nucleic acids. Binds single-stranded DNA
CC       and RNA with higher affinity than double-stranded DNA (By similarity).
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion {ECO:0000250}. Cytoplasm
CC       {ECO:0000250}.
CC   -!- ALTERNATIVE PRODUCTS:
CC       Event=Alternative initiation; Named isoforms=2;
CC       Name=Mitochondrial;
CC         IsoId=C8ZFZ7-1; Sequence=Displayed;
CC       Name=Cytoplasmic;
CC         IsoId=C8ZFZ7-2; Sequence=VSP_038915;
CC   -!- PTM: The N-terminus of isoform Cytoplasmic is blocked. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the peptidase C1 family. {ECO:0000255|PROSITE-
CC       ProRule:PRU10088, ECO:0000255|PROSITE-ProRule:PRU10089}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=CAY82370.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; FN393086; CAY82370.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; C8ZFZ7; -.
DR   SMR; C8ZFZ7; -.
DR   MEROPS; C01.085; -.
DR   EnsemblFungi; CAY82370; CAY82370; EC1118_1N9_1035g. [C8ZFZ7-2]
DR   HOGENOM; CLU_038600_0_1_1; -.
DR   Proteomes; UP000000286; Chromosome XIV, Scaffold EC1118_1N9.
DR   GO; GO:0005739; C:mitochondrion; IEA:UniProtKB-SubCell.
DR   GO; GO:0004197; F:cysteine-type endopeptidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0006508; P:proteolysis; IEA:UniProtKB-KW.
DR   CDD; cd00585; Peptidase_C1B; 1.
DR   InterPro; IPR038765; Papain-like_cys_pep_sf.
DR   InterPro; IPR000169; Pept_cys_AS.
DR   InterPro; IPR025660; Pept_his_AS.
DR   InterPro; IPR004134; Peptidase_C1B.
DR   PANTHER; PTHR10363; PTHR10363; 1.
DR   Pfam; PF03051; Peptidase_C1_2; 1.
DR   PIRSF; PIRSF005700; PepC; 1.
DR   SUPFAM; SSF54001; SSF54001; 1.
DR   PROSITE; PS00139; THIOL_PROTEASE_CYS; 1.
DR   PROSITE; PS00639; THIOL_PROTEASE_HIS; 1.
PE   3: Inferred from homology;
KW   Alternative initiation; Cytoplasm; DNA-binding; Hydrolase; Mitochondrion;
KW   Protease; Thiol protease; Transit peptide.
FT   TRANSIT         1..30
FT                   /note="Mitochondrion"
FT                   /evidence="ECO:0000255"
FT   CHAIN           31..482
FT                   /note="Cysteine proteinase 1, mitochondrial"
FT                   /id="PRO_0000393308"
FT   PROPEP          483
FT                   /note="Removed in mature form; by autocatalysis"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000393309"
FT   ACT_SITE        102
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        398
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        421
FT                   /evidence="ECO:0000250"
FT   VAR_SEQ         1..29
FT                   /note="Missing (in isoform Cytoplasmic)"
FT                   /evidence="ECO:0000305"
FT                   /id="VSP_038915"
SQ   SEQUENCE   483 AA;  55483 MW;  BF92A6049F98DD3D CRC64;
     MLPTSVSRSL YLKTFRSHLL RAPQIVLKRM SSSIDISKIN SWNKEFQSDL THQLATTVLK
     NYNADDALLN KTRLQKQDNR VFNTVVSTDS TPVTNQKSSG RCWLFAATNQ LRLNVLSELN
     LKEFELSQAY LFFYDKLEKA NYFLDQIVSS ADQDIDSRLV QYLLAAPTED GGQYSMFLNL
     VKKYGLIPKD LYGDLPYSTT ASRKWNSLLT TKLREFAETL RTALKERSAD DSIIVTLREQ
     MQREIFRLMS LFMDIPPVQP NEQFTWEYVD KDKKIHTIKS TPLEFASKYA KLDPSTPVSL
     INDPRHPYGK LIKIDRLGNV LGGDAVIYLN VDNETLSKLV VKRLQNNKAV FFGSHTPKFM
     DKKTGVMDIE LWNYPAIGYN LPQQKASRIR YHESLMTHAM LITGCHVDET SKLPLRYRVE
     NSWGKDSGKD GLYVMTQKYF EEYCFQIVVD INELPKELAS KFTSGKEEPI VLPIWDPMGA
     LAK
 
 
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