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DD21A_XENLA
ID   DD21A_XENLA             Reviewed;         759 AA.
AC   Q9DF35; Q6GP16;
DT   04-MAR-2015, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2002, sequence version 2.
DT   03-AUG-2022, entry version 104.
DE   RecName: Full=Nucleolar RNA helicase 2-A {ECO:0000305};
DE            EC=3.6.4.13 {ECO:0000250|UniProtKB:Q9NR30};
DE   AltName: Full=DEAD box protein 21-A;
DE   AltName: Full=Gu-alpha-A;
DE   AltName: Full=Nucleolar RNA helicase Gu-A {ECO:0000303|PubMed:12851405};
DE            Short=xGu-1 {ECO:0000303|PubMed:12851405};
DE   AltName: Full=Nucleolar RNA helicase II-A {ECO:0000303|PubMed:12851405};
DE   AltName: Full=RH II/Gu-A {ECO:0000303|PubMed:12851405};
GN   Name=ddx21-a;
OS   Xenopus laevis (African clawed frog).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Amphibia;
OC   Batrachia; Anura; Pipoidea; Pipidae; Xenopodinae; Xenopus; Xenopus.
OX   NCBI_TaxID=8355;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA], FUNCTION, SUBCELLULAR LOCATION, AND TISSUE
RP   SPECIFICITY.
RC   TISSUE=Liver {ECO:0000312|EMBL:AAG22819.2};
RX   PubMed=12851405; DOI=10.1074/jbc.m302258200;
RA   Yang H., Zhou J., Ochs R.L., Henning D., Jin R., Valdez B.C.;
RT   "Down-regulation of RNA helicase II/Gu results in the depletion of 18 and
RT   28 S rRNAs in Xenopus oocyte.";
RL   J. Biol. Chem. 278:38847-38859(2003).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] OF 31-759.
RC   TISSUE=Spleen {ECO:0000312|EMBL:AAH73332.1};
RG   NIH - Xenopus Gene Collection (XGC) project;
RL   Submitted (JUN-2004) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: RNA helicase that acts as a sensor of the transcriptional
CC       status of both RNA polymerase (Pol) I and II: promotes ribosomal RNA
CC       (rRNA) processing and transcription from polymerase II (Pol II) (By
CC       similarity). Binds various RNAs, such as rRNAs, snoRNAs, 7SK and, at
CC       lower extent, mRNAs (By similarity). In the nucleolus, localizes to
CC       rDNA locus, where it directly binds rRNAs and snoRNAs, and promotes
CC       rRNA transcription, processing and modification (PubMed:12851405)
CC       (Probable). Required for rRNA 2'-O-methylation, possibly by promoting
CC       the recruitment of late-acting snoRNAs SNORD56 and SNORD58 with pre-
CC       ribosomal complexes (By similarity). In the nucleoplasm, binds 7SK RNA
CC       and is recruited to the promoters of Pol II-transcribed genes: acts by
CC       facilitating the release of P-TEFb from inhibitory 7SK snRNP in a
CC       manner that is dependent on its helicase activity, thereby promoting
CC       transcription of its target genes (By similarity). Required to prevent
CC       R-loop-associated DNA damage and transcription-associated genomic
CC       instability (By similarity). {ECO:0000250|UniProtKB:Q9NR30,
CC       ECO:0000305|PubMed:12851405}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + H2O = ADP + H(+) + phosphate; Xref=Rhea:RHEA:13065,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:43474, ChEBI:CHEBI:456216; EC=3.6.4.13;
CC         Evidence={ECO:0000250|UniProtKB:Q9NR30};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:13066;
CC         Evidence={ECO:0000250|UniProtKB:Q9NR30};
CC   -!- SUBCELLULAR LOCATION: Nucleus, nucleolus {ECO:0000269|PubMed:12851405}.
CC       Nucleus, nucleoplasm {ECO:0000250|UniProtKB:Q9NR30}. Cytoplasm, cytosol
CC       {ECO:0000250|UniProtKB:Q9JIK5}. Mitochondrion
CC       {ECO:0000250|UniProtKB:Q9JIK5}.
CC   -!- TISSUE SPECIFICITY: Widely expressed. Expressed at higher level in
CC       stomach. Expressed at higher level compared to ddx21-b.
CC       {ECO:0000269|PubMed:12851405}.
CC   -!- SIMILARITY: Belongs to the DEAD box helicase family. DDX21/DDX50
CC       subfamily. {ECO:0000305}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAH73332.1; Type=Erroneous initiation; Note=Truncated N-terminus.; Evidence={ECO:0000305};
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DR   EMBL; AF302423; AAG22819.2; -; mRNA.
DR   EMBL; BC073332; AAH73332.1; ALT_INIT; mRNA.
DR   RefSeq; NP_001082035.1; NM_001088566.1.
DR   AlphaFoldDB; Q9DF35; -.
DR   SMR; Q9DF35; -.
DR   REBASE; 204842; Ppe194ORF77P.
DR   DNASU; 398189; -.
DR   GeneID; 398189; -.
DR   KEGG; xla:398189; -.
DR   CTD; 398189; -.
DR   Xenbase; XB-GENE-17331446; ddx21.S.
DR   OrthoDB; 1139373at2759; -.
DR   Proteomes; UP000186698; Chromosome 7S.
DR   Bgee; 398189; Expressed in lung and 19 other tissues.
DR   GO; GO:0005829; C:cytosol; ISS:UniProtKB.
DR   GO; GO:0005739; C:mitochondrion; IEA:UniProtKB-SubCell.
DR   GO; GO:0005730; C:nucleolus; IDA:UniProtKB.
DR   GO; GO:0005654; C:nucleoplasm; ISS:UniProtKB.
DR   GO; GO:0097322; F:7SK snRNA binding; ISS:UniProtKB.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR   GO; GO:0016887; F:ATP hydrolysis activity; IEA:RHEA.
DR   GO; GO:0003724; F:RNA helicase activity; ISS:UniProtKB.
DR   GO; GO:0019843; F:rRNA binding; ISS:UniProtKB.
DR   GO; GO:0030515; F:snoRNA binding; ISS:UniProtKB.
DR   GO; GO:0062176; P:R-loop disassembly; ISS:UniProtKB.
DR   GO; GO:0006364; P:rRNA processing; IMP:UniProtKB.
DR   GO; GO:0006366; P:transcription by RNA polymerase II; ISS:UniProtKB.
DR   Gene3D; 3.40.50.300; -; 2.
DR   InterPro; IPR011545; DEAD/DEAH_box_helicase_dom.
DR   InterPro; IPR012562; GUCT.
DR   InterPro; IPR014001; Helicase_ATP-bd.
DR   InterPro; IPR001650; Helicase_C.
DR   InterPro; IPR027417; P-loop_NTPase.
DR   InterPro; IPR035979; RBD_domain_sf.
DR   Pfam; PF00270; DEAD; 1.
DR   Pfam; PF08152; GUCT; 1.
DR   Pfam; PF00271; Helicase_C; 1.
DR   SMART; SM00487; DEXDc; 1.
DR   SMART; SM00490; HELICc; 1.
DR   SUPFAM; SSF52540; SSF52540; 1.
DR   SUPFAM; SSF54928; SSF54928; 1.
DR   PROSITE; PS51192; HELICASE_ATP_BIND_1; 1.
DR   PROSITE; PS51194; HELICASE_CTER; 1.
DR   PROSITE; PS51195; Q_MOTIF; 1.
PE   2: Evidence at transcript level;
KW   ATP-binding; Cytoplasm; Helicase; Hydrolase; Mitochondrion;
KW   Nucleotide-binding; Nucleus; Reference proteome; Repeat; RNA-binding;
KW   rRNA processing; Transcription.
FT   CHAIN           1..759
FT                   /note="Nucleolar RNA helicase 2-A"
FT                   /id="PRO_0000432388"
FT   DOMAIN          210..389
FT                   /note="Helicase ATP-binding"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
FT   DOMAIN          422..566
FT                   /note="Helicase C-terminal"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00542"
FT   REGION          1..154
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          709..759
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   MOTIF           179..207
FT                   /note="Q motif"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00552"
FT   MOTIF           332..335
FT                   /note="DEAD box"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
FT   COMPBIAS        9..47
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        116..130
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        131..154
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        714..736
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   BINDING         223..230
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
FT   CONFLICT        50
FT                   /note="V -> I (in Ref. 2; AAH73332)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        73
FT                   /note="S -> T (in Ref. 2; AAH73332)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        128
FT                   /note="V -> I (in Ref. 2; AAH73332)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        171
FT                   /note="D -> E (in Ref. 2; AAH73332)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        631
FT                   /note="D -> V (in Ref. 2; AAH73332)"
FT                   /evidence="ECO:0000305"
SQ   SEQUENCE   759 AA;  84940 MW;  F9278DC433C6785F CRC64;
     MPVKVYAEEM EGESMKKKKL SETPLPKIKK RKMKNGDTED LDLEHMAESV NGEINNNNPT
     PKLKKKKKPA PISDLSETAE ECDGEQPDPS TPTPKKVKKK KIKESKEDSD TQEEAEQSEP
     QTNGVKSVKK SKKNITSDDN EPAPKKRKTD TTEITTAKEC EEKVLTKEEQ DINQEKIDGD
     FSKFPLSKET IKNLQAKGVS YLFPIQSKTF HTAYSGKDVV VQARTGTGKT FSFAIPLVEK
     LNEDQQPLAR GRAPRVIILT PTRELAIQIT NEIRSITKKL KVSCFYGGTP YQQQVFAIKD
     GIDFLVGTPG RVRDLVQNYR LDLTTLKHVV LDEVDMMFDM GFSEQVEEIL SVRYKADPEE
     NPQTLLFSAT CPDWMYNMAK KYMRKQFEKI DLIGHRSQKA ATTVEHLAIE CTRSQKAAVL
     GDLVQVYSGS HGKTIIFCDS KLEAHTLATS CGSLKQSAKS LHGDLQQKER EVVLKGFRQG
     TFEVLIATNV AARGLDIPEV DLVVLYSAPK EADAYVHRSG RTGRAGRTGV CISLYEPWER
     HYLRNVERST GITFKRVGVP SLLNVAKSSS ADAIKSLDTV PADVIEHFKE YAQELIEQKG
     ALTAIAAALA HISGATSIKQ RSLLNMEAGC DTITLKSSVP IHSLSYAWQS IKEQLGDDVD
     SKIHRMCLLK DSMGVCFDVR SENLESMQER WTDTKQWQFT VATELPAIQE SERNFDGPRN
     RGFGGRGRRP FDRRNNSRNS NRGGGGRGRN RNGGFRRGR
 
 
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