ID DDX20_DICDI Reviewed; 849 AA.
AC Q54ZI9; Q8MYE9;
DT 08-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT 08-APR-2008, sequence version 2.
DT 24-JAN-2024, entry version 108.
DE RecName: Full=Probable ATP-dependent RNA helicase ddx20;
DE EC=3.6.4.13;
DE AltName: Full=DEAD box protein 20;
GN Name=ddx20; ORFNames=DDB_G0277527;
OS Dictyostelium discoideum (Social amoeba).
OC Eukaryota; Amoebozoa; Evosea; Eumycetozoa; Dictyostelia; Dictyosteliales;
OC Dictyosteliaceae; Dictyostelium.
OX NCBI_TaxID=44689;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=AX4;
RX PubMed=12097910; DOI=10.1038/nature00847;
RA Gloeckner G., Eichinger L., Szafranski K., Pachebat J.A., Bankier A.T.,
RA Dear P.H., Lehmann R., Baumgart C., Parra G., Abril J.F., Guigo R.,
RA Kumpf K., Tunggal B., Cox E.C., Quail M.A., Platzer M., Rosenthal A.,
RA Noegel A.A.;
RT "Sequence and analysis of chromosome 2 of Dictyostelium discoideum.";
RL Nature 418:79-85(2002).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=AX4;
RX PubMed=15875012; DOI=10.1038/nature03481;
RA Eichinger L., Pachebat J.A., Gloeckner G., Rajandream M.A., Sucgang R.,
RA Berriman M., Song J., Olsen R., Szafranski K., Xu Q., Tunggal B.,
RA Kummerfeld S., Madera M., Konfortov B.A., Rivero F., Bankier A.T.,
RA Lehmann R., Hamlin N., Davies R., Gaudet P., Fey P., Pilcher K., Chen G.,
RA Saunders D., Sodergren E.J., Davis P., Kerhornou A., Nie X., Hall N.,
RA Anjard C., Hemphill L., Bason N., Farbrother P., Desany B., Just E.,
RA Morio T., Rost R., Churcher C.M., Cooper J., Haydock S., van Driessche N.,
RA Cronin A., Goodhead I., Muzny D.M., Mourier T., Pain A., Lu M., Harper D.,
RA Lindsay R., Hauser H., James K.D., Quiles M., Madan Babu M., Saito T.,
RA Buchrieser C., Wardroper A., Felder M., Thangavelu M., Johnson D.,
RA Knights A., Loulseged H., Mungall K.L., Oliver K., Price C., Quail M.A.,
RA Urushihara H., Hernandez J., Rabbinowitsch E., Steffen D., Sanders M.,
RA Ma J., Kohara Y., Sharp S., Simmonds M.N., Spiegler S., Tivey A.,
RA Sugano S., White B., Walker D., Woodward J.R., Winckler T., Tanaka Y.,
RA Shaulsky G., Schleicher M., Weinstock G.M., Rosenthal A., Cox E.C.,
RA Chisholm R.L., Gibbs R.A., Loomis W.F., Platzer M., Kay R.R.,
RA Williams J.G., Dear P.H., Noegel A.A., Barrell B.G., Kuspa A.;
RT "The genome of the social amoeba Dictyostelium discoideum.";
RL Nature 435:43-57(2005).
CC -!- FUNCTION: The SMN complex catalyzes the assembly of small nuclear
CC ribonucleoproteins (snRNPs), the building blocks of the spliceosome,
CC and thereby plays an important role in the splicing of cellular pre-
CC mRNAs. Most spliceosomal snRNPs contain a common set of Sm proteins
CC SNRPB, SNRPD1, SNRPD2, SNRPD3, SNRPE, SNRPF and SNRPG that assemble in
CC a heptameric protein ring on the Sm site of the small nuclear RNA to
CC form the core snRNP (Sm core). In the cytosol, the Sm proteins SNRPD1,
CC SNRPD2, SNRPE, SNRPF and SNRPG are trapped in an inactive 6S pICln-Sm
CC complex by the chaperone CLNS1A that controls the assembly of the core
CC snRNP. To assemble core snRNPs, the SMN complex accepts the trapped 5Sm
CC proteins from CLNS1A forming an intermediate. Binding of snRNA inside
CC 5Sm triggers eviction of the SMN complex, thereby allowing binding of
CC SNRPD3 and SNRPB to complete assembly of the core snRNP. May also play
CC a role in the metabolism of small nucleolar ribonucleoprotein (snoRNPs)
CC (By similarity). {ECO:0000250|UniProtKB:Q9UHI6}.
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 -!- SUBUNIT: Part of the core SMN complex. {ECO:0000250|UniProtKB:Q9UHI6}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250|UniProtKB:Q9UHI6}. Nucleus
CC {ECO:0000250|UniProtKB:Q9UHI6}.
CC -!- DOMAIN: The Q motif is unique to and characteristic of the DEAD box
CC family of RNA helicases and controls ATP binding and hydrolysis.
CC -!- SIMILARITY: Belongs to the DEAD box helicase family. DDX20 subfamily.
CC {ECO:0000305}.
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DR EMBL; AAFI02000020; EAL68726.2; -; Genomic_DNA.
DR RefSeq; XP_642653.2; XM_637561.2.
DR AlphaFoldDB; Q54ZI9; -.
DR SMR; Q54ZI9; -.
DR STRING; 44689.Q54ZI9; -.
DR PaxDb; 44689-DDB0266359; -.
DR EnsemblProtists; EAL68726; EAL68726; DDB_G0277527.
DR GeneID; 8621069; -.
DR KEGG; ddi:DDB_G0277527; -.
DR dictyBase; DDB_G0277527; ddx20.
DR eggNOG; KOG4284; Eukaryota.
DR HOGENOM; CLU_336009_0_0_1; -.
DR InParanoid; Q54ZI9; -.
DR OMA; DYHYENQ; -.
DR PhylomeDB; Q54ZI9; -.
DR PRO; PR:Q54ZI9; -.
DR Proteomes; UP000002195; Chromosome 2.
DR GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR GO; GO:0032797; C:SMN complex; IBA:GO_Central.
DR GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR GO; GO:0016887; F:ATP hydrolysis activity; IEA:RHEA.
DR GO; GO:0003723; F:RNA binding; IBA:GO_Central.
DR GO; GO:0003724; F:RNA helicase activity; IBA:GO_Central.
DR GO; GO:0000387; P:spliceosomal snRNP assembly; IBA:GO_Central.
DR CDD; cd18787; SF2_C_DEAD; 1.
DR Gene3D; 3.40.50.300; P-loop containing nucleotide triphosphate hydrolases; 2.
DR InterPro; IPR011545; DEAD/DEAH_box_helicase_dom.
DR InterPro; IPR014001; Helicase_ATP-bd.
DR InterPro; IPR001650; Helicase_C.
DR InterPro; IPR027417; P-loop_NTPase.
DR InterPro; IPR000629; RNA-helicase_DEAD-box_CS.
DR InterPro; IPR014014; RNA_helicase_DEAD_Q_motif.
DR PANTHER; PTHR47958; ATP-DEPENDENT RNA HELICASE DBP3; 1.
DR PANTHER; PTHR47958:SF89; ATP-DEPENDENT RNA HELICASE DDX20-RELATED; 1.
DR Pfam; PF00270; DEAD; 1.
DR Pfam; PF00271; Helicase_C; 1.
DR SMART; SM00487; DEXDc; 1.
DR SMART; SM00490; HELICc; 1.
DR SUPFAM; SSF52540; P-loop containing nucleoside triphosphate hydrolases; 1.
DR PROSITE; PS00039; DEAD_ATP_HELICASE; 1.
DR PROSITE; PS51192; HELICASE_ATP_BIND_1; 1.
DR PROSITE; PS51194; HELICASE_CTER; 1.
DR PROSITE; PS51195; Q_MOTIF; 1.
PE 3: Inferred from homology;
KW ATP-binding; Cytoplasm; Helicase; Hydrolase; mRNA processing;
KW mRNA splicing; Nucleotide-binding; Nucleus; Reference proteome.
FT CHAIN 1..849
FT /note="Probable ATP-dependent RNA helicase ddx20"
FT /id="PRO_0000327408"
FT DOMAIN 86..319
FT /note="Helicase ATP-binding"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
FT DOMAIN 355..499
FT /note="Helicase C-terminal"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00542"
FT REGION 9..39
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 480..504
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 572..644
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 667..737
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT REGION 761..817
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT MOTIF 55..83
FT /note="Q motif"
FT MOTIF 255..258
FT /note="DEAD box"
FT COMPBIAS 579..594
FT /note="Acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 625..644
FT /note="Acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT BINDING 77
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250"
FT BINDING 82
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000250"
FT BINDING 99..106
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
FT BINDING 102..107
FT /ligand="ATP"
FT /ligand_id="ChEBI:CHEBI:30616"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00541"
SQ SEQUENCE 849 AA; 99148 MW; B09D06FE41403C0A CRC64;
MKNKILFSFS NPMNSNSSNN IENNNNSNNN NNNFKNNFKN FSRKRTNDIE IEDNITFSEL
LLQKEVLKGL EDGGYQRPSP IQLKAIPLGI SGVDLIAQAK SGTGKTIVFG VIALECVLRE
SKLLRQKQEL NKTQLTNQTN KQLLEMDDDT YVETMVGIIR KPLVLIIAPT REIAVQIKDV
IKSISKYCKR IKCEVFIGGL NSNNNKDENN NNILNNEDVN RLNGTQIIVG TPGKIKSLIE
NLHLRTDTLK MVIMDEADKL LDASFSKTIN WIYSAIGNGN SNKNNSSSGS GIQMLAFSAT
YPSYLINLLK LYMNNENLVE IRLCSDTPSL EGIKQYYQIF RNDFTENNYK TFQNKCKSLV
LVLEQVSFYQ AIIFCNHKIR GEELTRQLNR EGWPTAFIAG GQNQKDRLST MSALKSFNIR
ILVSTDLISR GIDVERVNLV INLDLPKDHE TYFHRIGRTG RFGTYGVSIT FINMKSIQQQ
QQQQQQQQQQ IENENENENN NNNEGFQEID FINQLIQEYS VDITERVDND IIPEELYSYQ
LSNPNDQQSL ANLKLKQQQT ILLNKQLEEL KINENENENQ YQNEDEEEEQ EEDDYHYENQ
HQNEDEEEEQ EEDDYHYENQ HQNEEEEQEQ QEEDDDNYNY ENDNDSEEYE FIDDSIIEQT
EYYYLNSNNN NNNNKNKYGN TINNNHYRNS SFNGPKNSIN NNKFKNKNIN NNDQRNSQSN
GIKKKVNTNN NNFYPHYYNN PYPQNYYYDY QYFSDNSYYN NNYNNNNNNN NNNNNNNNNN
NNNNNNNNNN NNNNNNNNNN NNNNNNNYYQ QHGNNPYGYN IPNSIQYSSN QFYYCTCPNC
PTMNYHQYI
//
