GenomeNet

Database: UniProt
Entry: A0A178VTI3_ARATH
LinkDB: A0A178VTI3_ARATH
Original site: A0A178VTI3_ARATH 
ID   A0A178VTI3_ARATH        Unreviewed;      3575 AA.
AC   A0A178VTI3; A0A1P8B2X1;
DT   07-SEP-2016, integrated into UniProtKB/TrEMBL.
DT   07-SEP-2016, sequence version 1.
DT   27-MAR-2024, entry version 43.
DE   SubName: Full=P-loop containing nucleoside triphosphate hydrolases superfamily protein {ECO:0000313|EMBL:ANM63246.1};
GN   Name=SYD {ECO:0000313|EMBL:ANM63246.1, ECO:0000313|TAIR:AT2G28290};
GN   Synonyms=CHR3 {ECO:0000313|EMBL:ANM63246.1}, SPLAYED
GN   {ECO:0000313|EMBL:ANM63246.1};
GN   OrderedLocusNames=At2g28290 {ECO:0000313|Araport:AT2G28290,
GN   ECO:0000313|EMBL:ANM63246.1};
OS   Arabidopsis thaliana (Mouse-ear cress).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; malvids; Brassicales; Brassicaceae; Camelineae; Arabidopsis.
OX   NCBI_TaxID=3702 {ECO:0000313|EMBL:ANM63246.1, ECO:0000313|Proteomes:UP000006548};
RN   [1] {ECO:0000313|EMBL:ANM63246.1, ECO:0000313|Proteomes:UP000006548}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=cv. Columbia {ECO:0000313|Proteomes:UP000006548};
RX   PubMed=10617197; DOI=10.1038/45471;
RA   Lin X., Kaul S., Rounsley S., Shea T.P., Benito M.I., Town C.D.,
RA   Fujii C.Y., Mason T., Bowman C.L., Barnstead M., Feldblyum T.V.,
RA   Buell C.R., Ketchum K.A., Lee J., Ronning C.M., Koo H.L., Moffat K.S.,
RA   Cronin L.A., Shen M., Pai G., Van Aken S., Umayam L., Tallon L.J.,
RA   Gill J.E., Adams M.D., Carrera A.J., Creasy T.H., Goodman H.M.,
RA   Somerville C.R., Copenhaver G.P., Preuss D., Nierman W.C., White O.,
RA   Eisen J.A., Salzberg S.L., Fraser C.M., Venter J.C.;
RT   "Sequence and analysis of chromosome 2 of the plant Arabidopsis thaliana.";
RL   Nature 402:761-768(1999).
RN   [2] {ECO:0007829|PubMed:18433157}
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
RX   PubMed=18433157; DOI=10.1021/pr8000173;
RA   de la Fuente van Bentem S., Anrather D., Dohnal I., Roitinger E.,
RA   Csaszar E., Joore J., Buijnink J., Carreri A., Forzani C., Lorkovic Z.J.,
RA   Barta A., Lecourieux D., Verhounig A., Jonak C., Hirt H.;
RT   "Site-specific phosphorylation profiling of Arabidopsis proteins by mass
RT   spectrometry and peptide chip analysis.";
RL   J. Proteome Res. 7:2458-2470(2008).
RN   [3] {ECO:0007829|PubMed:19376835}
RP   IDENTIFICATION BY MASS SPECTROMETRY [LARGE SCALE ANALYSIS].
RX   PubMed=19376835; DOI=10.1104/pp.109.138677;
RA   Reiland S., Messerli G., Baerenfaller K., Gerrits B., Endler A.,
RA   Grossmann J., Gruissem W., Baginsky S.;
RT   "Large-scale Arabidopsis phosphoproteome profiling reveals novel
RT   chloroplast kinase substrates and phosphorylation networks.";
RL   Plant Physiol. 150:889-903(2009).
RN   [4] {ECO:0000313|Proteomes:UP000006548}
RP   GENOME REANNOTATION.
RC   STRAIN=cv. Columbia {ECO:0000313|Proteomes:UP000006548};
RX   PubMed=27862469; DOI=10.1111/tpj.13415;
RA   Cheng C.Y., Krishnakumar V., Chan A.P., Thibaud-Nissen F., Schobel S.,
RA   Town C.D.;
RT   "Araport11: a complete reannotation of the Arabidopsis thaliana reference
RT   genome.";
RL   Plant J. 89:789-804(2017).
CC   -!- SUBCELLULAR LOCATION: Nucleus {ECO:0000256|ARBA:ARBA00004123}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; CP002685; ANM63246.1; -; Genomic_DNA.
DR   RefSeq; NP_001325348.1; NM_001336159.1.
DR   SMR; A0A178VTI3; -.
DR   ProteomicsDB; 195511; -.
DR   EnsemblPlants; AT2G28290.5; AT2G28290.5; AT2G28290.
DR   GeneID; 817375; -.
DR   Gramene; AT2G28290.5; AT2G28290.5; AT2G28290.
DR   Araport; AT2G28290; -.
DR   TAIR; AT2G28290; SYD.
DR   OrthoDB; 1221768at2759; -.
DR   Proteomes; UP000006548; Chromosome 2.
DR   ExpressionAtlas; A0A178VTI3; baseline and differential.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:InterPro.
DR   GO; GO:0140658; F:ATP-dependent chromatin remodeler activity; IEA:InterPro.
DR   GO; GO:0042393; F:histone binding; IEA:InterPro.
DR   GO; GO:0016787; F:hydrolase activity; IEA:UniProtKB-KW.
DR   GO; GO:0006355; P:regulation of DNA-templated transcription; IEA:InterPro.
DR   GO; GO:0048731; P:system development; IEA:UniProt.
DR   CDD; cd17996; DEXHc_SMARCA2_SMARCA4; 1.
DR   CDD; cd18793; SF2_C_SNF; 1.
DR   Gene3D; 3.40.50.300; P-loop containing nucleotide triphosphate hydrolases; 1.
DR   Gene3D; 3.40.50.10810; Tandem AAA-ATPase domain; 1.
DR   InterPro; IPR014978; Gln-Leu-Gln_QLQ.
DR   InterPro; IPR014001; Helicase_ATP-bd.
DR   InterPro; IPR001650; Helicase_C.
DR   InterPro; IPR014012; HSA_dom.
DR   InterPro; IPR027417; P-loop_NTPase.
DR   InterPro; IPR029295; SnAC.
DR   InterPro; IPR038718; SNF2-like_sf.
DR   InterPro; IPR049730; SNF2/RAD54-like_C.
DR   InterPro; IPR000330; SNF2_N.
DR   PANTHER; PTHR10799:SF973; ATP-DEPENDENT HELICASE BRM; 1.
DR   PANTHER; PTHR10799; SNF2/RAD54 HELICASE FAMILY; 1.
DR   Pfam; PF00271; Helicase_C; 1.
DR   Pfam; PF14619; SnAC; 1.
DR   Pfam; PF00176; SNF2-rel_dom; 1.
DR   SMART; SM00487; DEXDc; 1.
DR   SMART; SM00490; HELICc; 1.
DR   SMART; SM00951; QLQ; 1.
DR   SMART; SM01314; SnAC; 1.
DR   SUPFAM; SSF52540; P-loop containing nucleoside triphosphate hydrolases; 2.
DR   PROSITE; PS51192; HELICASE_ATP_BIND_1; 1.
DR   PROSITE; PS51194; HELICASE_CTER; 1.
DR   PROSITE; PS51204; HSA; 1.
PE   1: Evidence at protein level;
KW   ATP-binding {ECO:0000256|ARBA:ARBA00022840};
KW   Hydrolase {ECO:0000256|ARBA:ARBA00022801, ECO:0000313|EMBL:ANM63246.1};
KW   Nucleotide-binding {ECO:0000256|ARBA:ARBA00022741};
KW   Nucleus {ECO:0000256|ARBA:ARBA00023242};
KW   Proteomics identification {ECO:0007829|PeptideAtlas:A0A178VTI3,
KW   ECO:0007829|ProteomicsDB:A0A178VTI3};
KW   Reference proteome {ECO:0000313|Proteomes:UP000006548}.
FT   DOMAIN          574..648
FT                   /note="HSA"
FT                   /evidence="ECO:0000259|PROSITE:PS51204"
FT   DOMAIN          767..934
FT                   /note="Helicase ATP-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS51192"
FT   DOMAIN          1078..1224
FT                   /note="Helicase C-terminal"
FT                   /evidence="ECO:0000259|PROSITE:PS51194"
FT   REGION          76..105
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          123..211
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          328..372
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          1343..1473
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          1501..1576
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          1589..1638
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          1691..1812
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          1831..1870
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2041..2069
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2090..2116
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2144..2163
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2180..2223
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2236..2452
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2518..2539
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2723..2760
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          2866..2885
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          3018..3046
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          3190..3209
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          3318..3338
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   REGION          3513..3575
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        79..105
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        123..172
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        173..192
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        356..372
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1357..1383
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1384..1434
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1437..1452
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1501..1516
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1555..1574
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1594..1615
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1691..1757
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1773..1787
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1796..1812
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        1837..1866
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2041..2062
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2090..2106
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2180..2197
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2286..2313
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2323..2337
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2372..2395
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2404..2421
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2433..2452
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2518..2532
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2723..2741
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        2742..2759
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        3520..3538
FT                   /note="Basic and acidic residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        3539..3563
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ   SEQUENCE   3575 AA;  389935 MW;  CE3690FE2EA84A1B CRC64;
     MTSSSHNIEL EAAKFLHKLI QDSKDEPAKL ATKLYVILQH MKTSGKENTM PYQVISRAMD
     TVVNQHGLDI EALKSSCLPH PGGTQTEDSG SAHLAGSSQA VGVSNEGKAT LVENEMTKYD
     AFTSGRQLGG SNSASQTFYQ GSGTQSNRSF DRESPSNLDS TSGISQPHNR SETMNQRDVK
     SSGKRKRGES SLSWDQNMDN SQIFDSHKID DQTGEVSKIE MPGNSGDIRN LHVGLSSDAF
     TTPQCGWQSS EATAIRPAIH KEPGNNVAGE GFLPSGSPFR EQQLKQLRAQ CLVFLALRNG
     LVPKKLHVEI ALRNTFREED GFRGELFDPK GRTHTSSDLG GIPDVSALLS RTDNPTGRLD
     EMDFSSKETE RSRLGEKSFA NTVFSDGQKL LASRIPSSQA QTQVAVSHSQ LTFSPGLTKN
     TPSEMVGWTG VIKTNDLSTS AVQLDEFHSS ADEEEGNLQP SPKYTMSQKW IMGRQNKRLL
     VDRSWSLKQQ KADQAIGSRF NELKESVSLS DDISAKTKSV IELKKLQLLN LQRRLRSEFV
     YNFFKPIATD VEHLKSYKKH KHGRRIKQLE KYEQKMKEER QRRIRERQKE FFGGLEVHKE
     KLEDLFKVRR ERLKGFNRYA KEFHKRKERL HREKIDKIQR EKINLLKIND VEGYLRMVQD
     AKSDRVKQLL KETEKYLQKL GSKLKEAKLL TSRFENEADE TRTSNATDDE TLIENEDESD
     QAKHYLESNE KYYLMAHSIK ENINEQPSSL VGGKLREYQM NGLRWLVSLY NNHLNGILAD
     EMGLGKTVQV ISLICYLMET KNDRGPFLVV VPSSVLPGWQ SEINFWAPSI HKIVYCGTPD
     ERRKLFKEQI VHQKFNVLLT TYEYLMNKHD RPKLSKIHWH YIIIDEGHRI KNASCKLNAD
     LKHYVSSHRL LLTGTPLQNN LEELWALLNF LLPNIFNSSE DFSQWFNKPF QSNGESSAEE
     ALLSEEENLL IINRLHQVLR PFVLRRLKHK VENELPEKIE RLIRCEASAY QKLLMKRVED
     NLGSIGNAKS RAVHNSVMEL RNICNHPYLS QLHSEEVNNI IPKHFLPPIV RLCGKLEMLD
     RMLPKLKATD HRVLFFSTMT RLLDVMEDYL TLKGYKYLRL DGQTSGGDRG ALIDGFNKSG
     SPFFIFLLSI RAGGVGVNLQ AADTVILFDT DWNPQVDLQA QARAHRIGQK KDVLVLRFET
     VNSVEEQVRA SAEHKLGVAN QSITAGFFDN NTSAEDRKEY LESLLRESKK EEDAPVLDDD
     ALNDLIARRE SEIDIFESID KQRKENEMET WNTLVHGPGS DSFAHIPSIP SRLVTEDDLK
     LLYETMKLND VPMVAKESTV GMKRKDGSMG GLDTHQYGRG KRAREVRSYE EKLTEEEFEK
     LCQTESPDSP QGKGEGSERS LANDTSNIPV ENSSDTLLPT SPTQAITVQP MEPVRPQSHT
     LKEETQPIKR GRGRPKRTDK ALTPVSLSAV SRTQATGNAI SSAATGLDFV SSDKRLEAAS
     HPTSSLALTS PDLSGPPGFQ SLPASPAPTP IRGRGRGRSR GRGAGRGRRV EGVLHGSNSS
     ITQRTETATS LASDAEATKF ALPRSASEIV SRVPKANEGS TSNPDQVSPV HSATTALRSD
     KAADKDLDAP PGFDSGSHVQ TLNVLENSSE RKAFAVKKRP LIQGVSSQHP GPNKQPLDLP
     VSTSSTLLGG GPVQNQNAVS SVCDGSKSPS EGRTYTALQG VTTAPSDATL PMSSQPSDAT
     LPMSSQPVGS TVEAQEANVP SLPAALPAKR RVRNLPSRGE TPKRQGKRRG QPLPATDASS
     ARSTGLTPQI EVKVGNLSGT KAKFDAVAKE QPHFSQSVAP DIHSSGSLSQ EIRRDTSGTG
     GSARKQTADV TDVARVMKEI FSETSLLKHK VGEPSATTRT NVPDAQSPGE MNLHTVETHK
     AEDSSGLKNQ EALYNLSKAD KLVSDIPHPV PGDLTTSGSV ANKDVDIGSS KVAAENELVK
     IPGGDVDSSV IQLSLGNTLT AKSSLEKCTA DQLLGEKLSQ EGETTPASDG ETCHLAEETA
     SSLSYVRSEP TASASTTAEP LPTDKLEKNI SFQDEVKTLN GDKREAILLS SEEQTNVNSK
     IETNSEELQA SRTDEVPHVD GKSVDVANQT VKEDEAKHSV EIQSSMLEPD ELPNAGQKGH
     SSIDLQPLVL VTSNENAMSL DDKDYDPISK SADIEQDPEE SVFVQGVGRP KVGTADTQME
     DTNDAKLLVG CSVESEEKEK TLQSLIPGDD ADTEQDPEES VSDQRPKVGS AYTQMEDTDE
     AKLLMGCSVE SEEKEKTLQS HIPGDDADTE KNPEESVSVQ GVDRPKVGTT DTQMEDTNDA
     KLLVGCSVAS EEKEKTLQSH IPGDDADTEQ NPEESVSVQG VNRPKVGNAN TQMEDTDEAK
     VLVGCSVESE EKEKTLQSHI PGDDADTEQN PEESVSNFDR PKDGTADTHM EDIDDAKLLV
     GCSVESEEKE KSLQSHMPSD DAVLHAPFEN TKDSKGDDLH GESLVSCPTM EVMEQKGFES
     ETHARTDSGG IDRGNEVSEN MSDGVKMNIS SVQVPDASHD LNVSQDQTDI PLVGGIDPEH
     VQENVDVPAS PHGAAPNIVI FQSEGHLSPS ILPDDVAGQL ESMSNDEKTN ISSEQVPDVS
     HDLKVSQDQT DIPPVGGIVP ENLQEIVDVP ASPHGVVPDV VVSQSEEIQS PSILPDDVPG
     QPDDGNCEKM DTMQNNTSID IGITSGKTCQ PSSSTQPEDE NRNSLSHCEP SEVVEQRDSR
     DQVCIGSVES QVEISSAILE NRSADIQPPQ SILVDQKDIE ESKEPGIESA DVSLHQLADI
     QAEPSNLVDQ MDIEESKEPG TESADVSLHQ LADIQPGPSI LVDQMDTEKS KEPGTESADV
     SLHQLADIQP GPSILVDQMD TEKSKEPGTE SADVSLHQLA DIQPGPSILV DQMDTEEFKN
     PDVSLHQLAD IEPSLSISAV QKNIEDKDQS HVETAGSELV DVSAECSTEP QVQLPPSSEP
     VGDMHVHLGA SKSEIVAEGT DFSSSLPKTE EENAKSQLAD TEPSSSLTAV QKNIEDQVET
     AGCEFVVVST GCSTEPQVQL PPSAEPVVAE GTEFPSSLLM TGVDNSSHLM TGVDNAKTHL
     ADVVPSSSPT TMEKNIEAQD QDQVTTGGCG LVDVLTECSS EPQLQLPPSA EPVISEGTEL
     ATLPLTEEEN ADSQLANIEP SSSPSVVEKN IEAQDQDQVK TAGCELVSTG CSSEPQVHLP
     PSAEPDGDIH VHLKETEKSE SMVVVGEGTA FPSSLPVTEE GNAESQLADT EPFTSPTVVE
     KNIKDQEQVE TTGCGLVDDS TGCSSEPQVQ LPPSAEPMEG THMHLEETKK SETVVTEIQL
     ADIDPSFSLI VVQTNIEDQD QIETGGCDLI NVPSGCSTEP QIQLSSSAEP EEGMHIHLEA
     AMNSETVVTE GSELPSSLPM TEDENADGQL AEVEPSVSLT VEQTNIEEKD HIETAECELV
     DVSPGCSSQP EVKFPPSPDA VGGMDVHLET VVTEDTDSNS SLPKTEEKDA ENPSDRLDGE
     SDGTTVATVE GTCVESNSLV AEESNIEVPK DNEDV
//
DBGET integrated database retrieval system