Protein: DNA replication ATP-dependent helicase/nuclease dna2 [Includes: DNA replication nuclease dna2 (EC 3.1.-.-); DNA replication ATP-dependent helicase dna2 (EC 3.6.4.12)] (Q9URU2)
Organism: Schizosaccharomyces pombe (strain 972 / ATCC 24843) (Fission yeast)
Function: Key enzyme involved in DNA replication and DNA repair. Involved in Okazaki fragments processing by cleaving long flaps that escape fen1: flaps that are longer than 27 nucleotides are coated by replication protein A complex (RPA), leading to recruit dna2 which cleaves the flap until it is too short to bind RPA and becomes a substrate for fen1. Is a target of the intra-S phase checkpoint, associating with stalled replication forks when phosphorylated at Ser-219 and preventing the stalled replication forks from reversing. Also involved in 5'-end resection of DNA during double-strand break (DSB) repair by mediating the cleavage of 5'-ssDNA. Also required for the production of G-rich single-strand overhangs at telomere ends and thus in telomere length maintenance. Possesses different enzymatic activities, such as single-stranded DNA (ssDNA)-dependent ATPase, 5'-3' helicase and endonuclease activities. While the ATPase and endonuclease activities are well-defined and play a key role in Okazaki fragments processing and DSB repair, the 5'-3' DNA helicase activity is atypical: it cannot load onto its tracking strand internally and has an absolute free 5'-end requirement. Helicase activity may promote the motion of dna2 on the flap, helping the nuclease function.
Subcellular location: Cytoplasm. Nucleus. Chromosome, telomere. Note=Recruited to double-strand. break (DSB) sites.
Interaction partners:
- Exodeoxyribonuclease 1
- Flap endonuclease 1
- RecQ-mediated genome instability protein 1
- ATP-dependent DNA helicase pfh1
- Minichromosome loss protein 1
- Replication factor A protein 1
- Cell division control protein 24
- DNA topoisomerase 3
- Double-strand break repair protein rad32
- DNA repair and recombination protein rad22
Sequence:
MFNDQSKTTSSVKGICATTDNNHGNLKKTNSTPFRKNYLLNGRTKLKLENFAYNASTEISSPKISEKKHSSLPIKRKNTFNESSTSFSPFTKAHKEITDDLKPDKSFTRKSDLNSQDMPVCFQETSKDLCRSSSTQHLLDHQTTDSTIIDMKPVSTNSKSDVFTLYTDETVLLRRCASDNKPLINNNLSSSNVSENQSRSFGSYDEVKNQGNNLHKVPSLVSIIRNARSSEQSRIAANSSCLLKGSDTEIDEDDFALEAEDLAALDSLERQYSQLPNSTVTASAKDIEKTAKVNHVGGDLQSYCSATKASDATINEEPVNLALDKACNSLPDINSDFIDDWDDSCDGCTPGELCEFSSEYTVLEVHEDFIFHEGNHFRQLKLILEANDILHQLFLRGDWTETSIFVGDSIRVEATFDKDNTAIVDNDKGLIIIHPKILMSATAVASSFPCLRKAVISDRVGIYGPPTKAMVTGNILHDFFQHALYRGIDALENVDINLETSIKTYISDIYFADLSLDEIREELDARLPLLKSIVERYLISKKNDNNNESIHISRLLDIEESIWSPRFGLKGNIDATVEVVLTEKPESSSTLTLPLELKTGRYVDNISHFAQSLLYTLLISDRYGINTNQALLCYLENSTIKNLVASNSQLRGLIMTRNSLAQHNFRRSLPEMISNRKICDHCSLVSECLFFQKMSDKGVANSNGLTESWNEWMREVKDEDLEFYKKWEKLLNQEERLLLLKRGDVLTFDTEELEAYGKTLYPLYITKEDIVCLEIDDRVFHYKFAFLNDNGYPRNFLHSGFSVGERVFISDEHGHWSLAKGHIVHIQDSCIEVRTRHRLHIPWLKMPNFDFKKNQVFFGNYEDSKLSFIGSNHTRYRIDKDEFSSGIASIRGTLMSSVLPDAPLIIRDMIIRLKPPKFCNSALIDPEFLKCLNEDQITALKKCHAAEHYSLILGMPGTGKTTTISSLIRSLLAKKKKILLTSFTHLAVDNILIKLKGCDSTIVRLGSPHKIHPLVKEFCLTEGTTFDDLASLKHFYEDPQIVACSSLGVYHSIFNKRKFDYCIIDEASQIPLPICLGPLQLAEKFVLVGDHYQLPPLVKNSRTSKDGLSLSLFKLLSEKHPEAVTTLRLQYRMNEDINSLSSELIYGGNLVCGSKTISQKKLILPKAHLSDGLPDSSSSLHWVNKLINPSHSVIFFNTDDILGVESKTNNILENHTEAFLIEQAVSSFLERGVKQSSIGIISIYKSQVELLSKNLKSFTEIEINTVDRYQGRDKDIILISFVRSNSKNLVGELLRDWHRLNVALSRAKVKCIMFGSLSTLSSSNIVSHLLKLLEKNKWIFTLNENDIATKFDENSSPIKDCSQVATTNNAKVIIRKNQRFFNSDNLCEKAILPQLEF