>TIGR01389 recQ ATP-dependent DNA helicase RecQ; InterPro: IPR006293 The ATP-dependent DNA helicase RecQ (3.6.1 from EC) is involved in genome maintenance . All homologues tested to date unwind paired DNA, translocating in a 3' to 5' direction and several have a preference for forked or 4-way DNA structures (e.g. Holliday junctions) or for G-quartet DNA. The yeast protein, Sgs1, is present in numerous foci that coincide with sites of de novo synthesis DNA, such as the replication fork, and protein levels peak during S-phase. A model has been proposed for Sgs1p action in the S-phase checkpoint response, both as a 'sensor' for damage during replication and a 'resolvase' for structures that arise at paused forks, such as the four-way 'chickenfoot' structure. The action of Sgs1p may serve to maintain the proper amount and integrity of ss DNA that is necessary for the binding of RPA (replication protein A, the eukaryotic ss DNA-binding protein)DNA pol complexes. Sgs1p would thus function by detecting (or resolving) aberrant DNA structures, and would thus contribute to the full activation of the DNA-dependent protein kinase, Mec1p and the effector kinase, Rad53p. Its ability to bind both the large subunit of RPA and the RecA-like protein Rad51p, place it in a unique position to resolve inappropriate fork structures that can occur when either the leading or lagging strand synthesis is stalled. Thus, RecQ helicases integrate checkpoint activation and checkpoint response. ; GO: 0004003 ATP-dependent DNA helicase activity, 0006310 DNA recombination, 0009432 SOS response.

Probab=99.41 E-value=2.5e-12 Score=89.96 Aligned_cols=170 Identities=19% Similarity=0.249 Sum_probs=115.6 Q ss_pred CCCHHHHHHHHHHHHCCCCEEEECCCCCHHHH-HHHHHHHHHHCCCCCEEEEECC-CCCHHHHHHHHHHHCCCCCCEEEE Q ss_conf 13489999999999679819996899988999-9999999974089948997233-101378899998515534606998 Q gi|254780129|r 4 VLKPHQIVMVNWLLSHDRCALWASMGSGKTVS-VLFALSTIKILDPRPVLIIAPL-RVAQYVWKDEVERWSAFSDMTVSS 81 (220) Q Consensus 4 ~Lrp~Q~~a~~~~~~~~~~~l~~~~G~GKT~~-ai~~~~~~~~~~~~~~LIi~P~-s~~~~~W~~e~~~~~~~~~~~~~~ 81 (220) T Consensus 13 ~FR~gQe~II~~vL~g~~~l~vmPTGGGKSlCYQ~PALl---l--~Glt~VISPLIsLMkDQ-Vd~L~~----~Gv~Aa~ 82 (607) T TIGR01389 13 DFRGGQEEIIEHVLDGRDVLVVMPTGGGKSLCYQVPALL---L--KGLTVVISPLISLMKDQ-VDQLRA----AGVAAAY 82 (607) T ss_pred CCCCHHHHHHHHHHCCCCEEEECCCCCCHHHHHHHHHHH---H--CCCEEEECCHHHHHHHH-HHHHHH----CCCEEEE T ss_conf 677315899999847798589738998512777217887---2--89879984236314779-999986----0701452 Q ss_pred EECC--CCCCC----CCCCCCCCEEEECHHHHHC-CCCCCCCCCCCCCCCCCHHHCCCCCCCCCHHHHHHHHHHHH--HC Q ss_conf 6112--10112----2345676627865667310-00000002472000025122013654332036999999985--13 Q gi|254780129|r 82 LIGS--ERQRI----KALNTPAHLYIINFENIPW-LVKMKLDHWDFATIVVDESTKLKSFRTHQGTKQTRALGKVA--FS 152 (220) Q Consensus 82 ~~~~--~~~~~----~~~~~~~~~~i~~~~~l~~-~~~~~~~~~~~~~iIiDEaH~~kn~~~~~~~k~~k~l~~~~--~~ 152 (220) T Consensus 83 lNSt~s~~E~~~i~~~~~~G~~~LLYvAPERL~~~~Fl~~L~~~~i~L~AvDEAHCvSQ-WGHDFRPeY~~L~~l~~~fp 161 (607) T TIGR01389 83 LNSTLSAKEQQEIEKALVNGELKLLYVAPERLEQDYFLNMLKRLTIALLAVDEAHCVSQ-WGHDFRPEYRRLGELAERFP 161 (607) T ss_pred ECCCCCHHHHHHHHHHHHCCCEEEEEECCHHHHHHHHHHHHHCCCCEEEEEECCCCCCC-CCCCCCHHHHHHHHHHHHCC T ss_conf 03778888999999998419815775167132118999887319930899832502166-88887565899999998678 Q ss_pred CCCEEEEECCCCCCCCHHHHHHHHHHHCCCCC Q ss_conf 79879983165324888999999998288853 Q gi|254780129|r 153 KVKRFIELTGTPSPNGLIDLWGQIWFLDKGKR 184 (220) Q Consensus 153 ~~~~~l~LTgTPi~n~~~el~~ll~~l~p~~~ 184 (220) T Consensus 162 ~~P~~iALTATAd~~t~~DI~~~L~L~~~~~f 193 (607) T TIGR01389 162 QVPTRIALTATADAETRQDIVELLRLKDANEF 193 (607) T ss_pred CCCEEEEEECCCCHHHHHHHHHHCCCCCCCCC T ss_conf 98669987248998789999997088986541

HHsearch alignment for GI: 254780129 and conserved domain: TIGR01389