>TIGR00614 recQ_fam ATP-dependent DNA helicase, RecQ family; InterPro: IPR004589 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: 0008026 ATP-dependent helicase activity, 0006310 DNA recombination.

Probab=99.41 E-value=2.5e-12 Score=89.96 Aligned_cols=169 Identities=20% Similarity=0.233 Sum_probs=111.1 Q ss_pred CCCHHHHHHHHHHHHCC-CCEEEECCCCCHHHH-HHHHHHHHHHCCCCCEEEEEC-CCCCHHHHHHHHHHHCCCCCCEEE Q ss_conf 13489999999999679-819996899988999-999999997408994899723-310137889999851553460699 Q gi|254780129|r 4 VLKPHQIVMVNWLLSHD-RCALWASMGSGKTVS-VLFALSTIKILDPRPVLIIAP-LRVAQYVWKDEVERWSAFSDMTVS 80 (220) Q Consensus 4 ~Lrp~Q~~a~~~~~~~~-~~~l~~~~G~GKT~~-ai~~~~~~~~~~~~~~LIi~P-~s~~~~~W~~e~~~~~~~~~~~~~ 80 (220) T Consensus 11 ~Frp~Q~e~I~~~L~g~RD~~vvMpTG~GKSLCYQ~Pa~~---~--~G~t~VIsPLiSLm~DQ-V~~L~~----~~i~A~ 80 (497) T TIGR00614 11 SFRPVQLEVINAVLEGRRDCLVVMPTGGGKSLCYQLPALY---S--DGLTLVISPLISLMEDQ-VLQLKA----SGIPAT 80 (497) T ss_pred CCCHHHHHHHHHHHCCCCCEEEEECCCCCHHHHHHHHHHH---C--CCCEEEECCHHHHHHHH-HHHHHH----CCCCEE T ss_conf 4551489999987548975699815898603676405675---0--89649973636568999-999874----486301 Q ss_pred EEECCCCCC--C----CC--CCCCCCEEEECHHHHHCC------CCCCCCCCCCCCCCCCHHHCCCCCCCCCHHHHHHHH Q ss_conf 861121011--2----23--456766278656673100------000000247200002512201365433203699999 Q gi|254780129|r 81 SLIGSERQR--I----KA--LNTPAHLYIINFENIPWL------VKMKLDHWDFATIVVDESTKLKSFRTHQGTKQTRAL 146 (220) Q Consensus 81 ~~~~~~~~~--~----~~--~~~~~~~~i~~~~~l~~~------~~~~~~~~~~~~iIiDEaH~~kn~~~~~~~k~~k~l 146 (220) T Consensus 81 ~L~s~~s~~~~~~v~~~~~~k~g~~kllYvtPE~~~~~~~ll~~Le~~Y~~~~~~~iAvDEAHCiSq-WGHDFR~~Y~~L 159 (497) T TIGR00614 81 FLNSSQSKEQQKEVLTDLSKKDGKLKLLYVTPEKISKSKSLLQTLEKLYERKGITLIAVDEAHCISQ-WGHDFRPDYKAL 159 (497) T ss_pred CCCCCCCHHHHHHHHHHHHHHCCCEEEEEECHHHHHCCHHHHHHHHHHHHHCCCEEEEEECEEEECC-CCCCCCHHHHHH T ss_conf 0443257789999999987307975899716346534647899999988644966999832154358-888740799996 Q ss_pred HHHHH-CCCCEEEEECCCCCCCCHHHHHHHHHHHCCCC Q ss_conf 99851-37987998316532488899999999828885 Q gi|254780129|r 147 GKVAF-SKVKRFIELTGTPSPNGLIDLWGQIWFLDKGK 183 (220) Q Consensus 147 ~~~~~-~~~~~~l~LTgTPi~n~~~el~~ll~~l~p~~ 183 (220) T Consensus 160 G~Lk~~fP~vP~~ALTATA~~~~~~Di~~~L~l~~p~~ 197 (497) T TIGR00614 160 GSLKQKFPNVPIMALTATASPSVREDILRILNLKNPQV 197 (497) T ss_pred HHHHHHCCCCCEEEEECCCCHHHHHHHHHHHCCCCCCE T ss_conf 57888548874364340578678999998722136624

HHsearch alignment for GI: 254780129 and conserved domain: TIGR00614