>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=92.64 E-value=0.58 Score=25.73 Aligned_cols=90 Identities=11% Similarity=0.239 Sum_probs=56.9 Q ss_pred ECCCCHHHHHHHHHHH--------------C-CCCEEEEECCHHHHHHHHHHHHHHCCCC---EEEEEEECCCCCCCCCC Q ss_conf 3376469999999997--------------1-9978999316346899999999867898---38998621344442101 Q gi|254780991|r 176 VTGSGKTFTMAKVIEA--------------M-QRPAIVMAPNKILAAQLYSEFKNFFPHN---AVEYFVSYYDYYQPEAY 237 (805) Q Consensus 176 VTGSGKTevya~lI~~--------------~-gr~aLvLvPei~La~QL~~rfk~~Fp~n---~V~~f~S~~~~yqpEay 237 (805) T Consensus 194 ~~SFdRpNl~~~v~~k~n~~~~l~~yl~~~~~G~SGIIY----a~sR~~VE~~~~~L~s~G~~A~~Y-HAGL~------- 261 (607) T TIGR01389 194 ISSFDRPNLRFSVVKKNNKKKFLLEYLKKHREGQSGIIY----ASSRKKVEELAERLESQGISALAY-HAGLS------- 261 (607) T ss_pred CCCCCCHHHHHHHHHHCCCCHHHHHHHHCCCCCCCEEEE----CCCHHHHHHHHHHHHHCCCCEEEC-CCCCC------- T ss_conf 256775114334312037813689997507999534787----677045899999997479620403-67987------- Q ss_pred CCCCCCCHHHHCCCCHHHHHHHHHHHHHHHCCCCEEEECCHHHHCCCCCHHHHHCCEEEE Q ss_conf 555432102210358899999999999985499849982778961689834772257999 Q gi|254780991|r 238 VPRTDTYIEKESSINEQIDRMRHSATRSLLERNDCIVVSSVSCIYGIGSVESYSQMIVQL 297 (805) Q Consensus 238 ~p~~d~~i~k~~s~n~~i~~~R~~a~~~l~~~~~~IVVgsrSAIfgl~~P~~~lglIIvd 297 (805) T Consensus 262 ------------------~~~R~e~Q~~Fl~d~~~vmVAT~A--FGMGIdKpnVRFViH~ 301 (607) T TIGR01389 262 ------------------NKVRAENQEDFLYDDVKVMVATNA--FGMGIDKPNVRFVIHA 301 (607) T ss_pred ------------------HHHHHHHHHHHHHHCCEEEEEEEC--CCCCCCCCCCCEEEEE T ss_conf ------------------768999975444625548888712--3587478765488863

HHsearch alignment for GI: 254780991 and conserved domain: TIGR01389