>TIGR00228 ruvC crossover junction endodeoxyribonuclease RuvC; InterPro: IPR002176 The Escherichia coli ruvC gene is involved in DNA repair and in the late step of RecE and RecF pathway recombination . RuvC protein (3.1.22.4 from EC) cleaves cruciform junctions, which are formed by the extrusion of inverted repeat sequences from a super-coiled plasmid and which are structurally analogous to Holliday junctions, by introducing nicks into strands with the same polarity. The nicks leave a 5'terminal phosphate and a 3'terminal hydroxyl group which are ligated by E. coli or Bacteriophage T4 DNA ligases. Analysis of the cleavage sites suggests that DNA topology rather than a particular sequence determines the cleavage site. RuvC protein also cleaves Holliday junctions that are formed between gapped circular and linear duplex DNA by the function of RecA protein. The active form of RuvC protein is a dimer. This is mechanistically suited for an endonuclease involved in swapping DNA strands at the crossover junctions. It is inferred that RuvC protein is an endonuclease that resolves Holliday structures in vivo . RucC is a small protein of about 20 kD. It requires and binds a magnesium ion. The structure of E. coli ruvC is a 3-layer alpha-beta sandwich containing a 5-stranded beta-sheet sandwiched between 5 alpha-helices .; GO: 0004520 endodeoxyribonuclease activity, 0006281 DNA repair, 0006310 DNA recombination.

Probab=90.74 E-value=0.051 Score=32.86 Aligned_cols=109 Identities=11% Similarity=0.129 Sum_probs=56.1 Q ss_pred EEEEECCCCEEEEEE----EECCCCEECCCEEEECCC----CCHHHHHHHHHHHHHCCCEEEEEECCCCCC-CCCHHHHH Q ss_conf 999986887689996----307651101210110477----415689899998651677589972135788-88844799 Q gi|254780976|r 19 IASIDLGTKRIGLAI----SDPGRRFAHPRPFLVRKK----VTQTALELLSFITTENIAAFIIGLPLNMNG-SEGPRVHS 89 (160) Q Consensus 19 iLgiD~G~kriGiAi----sd~~~~~a~Pl~~i~~~~----~~~~~~~l~~ii~e~~i~~iVvGlP~~~~g-~~~~~~~~ 89 (160) T Consensus 1 ILGIDPGSR~~GY~vI~~~~~~L~~l~~G~I~~~~~~L~~~l~~~~~~~~~~~~~f~~n~~AIE~vF~a~N~~S~lKL~Q 80 (158) T TIGR00228 1 ILGIDPGSRVTGYGVIRQAGKKLSYLGSGFIRIKVTDLPERLKDIYAGVTEIITQFQPNEFAIEQVFMAKNADSALKLGQ 80 (158) T ss_pred CCCCCCCCCCHHHHHHHHHHHHHHHHHCCEEEEEHHHHHHHHHHHHHHHHHHHHHHCCCCCHHHHHHHCCCHHHHHHHHH T ss_conf 97768987511258988753443334245003303468899999999999998430666001212432027257888764 Q ss_pred HHHHHHHHHHHCCCCCEEEECCCCCHHHHHHHHHHCCCCHHH Q ss_conf 999999998404899779983671679999999986986445 Q gi|254780976|r 90 TRAFVHNMIDRKVYVPFVFWDERLTTVSAQQILIDMNVSRKK 131 (160) Q Consensus 90 v~~f~~~L~~~~~~l~v~~~DEr~TS~~A~~~l~~~g~~~k~ 131 (160) T Consensus 81 ~RG~A~~~-~v~~~l~~F---sEY~~~~VK~~~~G~G~A~K~ 118 (158) T TIGR00228 81 ARGVAIVA-AVNERLPVF---SEYAARQVKKTVVGIGSAAKE 118 (158) T ss_pred HHHHHHHH-HHHHHCCCC---CHHHHHHHHHHHCCCCCCCHH T ss_conf 44699999-998626873---105577665653057730038

HHsearch alignment for GI: 254780976 and conserved domain: TIGR00228