>gnl|CDD|132877 cd07180, RNaseH_typeII_Archaea_like, Archaeal ribonuclease HII. Ribonuclease (RNase) H is classified into two families, type I (prokaryotic RNase HI, eukaryotic RNase H1 and viral RNase H) and type II (prokaryotic RNase HII and HIII, archaeal RNase HII and eukaryotic RNase H2/HII). RNase H endonucleolytically hydrolyzes an RNA strand when it is annealed to a complementary DNA strand in the presence of divalent cations, in DNA replication or repair. Some archaeal RNase HII show broad divalent cation specificity. It is proposed that three of the four acidic residues at the active site are involved in metal binding and the fourth one involved in the catalytic process in archaea. Most archaeal genomes contain multiple RNase H genes. Despite a lack of evidence for homology from sequence comparisons, type I and type II RNase H share a common fold and similar steric configurations of the four acidic active-site residues, suggesting identical or very similar catalytic mechanisms. It appears that type I and type II RNases H also have overlapping functions in cells, as over-expression of Escherichia coli RNase HII can complement an RNase HI deletion phenotype in E. coli. Length = 204

 Score =  111 bits (279), Expect = 2e-25
 Identities = 60/174 (34%), Positives = 88/174 (50%), Gaps = 24/174 (13%)

Query: 27  AGIDEVGRGALAGPVVVAAIILDPNNIPF----GINDSKKISHKKREELYEKITSSAI-I 81
            GIDE GRG + GP+VVA + +D  ++      G+ DSKK++ KKREELY +I   A  +
Sbjct: 1   CGIDEAGRGPVIGPMVVAGVAIDEESLKKLKSLGVKDSKKLTPKKREELYNEILKVADDV 60

Query: 82  SISSASHQYIDK----HNIHKATLDAIYHAVENLQVIPRSALID---------GRSIPED 128
            I   S + ID+    HN+++   +A    +  L   P    +D            + E 
Sbjct: 61  VIVIVSPEEIDERREAHNLNELEAEAFAELINRLSDKPDIVYVDACDVNEERFAEELRER 120

Query: 129 LP--CQAFAVIKGDSISLSIAAASIIAKVTRDRLMRIAHKKYPDYGFDSHVGYP 180
           L    +  A  K D+    ++AASIIAKV RDR +    ++Y D+G  S  GYP
Sbjct: 121 LNSGVEVIAEHKADAKYPVVSAASIIAKVERDREIEELKEEYGDFG--S--GYP 170