>TIGR00755 ksgA dimethyladenosine transferase; InterPro: IPR011530 This family of proteins represent the rRNA adenine dimethylases (e.g. KsgA). The bacterial enzyme KsgA catalyzes the transfer of a total of four methyl groups from S-adenosyl-l-methionine (S-AdoMet) to two adjacent adenosine bases in 16S rRNA. This enzyme and the resulting modified adenosine bases appear to be conserved in all species of eubacteria, eukaryotes, and archaea, and in eukaryotic organelles. Bacterial resistance to the aminoglycoside antibiotic kasugamycin involves inactivation of KsgA and resulting loss of the dimethylations, with modest consequences to the overall fitness of the organism. In contrast, the yeast ortholog, Dim1, is essential. In yeast, and presumably in other eukaryotes, the enzyme performs a vital role in pre-rRNA processing in addition to its methylating activity. The best conserved region in these enzymes is located in the N-terminal section and corresponds to a region that is probably involved in S-adenosyl methionine (SAM) binding. The crystal structure of KsgA from Escherichia coli has been solved to a resolution of 2.1A. It bears a strong similarity to the crystal structure of ErmC' from Bacillus stearothermophilus and a lesser similarity to the yeast mitochondrial transcription factor, sc-mtTFB .; GO: 0016433 rRNA (adenine) methyltransferase activity, 0006364 rRNA processing.

Probab=100.00 E-value=0 Score=581.34 Aligned_cols=254 Identities=41% Similarity=0.679 Sum_probs=230.4 Q ss_pred CCCCCCCCCCCCCCHHHHHHHHHHCCCCCCCEEEEECCCCCHHHHHHHHCCCCE-EEEECCCCCCHHHHHHHHH--HHHC Q ss_conf 984336584112398999999997198999879997589882346775023525-9984255430368878753--2200 Q gi|254780398|r 19 IIPKKYMGQNFLLDLNILKKIAESSGSLDGITVIEIGAGPGNLTQMLLTLGARK-VIVIEKDQQFFPILKDISS--QHPN 95 (284) Q Consensus 19 ~~p~k~lGQnFL~d~~i~~~iv~~~~~~~~~~VlEIGpG~G~LT~~Ll~~~~~~-v~aiEiD~~~~~~l~~~~~--~~~~ 95 (284) T Consensus 1 ~~p~K~lGQnFL~D~~~~~~Iv~~~~~~~~~~vlEIGPG~G~LT~~Ll~~~-~~~v~aiEiD~~l~~~L~~~~~~~~~-~ 78 (277) T TIGR00755 1 FRPRKSLGQNFLIDESVIQKIVEAANVLENDVVLEIGPGLGALTEPLLKRA-KKLVTAIEIDPRLAEILRKLLSEKLY-E 78 (277) T ss_pred CCCCCCCCCCEEECHHHHHHHHHHHCCCCCCEEEEECCCCHHHHHHHHHHC-CCEEEEEEECHHHHHHHHHHCCCCCC-C T ss_conf 977642276024087899999997437899779997388207899999825-98489997267899998752154332-4 Q ss_pred CCCCCHHHHCCCCHH---HHCCCCCCEEEEECCCHHHHHHHHHHHHHHHCCCCCCCHHHHEEEHHHHHHHHHCCCHHHHH Q ss_conf 122000000014315---52133222011202322467889999985201000000110203344788753012312332 Q gi|254780398|r 96 RLEIIQDDALKVDFE---KFFNISSPIRIIANLPYNIGTRLLFNWISADTWPPFWESLTLLFQKEVGERITAQKNSPHYG 172 (284) Q Consensus 96 ~~~ii~~Dal~~d~~---~~~~~~~~~~vvgNLPYnIss~Il~~ll~~~~~~~~~~~~vlmvQkEvA~Rl~a~pg~k~Yg 172 (284) T Consensus 79 ~~~~i~~Dalk~~~~~~~~~~~~-~~~~vv~NLPY~Issp~~~~Ll~~~-~~~~~~~~vlM~QkEvA~Rl~A~p~sk~Yg 156 (277) T TIGR00755 79 NLEVIEGDALKVDLNSLEDFPKE-DKLKVVSNLPYNISSPLIFKLLKEE-EKPKFRLAVLMVQKEVAERLTAKPGSKDYG 156 (277) T ss_pred CEEEEECCEEEECCCHHHHCCCC-CCCEEEEECCCCHHHHHHHHHHHHH-CCCCCCEEEEEEEHHHHHHHCCCCCCCCCH T ss_conf 25787144454123204331678-9857985077432489999999861-364447778874267777651899984100 Q ss_pred HHHHHHCCCCCEEEECCCCCCEECCCCCCCEEEEEECCCCCC----C-CCCHHHHHHHHHHHHCCCCHHHHHHHH----- Q ss_conf 345432013320120001100001057875788730125885----5-347678999999997273138999876----- Q gi|254780398|r 173 RLSVLTGWRTKATMMFDISPHVFFPSPKVTSTVIHFIPHLNP----I-PCCLESLKKITQEAFGKRRKTLRQSLK----- 242 (284) Q Consensus 173 ~LSv~~q~~~~v~~~~~V~~~~F~P~PkVdS~vi~l~pk~~~----~-~~~~~~~~~~~~~~F~~RRK~l~~~L~----- 242 (284) T Consensus 157 ~LSV~~q~~~~V~~v~~V~P~aF~P~PkV~Savv~l~~~~~~p~~~~~~~~~~~~~~l~~~~F~~RRK~l~n~L~~~~~~ 236 (277) T TIGR00755 157 RLSVLVQYLANVEIVFKVPPSAFYPPPKVDSAVVRLIPRENKPKPLPLVKDIALFEKLLKAAFSQRRKTLRNNLKNSLKD 236 (277) T ss_pred HHHHHHHHHHEEEEEEEECCCCCCCCCCCEEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHHCCCCCHHHHHHHHHHHH T ss_conf 69888746522268687378344288820489999987589998511367799999999998617871015556542221 Q ss_pred HCCCH----HHHHHCCCCCC---CCHHCCCHHHHHHHHHHH Q ss_conf 31817----89997877746---571208999999999998 Q gi|254780398|r 243 RLGGE----NLLHQAGIETN---LRAENLSIEDFCRITNIL 276 (284) Q Consensus 243 ~~~~~----~~l~~~~i~~~---~R~e~Ls~~~~~~L~~~l 276 (284) T Consensus 237 ~~~~~~~~~~~l~~~~~~~~~~~~R~e~L~~~df~~L~~~l 277 (277) T TIGR00755 237 NLLAKEKLEEVLEQLGLDPTKLNARAEQLSPEDFLRLANLL 277 (277) T ss_pred CCCCHHHHHHHHHHHCCCCCCHHCCHHCCCHHHHHHHHHHC T ss_conf 01112456667887088865000661114889999999609

HHsearch alignment for GI: 254780398 and conserved domain: TIGR00755