>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=97.19 E-value=0.00057 Score=45.10 Aligned_cols=168 Identities=17% Similarity=0.200 Sum_probs=105.9 Q ss_pred HHHCCCHHHHHHHHHHEEECCCCCC-CEEEEECCCCCHHHHHHHHCCCE-EEEECCCHHHHHHHHHHHHHCCCCCEEEEE Q ss_conf 3312357787755442011147788-33886024642358888506856-998447588999999978860899649997 Q gi|254781000|r 186 SFTQPNAGINVHMLEWVLAATKGIQ-GDLLELYCGNGNFSLVLARHFDR-VLAVEIAKPSVEAARYNIAANHVNNVKIVR 263 (371) Q Consensus 186 sFfQ~N~~~~~~l~~~v~~~~~~~~-~~vlDLycG~G~fsl~La~~~~~-V~gvE~~~~ai~~A~~Na~~N~i~n~~f~~ 263 (371) T Consensus 6 ~lGQ-nFL~D~~~~~~Iv~~~~~~~~~~vlEIGPG~G~LT~~Ll~~~~~~v~aiEiD~~l~~~L~~~~~~~~~~~~~~i~ 84 (277) T TIGR00755 6 SLGQ-NFLIDESVIQKIVEAANVLENDVVLEIGPGLGALTEPLLKRAKKLVTAIEIDPRLAEILRKLLSEKLYENLEVIE 84 (277) T ss_pred CCCC-CEEECHHHHHHHHHHHCCCCCCEEEEECCCCHHHHHHHHHHCCCEEEEEEECHHHHHHHHHHCCCCCCCCEEEEE T ss_conf 2276-024087899999997437899779997388207899999825984899972678999987521543324257871 Q ss_pred CCHHHHHHHHHHCCCCCCCCCCHHCCCCCC--EEEECCCCCCHHHHHHHHHH---C--CCC-EEEEEC--------CHHH Q ss_conf 689999898862332222321010147877--99986970263489999985---3--994-899929--------9899 Q gi|254781000|r 264 MSSKEFTQAMRREREFNRLKDIDIHSYRFK--TIFVDPPRSGLDDATVGMVQ---A--YPH-ILYISC--------NPDS 327 (371) Q Consensus 264 ~~a~~~~~~~~~~~~~~~~~~~~~~~~~~d--~vilDPPR~G~~~~~~~~~~---~--~~~-ivYVSC--------np~T 327 (371) T Consensus 85 ~Dalk~~~~------------~~~~~~~~~~~~vv~NLPY~Issp~~~~Ll~~~~~~~~~~~vlM~QkEvA~Rl~A~p~s 152 (277) T TIGR00755 85 GDALKVDLN------------SLEDFPKEDKLKVVSNLPYNISSPLIFKLLKEEEKPKFRLAVLMVQKEVAERLTAKPGS 152 (277) T ss_pred CCEEEECCC------------HHHHCCCCCCCEEEEECCCCHHHHHHHHHHHHHCCCCCCEEEEEEEHHHHHHHCCCCCC T ss_conf 444541232------------04331678985798507743248999999986136444777887426777765189998 Q ss_pred HHH-HHHHHCC-CCEEE---EEEEEECCCCCCCEEE-EEEEEECCC Q ss_conf 988-6998426-96799---9999717989872489-999998561 Q gi|254781000|r 328 LCR-DLSILST-THTIE---RLALFDQFPYTRHMEC-GVLLVRKPS 367 (371) Q Consensus 328 lar-D~~~l~~-gy~i~---~~~~~D~FP~T~HvE~-v~~l~R~~~ 367 (371) T Consensus 153 k~Yg~LSV~~q~~~~V~~v~~V~P~aF~P~-PkV~Savv~l~~~~~ 197 (277) T TIGR00755 153 KDYGRLSVLVQYLANVEIVFKVPPSAFYPP-PKVDSAVVRLIPREN 197 (277) T ss_pred CCCHHHHHHHHHHHEEEEEEEECCCCCCCC-CCCEEEEEEEEECCC T ss_conf 410069888746522268687378344288-820489999987589

HHsearch alignment for GI: 254781000 and conserved domain: TIGR00755