>TIGR00452 TIGR00452 methyltransferase, putative; InterPro: IPR010017 Methyl transfer from the ubiquitous S-adenosyl-L-methionine (AdoMet) to either nitrogen, oxygen or carbon atoms is frequently employed in diverse organisms ranging from bacteria to plants and mammals. The reaction is catalyzed by methyltransferases (Mtases) and modifies DNA, RNA, proteins and small molecules, such as catechol for regulatory purposes. The various aspects of the role of DNA methylation in prokaryotic restriction-modification systems and in a number of cellular processes in eukaryotes including gene regulation and differentiation is well documented. Three classes of DNA Mtases transfer the methyl group from AdoMet to the target base to form either N-6-methyladenine, or N-4-methylcytosine, or C-5- methylcytosine. In C-5-cytosine Mtases, ten conserved motifs are arranged in the same order . Motif I (a glycine-rich or closely related consensus sequence; FAGxGG in M.HhaI ), shared by other AdoMet-Mtases , is part of the cofactor binding site and motif IV (PCQ) is part of the catalytic site. In contrast, sequence comparison among N-6-adenine and N-4-cytosine Mtases indicated two of the conserved segments , although more conserved segments may be present. One of them corresponds to motif I in C-5-cytosine Mtases, and the other is named (D/N/S)PP(Y/F). Crystal structures are known for a number of Mtases , , , . The cofactor binding sites are almost identical and the essential catalytic amino acids coincide. The comparable protein folding and the existence of equivalent amino acids in similar secondary and tertiary positions indicate that many (if not all) AdoMet-Mtases have a common catalytic domain structure. This permits tertiary structure prediction of other DNA, RNA, protein, and small-molecule AdoMet-Mtases from their amino acid sequences . This is a set of proteobacterial proteins, which have homology in their central region to a large number of methyltransferases active on a variety of substrates. .

Probab=96.96  E-value=0.0016  Score=41.73  Aligned_cols=109  Identities=16%  Similarity=0.188  Sum_probs=69.1

Q ss_pred             CCCCCCEEEECCCCCCCCHHHHHCCCCCCHHHHHHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHCCCCCCCCCCC
Q ss_conf             45589678611001222100110168733011100012356676420013322100223445665421003444431015
Q gi|254780405|r   45 VFLDSTRMLNIFAGTGSVGFEALSRGCHYVLFVDNNSESIRLIRRNSELLGVEKNCNIFFRDVLRLGKIGNISPFQLVYL  124 (189)
Q Consensus        45 ~~~~~~~vlDlfaGsG~lgiEalSrGA~~v~~vE~~~~a~~~lk~N~~~~~~~~~~~ii~~D~~~~~~~~~~~~fDiIf~  124 (189)
T Consensus       118 ~pL~~~~i~DVGC~~GY~~~~M~~~Gak~~VG~DP~~L~~~QFE~~~~ll~~~~~~~l~~LGiE~l~~-~~pnAFD~vFs  196 (316)
T TIGR00452       118 SPLKGRTILDVGCGSGYHLWRMLGEGAKLLVGIDPTELFLCQFEAVRKLLDNDKRAILLPLGIEQLQE-LKPNAFDTVFS  196 (316)
T ss_pred             CCCCCCEEEEECCCCHHHHHHHHHCCCCEEEECCHHHHHHHHHHHHHHHHCCCCEEEEECCCHHHHHH-CCCCCCEEEEE
T ss_conf             65457778983368706889776207827874365789999999999872423557540367022232-07641203122


Q ss_pred             C-HHHHHCCHHHHHHHHHHCCCCCCCEEEEEEC
Q ss_conf             1-3431000288898887448888974999981
Q gi|254780405|r  125 D-PPYGQGLAQQALAIIDKEGWLEPNALVIIEE  156 (189)
Q Consensus       125 D-PPY~~~~~~~~l~~l~~~~~L~~~gliiiE~  156 (189)
T Consensus       197 ~GVLYHRkSPLe~L~~L~~--~L~~~GELVL~T  227 (316)
T TIGR00452       197 LGVLYHRKSPLEHLKQLKD--QLVKKGELVLET  227 (316)
T ss_pred             CCHHHCCCCCHHHHHHHHH--HHHHCCCEEEEE
T ss_conf             0202115570899999999--987579358653