>TIGR00740 TIGR00740 methyltransferase, putative; InterPro: IPR005271 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 . The proteins of this family are restricted to the Proteobacteria, sharing consistent length, full-length homology, and on average better than 35 0dentity. It is reasonable to predict equivalent function within this subfamily. .

Probab=93.55  E-value=0.12  Score=30.47  Aligned_cols=81  Identities=19%  Similarity=0.306  Sum_probs=60.8

Q ss_pred             CCCCHHHHHHHHHHCCCCCCCEEEEECCCCCHHHHHHHHC--CCC-EEEEECCCCCCHHHHHHHHHHHHCC--CCCCHHH
Q ss_conf             1239899999999719899987999758988234677502--352-5998425543036887875322001--2200000
Q gi|254780398|r   29 FLLDLNILKKIAESSGSLDGITVIEIGAGPGNLTQMLLTL--GAR-KVIVIEKDQQFFPILKDISSQHPNR--LEIIQDD  103 (284)
Q Consensus        29 FL~d~~i~~~iv~~~~~~~~~~VlEIGpG~G~LT~~Ll~~--~~~-~v~aiEiD~~~~~~l~~~~~~~~~~--~~ii~~D  103 (284)
T Consensus        45 yfI~~nL~E~~~~ks--lp~~~vYDLGCS~G~~~l~~~R~I~~~~~~~igIDNS~pM~~~~~~~~~~y~~~~Pv~~~~~D  122 (247)
T TIGR00740        45 YFIGMNLAERFVPKS--LPKPLVYDLGCSTGAATLSLRRNIQQDNIKIIGIDNSMPMLERCREHIKAYKNAIPVEVLCMD  122 (247)
T ss_pred             HHHHHHHHHHHHHHC--CCCCCEEECCCCHHHHHHHHHHCCCCCCEEEEEECCCHHHHHHHHHHHHHHCCCCCEEEEHHH
T ss_conf             999877776543311--688741223343235776653046878537988418888999999999874247882320102


Q ss_pred             HCCCCHHH
Q ss_conf             00143155
Q gi|254780398|r  104 ALKVDFEK  111 (284)
Q Consensus       104 al~~d~~~  111 (284)
T Consensus       123 ~~~v~~~~  130 (247)
T TIGR00740       123 IREVEIKN  130 (247)
T ss_pred             HHHHHHHH
T ss_conf             45666655