ECOD: An Evolutionary Classification of Protein Domains
Figure 12
SAM MTases and Rossmann domains.
(A) SAM MTases as represented by ribosomal protein L11 methyltransferase complexed with SAM (PDB 2nxe). (B) Rossmann domains as represented by formaldehyde dehydrogenase complexed with NAD (PDB 1kol). In (A) and (B), helices are colored in cyan, strands in yellow, and loops in white. The additional strand 7 in SAM-MTase is colored in orange. The respective cofactor, SAM or NAD, is shown in sticks. The Gly-rich loop beneath the cofactor is colored in magenta. The conserved Asp or Glu that forms hydrogen bonds with the adenosine ribose hydroxyls is shown in sticks. Diagrams are made by Pymol (The PyMOL Molecular Graphics System, Schrödinger, LLC. http://www.pymol.org/). (C) Manually modified DALI [22] alignment between the two domains shown in (A) and (B). Starting and ending residue numbers are labeled before and after the alignment. β-strands and α-helices are labeled numerically and shown in arrows and cylinders respectively above the sequence alignment. The Gly-rich loop is highlighted in magenta, and the conserved Asp or Glu is highlighted in red.