<p>This ATP-grasp domain is found in the ribosomal S6 modification enzyme RimK [<cite idref="PUB00020972"/>]. It has an unusual nucleotide-binding fold referred to as palmate, or ATP-grasp fold. This domain is found in a number of enzymes of known structure as well as in urea amidolyase, tubulin-tyrosine ligase, and three enzymes of purine biosynthesis.</p>