Protein
Diphthine methyl ester synthase
Organism
Kluyveromyces lactis (strain ATCC 8585 / CBS 2359 / DSM 70799 / NBRC 1267 / NRRL Y-1140 / WM37)
Function
S-adenosyl-L-methionine-dependent methyltransferase that catalyzes four methylations of the modified target histidine residue in translation elongation factor 2 (EF-2), to form an intermediate called diphthine methyl ester. The four successive methylation reactions represent the second step of diphthamide biosynthesis.
Similarity
Belongs to the diphthine synthase family.
Sequence
MLYFIGLGLSYETDITVRGLNAIKQCSRVYLEHYTSILMTASLEELEEFYGKKVTLADRELVESGAEELLRDADKEDVAFLVVGDVFGATTHTDLVLRAKQRNIPVEVIHNASVMNAVGSCGLQLYNFGQTISMVFFTDSWRPDSWYDKIWENRKIGLHTLVLLDIKVKEQSIENMARGRLIYEPPRYMSIAQCCEQLLEIEETRGTEAYTPDTPCVAISRLGSASQTFKAGTIKELAEYDSGEPLHSLVILGRQTHELEIEYLLEFCDDREKFKQDVASDQEYFKPPAWVPPPEDED