This entry corresponds to the N-terminal alpha helical domain of the HemK protein. HemK is a methyltransferase enzyme that carries out the methylation of the N5 nitrogen of the glutamine found in the conserved GGQ motif of class-1 release factors [3].

1: Structural characterization and comparative phylogenetic analysis of Escherichia coli HemK, a protein (N5)-glutamine methyltransferase. Yang Z, Shipman L, Zhang M, Anton BP, Roberts RJ, Cheng X; J Mol Biol. 2004;340:695-706. PMID:15223314

2: Molecular basis for bacterial class I release factor methylation by PrmC. Graille M, Heurgue-Hamard V, Champ S, Mora L, Scrima N, Ulryck N, van Tilbeurgh H, Buckingham RH; Mol Cell. 2005;20:917-927. PMID:16364916

3: Structures along the catalytic pathway of PrmC/HemK, an N5-glutamine AdoMet-dependent methyltransferase. Schubert HL, Phillips JD, Hill CP; Biochemistry. 2003;42:5592-5599. PMID:12741815

4: A novel mode of dimerization via formation of a glutamate anhydride crosslink in a protein crystal structure. Agarwal R, Burley SK, Swaminathan S; Proteins. 2008;71:1038-1041. PMID:18247349