4PPM:
reference: Crystal structure of the catalytic domain of PigE: a transaminase involved in the biosynthesis of 2-methyl-3-n-amyl-pyrrole (MAP) from Serratia sp. FS14., Lou X, Ran T, Han N, Gao Y, He J, Tang L, Xu D, Wang W, Biochem Biophys Res Commun. 2014 Apr 25;447(1):178-83. doi:, 10.1016/j.bbrc.2014.03.125. Epub 2014 Apr 2. PMID: 24704447

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