Abstract
REPORTS in the literature1 regarding the dodecapeptide, bacitracin A, indicate the presence in the molecule of the sequences phenylalanyl histidine (I) and phenylalanyl isoleucyl cysteine (II). Two related facts remain unexplained: (a) there is only one phenylalanine residue in the molecule; hence it is the same phenylalanyl which is present in (I) and (II); (b) on total hydrolysis of dinitrophenyl–bacitracin A, the dinitrophenyl derivative of the isoleucine residue in (II) can be isolated, though in poor yield1.
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