title: Hydrolytic cleavage of pyroglutamyl-peptide bond. III. A highly selective cleavage in 70% methanesulfonic acid.
abstract: A method for highly selective cleavage of pGlu-peptide linkages in 70% methanesulfonic acid (MSA) is described. When pGlu-Ala-Phe-OH, pGlu-His-Pro-Oh and dog neuromedin U-8 (d-NMU-8) (1--7)-OH (pGlu-Phe-Leu-Phe-Arg-OH) were hydrolyzed in 70% MSA at 60 degrees C for 3 h or at 25 degrees C for 3 d, the pGlu-peptide linkage was predominantly cleaved to give H-Ala-OH, H-His-Pro-OH and H-Phe-Leu-Phe-Arg-Pro-Arg-OH, in high yields. The results indicated that pGlu-peptide linkages are highly susceptible to 70% MSA, whereas the amide bond of the pyrrolidone moiety of the pGlu residue and other internal peptide bonds are extremely resistant.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokuriku University, Kanazawa, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hashimoto
authors.forename: K
authors.initials: K
authors.lastname: Ohki
authors.forename: N
authors.initials: N
authors.lastname: Sakura
mesh_terms: D000818:Animals; D004285:Dogs; D006868:Hydrolysis; D007202:Indicators and Reagents; D008698:Mesylates / Q000737:chemistry*; D009479:Neuropeptides / Q000737:chemistry; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification; D011761:Pyrrolidonecarboxylic Acid / Q000737:chemistry*
chemical_list: D007202:Indicators and Reagents; D008698:Mesylates; D009479:Neuropeptides; D010455:Peptides; C046270:neuromedin U 8; D011761:Pyrrolidonecarboxylic Acid