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Comparison of the rates of deamidation, diketopiperazine formation, and oxidation in recombinant human vascular endothelial growth factor and model peptides

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The AAPS Journal : Volume 1

Comparison of the rates of deamidation, diketopiperazine formation, and oxidation in recombinant human vascular endothelial growth factor and model peptides

Content Provider	Springer Nature Link
Author	Goolcharran, Chimanlall Jones, Andrew J. S. Borchardt, Ronald T.
Copyright Year	2002
Abstract	In this work, we examine the way in which stability information obtained from studies on small model peptides correlates with similar information acquired from a protein. The rates of deamidation, oxidation, and diketopiperazine reactions in model peptide systems were compared to those of recombinant human vascular endothelial growth factor (rhVEGF). The N-terminal residues of rhVEGF, a potent mitogen in angiogenesis, are susceptible to the aforementioned reactions. The degradation of the peptides L-Ala-L-Pro-L-Met (APM) and Gly-L-Gsn-L-His-L-His (GQNHH), residues 1–3 and 8–12 of rh VEGF, respectively, and rhVEGF were examined at pH 5 and 8 at 37°C. Capillary electrophoresis and high-performance liquid chromatography (HPLC) stability-indicating assays were developed to monitor the degradation of the penta- and tripeptides, respectively. The degradation of rhVEGF was determined by tryptic mapping and quantified by RP-HPLC. The rates of degradation of both peptides and the protein followed apparent first-order kinetics and increased with increasing pH. The tripeptide APM underwent diketopiperazine formation (Ala-Prodiketopiperazine) and oxidation of the Met residue, whereas the pentapeptide GQNHH degraded via the deamidation pathway. The results indicate that the rates of deamidation and oxidation of the protein are comparable to those observed in the model peptides at both pH values. However, the rate of the diketo-piperazine reaction was slower in the protein than in the model peptide, which may be the result of differences in the cis-trans equilibrium of the X-Pro peptide bonds in the 2 molecules.
Starting Page	42
Ending Page	47
Page Count	6
File Format	PDF
ISSN	12341234
Journal	The AAPS Journal
Volume Number	2
Issue Number	1
e-ISSN	15221059
Language	English
Publisher	Springer New York
Publisher Date	2000-03-01
Publisher Institution	American Association of Pharmaceutical Scientists
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Pharmacology/Toxicology Biochemistry Biotechnology Pharmacy
Content Type	Text
Resource Type	Article

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