PMID: 25731590Mar 4, 2015Paper

Comparison of the Structure and Biological Activities of Wild-type and Mutant Liver-targeting Peptide Modified Recombinant Human Endostatin (rES-CSP) in Human Hepatocellular Carcinoma HepG2 Cells

Protein and Peptide Letters
Dongmei BaoJiayong Zhu

Abstract

A missense mutation of Aspartic to Asparagine acid in 113 position of liver-targeting peptide CSP I-plus modified rEndostatin (rES-CSP) happened unexpectedly results in the changes of protein secondary structure and a reduced bioactivity. With the aim to clarify the structure-function relationships featuring the fuse protein rES-CSP, the three-dimensional structural models of wild-type and mutant D113NrES-CSP were constructed by template-based modeling approach. To evaluate the effect of the single mutation on rES-CSP stability, the molecular dynamic simulation was used to reveal the structural and dynamic characteristics. Analysis on the bioactivity were conducted using a number of validated in vitro assays including proliferation, migration, cell cycle and apoptosis in HepG2 cells. Results showed that the mutant rES-CSP reduce the stability and loss of function, and the wild-type rES-CSP could both bind to the normal liver cells Chang's and the hepatoma cells HepG2 but significantly higher than non-targeted rEndostatin. rESCSP could inhibit the proliferation of hepatoma cells in a dose-dependent manner, and increase the proportion of G1 phase, reduce the proportion of S phase, promote the apoptosis on hepatoma cells. These re...Continue Reading

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