Evaluating electrostatic contributions to binding with the use of protein charge ladders

被引:84
作者
Gao, JM [1 ]
Mammen, M [1 ]
Whitesides, GM [1 ]
机构
[1] HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138
关键词
D O I
10.1126/science.272.5261.535
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Electrostatic interactions between charges on ligands and charges on proteins that are remote from the binding interface can influence the free energy of binding (Delta G(b)). The binding affinities between charged ligands and the members of a charge ladder of bovine carbonic anhydrase (CAII) constructed by random acetylation of the amino groups on its surface were measured by affinity capillary electrophoresis (ACE). The values of Delta G(b) derived from this analysis correlated approximately linearly with the charge. Opposite charges on the ligand and the members of the charge ladder of CAII were stabilizing; like charges were destabilizing. The combination of ACE and protein charge ladders provides a tool for quantitatively examining the contributions of electrostatics to free energies of molecular recognition in biology.
引用
收藏
页码:535 / 537
页数:3
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