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Protein titration in the crystal state.

Abstract：

:Proteins are complex structures whose overall stability critically depends on a delicate balance of numerous interactions of similar strength, which are markedly influenced by their environment. Here, we present an analysis of the effect of pH on a protein structure in the crystalline state using RNase A as a model system. By altering only one physico-chemical parameter in a controlled manner, we are able to quantify the structural changes induced in the protein. Atomic resolution X-ray diffraction data were collected for crystals at six pH* values ranging from 5.2 to 8.8, and the six independently refined structures reveal subtle, albeit well-defined variations directly related to the pH titration of the protein. The deprotonation of the catalytic His12 residue is clearly evident in the electron density maps, confirming the reaction mechanism proposed by earlier enzymatic and structural studies. The concerted structural changes observed in the regions remote from the active-site point to an adaptation of the protein structure to the changes in the physico-chemical environment. Analysis of the stereochemistry of the six structures provided accurate estimates of p Kavalues of most of the histidine residues. This study gives further evidence for the advantage of atomic resolution X-ray crystallographic analyses for revealing small but significant structural changes which provide clues to the function of a biological macromolecule.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Berisio R,Lamzin VS,Sica F,Wilson KS,Zagari A,Mazzarella L

doi

10.1006/jmbi.1999.3093

keywords:

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

845-54

issue

4

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(99)93093-0

journal_volume

292

pub_type

杂志文章

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