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pK values of histidine residues in ribonuclease Sa: effect of salt and net charge.

Abstract：

:The primary goal of this study was to gain a better understanding of the effect of environment and ionic strength on the pK values of histidine residues in proteins. The salt-dependence of pK values for two histidine residues in ribonuclease Sa (RNase Sa) (pI=3.5) and a variant in which five acidic amino acids have been changed to lysine (5K) (pI=10.2) was measured and compared to pK values of model histidine-containing peptides. The pK of His53 is elevated by two pH units (pK=8.61) in RNase Sa and by nearly one pH unit (pK=7.39) in 5K at low salt relative to the pK of histidine in the model peptides (pK=6.6). The pK for His53 remains elevated in 1.5M NaCl (pK=7.89). The elevated pK for His53 is a result of screenable electrostatic interactions, particularly with Glu74, and a non-screenable hydrogen bond interaction with water. The pK of His85 in RNase Sa and 5K is slightly below the model pK at low salt and merges with this value at 1.5M NaCl. The pK of His85 reflects mainly effects of long-range Coulombic interactions that are screenable by salt. The tautomeric states of the neutral histidine residues are changed by charge reversal. The histidine pK values in RNase Sa are always higher than the pK values in the 5K variant. These results emphasize that the net charge of the protein influences the pK values of the histidine residues. Structure-based pK calculations capture the salt-dependence relatively well but are unable to predict absolute histidine pK values.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Huyghues-Despointes BM,Thurlkill RL,Daily MD,Schell D,Briggs JM,Antosiewicz JM,Pace CN,Scholtz JM

doi

10.1016/s0022-2836(02)01274-3

keywords:

subject

Has Abstract

pub_date

2003-01-31 00:00:00

pages

1093-105

issue

5

eissn

0022-2836

issn

1089-8638

pii

S0022283602012743

journal_volume

325

pub_type

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