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NMR structure determination of proteins supplemented by quantum chemical calculations: detailed structure of the Ca2+ sites in the EGF34 fragment of protein S.

Abstract：

:We present and test two methods to use quantum chemical calculations to improve standard protein structure refinement by molecular dynamics simulations restrained to experimental NMR data. In the first, we replace the molecular mechanics force field (employed in standard refinement to supplement experimental data) for a site of interest by quantum chemical calculations. This way, we obtain an accurate description of the site, even if a molecular-mechanics force field does not exist for this site, or if there is little experimental information about the site. Moreover, the site may change its bonding during the refinement, which often is the case for metal sites. The second method is to extract a molecular mechanics potential for the site of interest from a quantum chemical geometry optimisation and frequency calculation. We apply both methods to the two Ca2+ sites in the epidermal growth factor-like domains 3 and 4 in the vitamin K-dependent protein S and compare them to various methods to treat these sites in standard refinement. We show that both methods perform well and have their advantages and disadvantages. We also show that the glutamate Ca2+ ligand is unlikely to bind in a bidentate mode, in contrast to the crystal structure of an EGF domain of factor IX.

journal_name

J Biomol NMR

journal_title

Journal of biomolecular NMR

authors

Hsiao YW,Drakenberg T,Ryde U

doi

10.1007/s10858-004-6729-7

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

97-114

issue

2

eissn

0925-2738

issn

1573-5001

journal_volume

31

pub_type

杂志文章

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