期刊
PROTEIN SCIENCE
卷 10, 期 9, 页码 1856-1868出版社
WILEY
DOI: 10.1110/ps.14301
关键词
through hydrogen-bond scalar coupling; HN chemical shift; C alpha RMSD; structure conservation; structure homology; hydrogen exchange
资金
- NCRR NIH HHS [RR02301, S10 RR002781, P41 RR002301] Funding Source: Medline
Hydrogen bonding in cold-shock protein A of Escherichia coli has been investigated using long-range HNCO spectroscopy. Nearly half of the amide protons involved in hydrogen bonds in solution show no measurable protection from exchange in water, cautioning against a direct correspondence between hydrogen bonding and hydrogen exchange protection. The N to O atom distance across a hydrogen bond, R-NO, is related to the size of the (3h)J(NC ') trans hydrogen bond coupling constant and the amide proton chemical shift. Both NMR parameters show poorer agreement with the 2.0-Angstrom resolution X-ray structure of the cold-shock protein studied by NMR than with a 1.2-Angstrom resolution X-ray structure of a homologous cold-shock protein from the thermophile B. caldolyticus. The influence of crystallographic resolution on comparisons of, hydrogen bond lengths was further investigated using a database of 33 X-ray structures of ribonuclease A. For highly similar structures, both hydrogen bond R-NO distance and C alpha coordinate root mean square deviations (RMSD) show systematic increases as the resolution of the X-ray structure used for comparison decreases. As structures diverge, the effects of coordinate errors on R-NO distance and C alpha coordinate root mean square deviations become progressively smaller. The results of this study are discussed with regard to the influence of data precision on establishing structure similarity relationships between proteins.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据