Alanine mutagenesis of high-mobility-group-protein-1 box B (HMG1-B)

被引：12

作者：

Taudte, S ^{[1
]}

Xin, H ^{[1
]}

Kallenbach, NR ^{[1
]}

机构：

[1] NYU, Dept Chem, New York, NY 10003 USA

来源：

BIOCHEMICAL JOURNAL | 2000年 / 347卷 / pt 3期

关键词：

alanine scan; four-way junction; protein-DNA interaction; protein stability; structure-specific recognition;

D O I：

10.1042/0264-6021:3470807

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

We have generated a set of alanine-scanning substitutions in high-mobility-group protein 1 box B (HMG1-B; the second domain of the HMG1 nuclear protein from the rat) in order to explore the influence of specific surface side chains on its function and folding. Guanidine hydrochloride and thermal unfolding studies have been carried out to investigate the effect of substituted residues on the folding pathway. Binding to four-way junction and linear-duplex DNA has been assayed to determine which residues play an important role in DNA binding. We have identified several mutants that are more stable or bind more tightly to the junction than the wild-type, including the particular phenylalanine side chain that is thought to intercalate into the DNA. Thus the interaction between HMG1-B and branched DNA substrates should exhibit differences from present models based on the structure of the complexes that have been solved to date.

引用

页码：807 / 814

页数：8

共 37 条

[1] Solution structure of the HMG protein NHP6A and its interaction with DNA reveals the structural determinants for non-sequence-specific binding [J].