期刊
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
卷 395, 期 2, 页码 215-224出版社
ACADEMIC PRESS INC
DOI: 10.1006/abbi.2001.2554
关键词
fatty acid-binding protein; protein folding; protein engineering; near-UV CD; far-UV CD; circular dichroism; tryptophan; second-derivative spectroscopy; UV absorption
An UV absorption and CD study of intestinal fatty acid-binding protein is presented. Since there are only two Trp residues in the molecule, two single-Trp mutants were prepared to deconvolute their signals. The individual contribution of the eight Phe and four Tyr residues was not established; however, Phe global contribution is relatively free of interferences from the other chromophores and was observed directly. CD spectra showed that Phe vibronic structure was unusually sharp and seems to monitor very specific details in the three-dimensional structure. The global signal from Tyr was assigned only approximately due to band broadening and overlapping. At the upper end of the CD spectrum, strong positive L-1(b) Trp transitions from Trp 82 and strong negative L-1(b) Trp transitions from Trp 6 were observed. L-1(a) transitions were overall weak, positive for Trp 82 and negative for Trp 6, nearly canceling each other out in the final spectrum. The above assignment is of practical and fundamental interest to monitor folding, binding, and molecular dynamics down to microdomain resolution. The assignment of Trp bands allowed comparison with previous data from CRABP1, another member of the IFABP family with 28% identical residues. It was found that structural homology extends beyond sequence and tertiary fold to include optical properties of equivalent Trp residues in the structure. (C) 2001 Academic Press.
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