Monitoring the Kinetics of Ion-Dependent Protein Folding by Time-Resolved NMR Spectroscopy at Atomic Resolution
摘要:
The kinetics of protein refolding have been monitored by time-resolved NMR spectroscopy. It is shown that refolding of metal binding proteins can be induced by photolysis of photo labile ion chelators, the subsequent release of Ca2+ ions can induce protein folding, and the changes in resonance positions can be monitored by time-resolved NMR spectroscopy. The feasibility of the approach is demonstrated by characterizing the refolding of alpha-lactalbumin, or protein containing a Ca2+ binding site, unfolded in 4 M urea at pH 7 in the absence of Ca2+. The refolding kinetics of the methyl groups of residues Leu15 and Val21 in the core of the protein have been determined to be mono-exponential with rates of 0.28 s(-1) and 0.23 s(-1), respectively at 300 K.
A new class of photolabile chelators for the rapid release of divalent cations: generation of caged calcium and caged magnesium
作者:G. C. R. Ellis-Davies、J. H. Kaplan
DOI:10.1021/jo00244a022
日期:1988.4
US4981985A
申请人:——
公开号:US4981985A
公开(公告)日:1991-01-01
Monitoring the Kinetics of Ion-Dependent Protein Folding by Time-Resolved NMR Spectroscopy at Atomic Resolution
作者:Till Kühn、Harald Schwalbe
DOI:10.1021/ja994212b
日期:2000.7.1
The kinetics of protein refolding have been monitored by time-resolved NMR spectroscopy. It is shown that refolding of metal binding proteins can be induced by photolysis of photo labile ion chelators, the subsequent release of Ca2+ ions can induce protein folding, and the changes in resonance positions can be monitored by time-resolved NMR spectroscopy. The feasibility of the approach is demonstrated by characterizing the refolding of alpha-lactalbumin, or protein containing a Ca2+ binding site, unfolded in 4 M urea at pH 7 in the absence of Ca2+. The refolding kinetics of the methyl groups of residues Leu15 and Val21 in the core of the protein have been determined to be mono-exponential with rates of 0.28 s(-1) and 0.23 s(-1), respectively at 300 K.