Role of the connectivity of secondary structure segments in the folding of α₁-antitrypsin

Title
Role of the connectivity of secondary structure segments in the folding of α₁-antitrypsin
Authors
이철주서은주유명희
Keywords
serpin; protein folding; metastable state; kinetic trap; circular permutant; α₁-antitrypsin
Issue Date
2001-09
Publisher
Biochemical and biophysical research communications
Citation
VOL 287, 636-641
Abstract
The native form of serpins (serine protease inhibitors) is metastable, which is critical to their biological functions. Spontaneous conversion from the native form of serpins into a more stable conformation, called the “latent” form, is restricted. To examine whether the connectivity of strand 1 of b-sheet C to the hydrophobic core is critical to the serpin’s preferential folding to the metastable native conformation, we designed a circularly-permuted mutant of a1-antitrypsin, the prototype serpin, in which strand 1C is disconnected from the hydrophobic core. Conformation of the circular permutant was similar to that of the latent form, as revealed by equilibrium unfolding, limited proteolysis, and spectroscopic properties. Our results support the notion that rapid folding of the hydrophobic core with concomitant incorporation of strand 1C into b-sheet C traps the serpin molecule into its native metastable conformation.
URI
http://pubs.kist.re.kr/handle/201004/9128
ISSN
1090-2104
Appears in Collections:
KIST Publication > Article
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