Crystal structure of a dimeric chymotrypsin inhibitor 2 mutant containing an inserted glutamine repeat.Chen, Y.W., Stott, K., Perutz, M.F.
(1999) Proc.Natl.Acad.Sci.USA 96: 1257-1261
- PubMed: 9990011
- PubMed Abstract:
- Towards the Complete Structural Characterization of a Protein Folding Pathway: The Structures of the Denatured, Transition and Native States for the Association/Folding of Two Complementary Fragments of Cleaved Chymotrypsin Inhibitor 2. Direction Evidence for a Nucleation-Condensation Mechanism
Neira, J.L.,Davis, B.,Ladurner, A.G.,Buckle, A.M.,De Prat Gay, G.,Fersht, A.R.
(1996) Fold.Des. 1: 189
- Crystal and Molecular Structure of the Serine Proteinase Inhibitor Ci-2 from Barley Seeds
Mcphalen, C.A.,James, M.N.G.
(1987) Biochemistry 26: 261
- The Determination of the Three-Dimensional Structure of Barley Serine Proteinase Inhibitor 2 by Nuclear Magnetic Resonance, Distance Geometry and Restrained Molecular Dynamics
Clore, G.M.,Gronenborn, A.M.,Kjaer, M.,Poulsen, F.M.
(1987) Protein Eng. 1: 305
- Glutamine, Alanine or Glycine Repeats Inserted Into the Loop of a Protein Have Minimal Effects on Stability and Folding Rates
Ladurner, A.G.,Fersht, A.R.
(1997) J.Mol.Biol. 273: 330
- Incorporation of Glutamine Repeats Makes Protein Oligomerize: Implications for Neurodegenerative Diseases
Stott, K.,Blackburn, J.M.,Butler, P.J.G.,Perutz, M.
(1995) Proc.Natl.Acad.Sci.USA 92: 6509
We have constructed mutants of chymotrypsin inhibitor 2 with short glutamine repeats inserted into its inhibitory loop. These mutants oligomerize when expressed in Escherichia coli. The dimer of a mutant with four glutamines now has been crystallized ...
We have constructed mutants of chymotrypsin inhibitor 2 with short glutamine repeats inserted into its inhibitory loop. These mutants oligomerize when expressed in Escherichia coli. The dimer of a mutant with four glutamines now has been crystallized, and its structure has been solved by molecular replacement by using the wild-type monomer as a search model. The structure of each half of the dimer is found to be the same as that of the wild-type monomer, except around the glutamine insertion. It was proposed that the components of the oligomers are held together by hydrogen bonds between the main-chain and side-chain amides of the glutamine repeats. Instead, they appear to form by swapping domains on folding in E. coli, and the glutamine repeats connecting the components of the dimers are disordered.
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