Alternatively packed dry molten globule-like intermediate in the native state ensemble of a multidomain protein
| Title | Alternatively packed dry molten globule-like intermediate in the native state ensemble of a multidomain protein |
| Publication Type | Journal Article |
| Year of Publication | 2017 |
| Authors | Mishra, P, Jha, SKumar |
| Journal | Journal of Physical Chemistry B |
| Volume | 121 |
| Issue | 40 |
| Pagination | 9336-9347 |
| Date Published | OCT |
| Type of Article | Article |
| Abstract | It has been difficult to quantify the degree of side-chain conformational heterogeneity in the native (N) state ensemble of proteins and the relative energetic contributions of the side-chain packing and the hydrophobic effect in protein stability. Here, we show using multiple site specific spectroscopic probes and tools of thermodynamics that the N state ensemble of a multidomain protein contains an equilibrium intermediate (I) whose interdomain region resembles a dry molten globule. In the I state, a tryptophan residue in the interdomain region is alternatively packed, but its secondary structure and intradomain packing are N-like. The I state also has a larger interdomain distance, but the domain-domain interface is dry and molten. Our results indicate that hydrophobic desolvation and side-chain packing are decoupled during protein folding and that interdomain packing interactions have an important energetic contribution in protein stability. Dynamic interconversion between alternatively packed N-like states could be important for multiple allosteric and ligand binding functions of this protein. |
| DOI | 10.1021/acs.jpcb.7b07032 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 3.177 |
Divison category:
Physical and Materials Chemistry