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Relaxation of backbone bond geometry improves protein energy landscape modeling
Open accessAbstract
A key issue in macromolecular structure modeling is the granularity of the molecular representation. A fine‐grained representation can approximate the actual structure more accurately, but may require many more degrees of freedom than a coarse‐grained representation and hence make conformational search more challenging. We investigate this tradeoff between the accuracy and the size of protein conformational search space for two frequently used representations: one with fixed bond angles and lengths and one that has full flexibility. We performed large‐scale explorations of the energy landscapes of 82 protein domains under each model, and find that the introduction of bond angle flexibility significantly increases the average energy gap between native and non‐native structures. We also find that incorporating bonded geometry flexibility improves low resolution X‐ray crystallographic refinement. These results suggest that backbone bond angle relaxation makes an important contribution to native structure energetics, that current energy functions are sufficiently accurate to capture the energetic gain associated with subtle deformations from chain ideality, and more speculatively, that backbone geometry distortions occur late in protein folding to optimize packing in the native state.
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Metadata
- Authors
- Conway, P., Tyka, M. D., DiMaio, F., Konerding, D. E., & Baker, D.
- Venue
- Protein Science
- Publisher
- Wiley
- Published
- 2013-11-22
- Volume
- 23
- Issue
- 1
- Pages
- 47-55
- ISSN
- 0961-8368 (ISSN-L)
- 1469-896X
- OpenAlex
- W1724277458
- Cited by
- 407
- References
- 1
- FWCI
- 4.03
- Type
- journal article
- Language
- en
- Open access
- bronze
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