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Long-Range Interactions Within a Nonnative Protein
Abstract
Protein folding and unfolding are coupled to a range of biological phenomena, from the regulation of cellular activity to the onset of neurodegenerative diseases. Defining the nature of the conformations sampled in nonnative proteins is crucial for understanding the origins of such phenomena. We have used a combination of nuclear magnetic resonance (NMR) spectroscopy and site-directed mutagenesis to study unfolded states of the protein lysozyme. Extensive clusters of hydrophobic structure exist within the wild-type protein even under strongly denaturing conditions. These clusters involve distinct regions of the sequence but are all disrupted by a single point mutation that replaced residue Trp 62 with Gly located at the interface of the two major structural domains in the native state. Thus, nativelike structure in the denatured protein is stabilized by the involvement of Trp 62 in nonnative and long-range interactions.
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“In addition, 3D HNCO and HNCA experiments were acquired for two 15N,13C double labeled AR AD (1-558) samples (25 μM and 100 μM) dissolved in NMR buffer.”
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Metadata
- Authors
- Klein-Seetharaman, J., Oikawa, M., Grimshaw, S. B., Wirmer, J., Duchardt, E., Ueda, T., Imoto, T., Smith, L. J., Dobson, C. M., & Schwalbe, H.
- Venue
- Science
- Published
- 2002-03
- Volume
- 295
- Issue
- 5560
- Pages
- 1719-1722
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1996518756
- Cited by
- 615
- References
- 0
- FWCI
- 18.36
- Type
- journal article
- Language
- en
- Open access
- closed
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