globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1911181116
论文题名:
How internal cavities destabilize a protein
作者: Xue M.; Wakamoto T.; Kejlberg C.; Yoshimura Y.; Nielsen T.A.; Risør M.W.; Sanggaard K.W.; Kitahara R.; Mulder F.A.A.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期:42
起始页码: 21031
结束页码: 21036
语种: 英语
英文关键词: High-pressure NMR ; Protein folding and cooperativity ; Protein stability ; Unfolded state
Scopus关键词: lysozyme ; protein ; Article ; controlled study ; nuclear magnetic resonance spectroscopy ; priority journal ; protein domain ; protein folding ; protein stability ; protein unfolding ; chemistry ; Enterobacteria phage T4 ; nuclear magnetic resonance ; pressure ; procedures ; protein conformation ; protein denaturation ; Bacteriophage T4 ; Muramidase ; Nuclear Magnetic Resonance, Biomolecular ; Pressure ; Protein Conformation ; Protein Denaturation ; Protein Folding ; Proteins
英文摘要: Although many proteins possess a distinct folded structure lying at a minimum in a funneled free energy landscape, thermal energy causes any protein to continuously access lowly populated excited states. The existence of excited states is an integral part of biological function. Although transitions into the excited states may lead to protein misfolding and aggregation, little structural information is currently available for them. Here, we show how NMR spectroscopy, coupled with pressure perturbation, brings these elusive species to light. As pressure acts to favor states with lower partial molar volume, NMR follows the ensuing change in the equilibrium spectroscopically, with residue-specific resolution. For T4 lysozyme L99A, relaxation dispersion NMR was used to follow the increase in population of a previously identified “invisible” folded state with pressure, as this is driven by the reduction in cavity volume by the flipping-in of a surface aromatic group. Furthermore, multiple partly disordered excited states were detected at equilibrium using pressure-dependent H/D exchange NMR spectroscopy. Here, unfolding reduced partial molar volume by the removal of empty internal cavities and packing imperfections through subglobal and global unfolding. A close correspondence was found for the distinct pressure sensitivities of various parts of the protein and the amount of internal cavity volume that was lost in each unfolding event. The free energies and populations of excited states allowed us to determine the energetic penalty of empty internal protein cavities to be 36 cal·Å−3 © 2019 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163524
Appears in Collections:气候变化与战略

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作者单位: Xue, M., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Washington, Seattle, WA 98195, United States; Wakamoto, T., Graduate School of Life Sciences, Ritsumeikan University, Shiga, 525-8577, Japan; Kejlberg, C., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Aarhus, Aarhus C, 8000, Denmark; Yoshimura, Y., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Aarhus, Aarhus C, 8000, Denmark, Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima City, Hiroshima, 739-8526, Japan; Nielsen, T.A., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Aarhus, Aarhus C, 8000, Denmark; Risør, M.W., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Molecular Biology and Genetics, University of Aarhus, Aarhus C, 8000, Denmark; Sanggaard, K.W., Department of Molecular Biology and Genetics, University of Aarhus, Aarhus C, 8000, Denmark, Application Science and Technology, Arla Foods Ingredients Group P/S, Viby J, 8260, Denmark; Kitahara, R., Graduate School of Life Sciences, Ritsumeikan University, Shiga, 525-8577, Japan, College of Pharmaceutical Sciences, Ritsumeikan University, Shiga, 525-8577, Japan; Mulder, F.A.A., Interdisciplinary Nanoscience Center, University of Aarhus, Aarhus C, 8000, Denmark, Department of Chemistry, University of Aarhus, Aarhus C, 8000, Denmark

Recommended Citation:
Xue M.,Wakamoto T.,Kejlberg C.,et al. How internal cavities destabilize a protein[J]. Proceedings of the National Academy of Sciences of the United States of America,2019-01-01,116(42)
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