Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 125, Issue 44, Pages 9609-9618Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.1c06440
Keywords
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Funding
- KAKENHI of JSPS [JP18H01938, JP19H05527, JP19K23624, JP20H00372]
- World Research Hub Initiatives in Tokyo Institute of Technology
- Cooperative Research Program of the Network Joint Research Center for Materials and Devices'' from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- RIKEN Pioneering Project, Fundamental Principles Underlying the Hierarchy of Matter: a Comprehensive Experimental Study''
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The conformation of the K+ - peptide complex shows significant variation with temperature, indicating greater flexibility and lower barrier heights when complexed with K+ compared to other metal-peptide complexes. The variability of the conformational distribution with temperature for the ions follows the same order of ion permeability of a K+ channel. This study highlights the power of using an additional temperature-controlled ion trap to explore the conformational landscape of flexible molecular systems.
Potassium ion channels selectively permeate K+, as well as Rb+ and Cs+ to some degree, while excluding Na+ and Li+. Conformations of alkali metal complexes of Ac-Tyr-NHMe, a model peptide of the selectivity filter in a K+ channel, were previously found to correlate with the permeability of alkali metal ions to a K+ channel by cold ion trap infrared spectroscopy. With an additional temperature-controlled ion trap, we examined the conformations of the alkali metal complexes, allowing the ions to collide with a He buffer gas at different temperatures, prior to spectroscopic investigation. The conformational distribution of the K+ - peptide complex shows the most significant variation with temperature, which suggests that this complex has more flexibility when complexed with K+ and suggests lower barrier heights than other metal-peptide complexes. The variability of the conformational distribution with temperature for the ions follows the same order of ion permeability of a K+ channel. This work demonstrates that the additional temperature-controlled ion trap is a powerful tool to explore the conformational landscape of flexible molecular systems.
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