Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.238102
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Funding
- National Natural Science Foundation of China [11574339, 11404361, 11290164, 11290165, 61422509]
- National Basic Research Program of China [2014CB339800]
- Key Research Program of the Chinese Academy of Sciences [KJZD-EW-M03]
- Deepcomp7000 of Supercomputing Center, Computer Network Information Center of Chinese Academy of Sciences
- ScGrid of Supercomputing Center, Computer Network Information Center of Chinese Academy of Sciences
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase)
- Shanghai Supercomputer Center of China
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We experimentally observed considerable solubility of tryptophan (Trp) in a CuCl2 aqueous solution, which could reach 2-5 times the solubility of Trp in pure water. Theoretical studies show that the strong cation-p interaction between Cu2+ and the aromatic ring in Trp modifies the electronic distribution of the aromatic ring to enhance significantly the water affinity of Trp. Similar solubility enhancement has also been observed for other divalent transition-metal cations (e.g., Zn2+ and Ni2+), another aromatic amino acid (phenylalanine), and three aromatic peptides (Trp-Phe, Phe-Phe, and Trp-Ala-Phe).
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