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Title: Organic Nanotube with Subnanometer, pH-Responsive Lumen

Journal Article · · Journal of the American Chemical Society
ORCiD logo [1];  [2];  [3];  [3];  [3]; ORCiD logo [2]; ORCiD logo [4]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Engineering
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  3. Northwestern Univ., Evanston, IL (United States). Dept. of Civel & Environmental Engineering and Mechanical Engineering
  4. Univ. of California, Berkeley, CA (United States). Depts. of Materials Science and Engineering & Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry

While many synthetic nanotubes with a hydrophobic lumen and fast molecular transport have been developed, decorating the interior of these channels with polar and/or responsive functional groups remains challenging. In transmembrane proteins like the aquaporin and M2 channels, the presence of histidine residues in a mostly hydrophobic channel has led to enhanced selectivity and pH-based activation. In this paper, we report the synthesis of Bzim-CP, a cyclic octapeptide that contains a benzimidazole functionality as a chemical and structural mimic of histidine. Bzim-CP undergoes different protonation states, forms subnanometer nanotubes, and projects two different ionizable functionalities into the lumen. Present studies open up synthetic possibilities to functionalize subnanometer porous channels as a basis toward understanding new transport phenomena.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR)
Grant/Contract Number:
AC02-05CH11231; SC0001015; N00014-13-1-0760; CBET-1234305
OSTI ID:
1634048
Journal Information:
Journal of the American Chemical Society, Vol. 141, Issue 28; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)