Study on the Assembly Mechanisms and Transport Properties of Transmembrane End-Charged Cyclic Peptide Nanotubes
In this work, two end-charged cyclic peptide nanotubes (CPNTs) embedded in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE) were designed to simulate transmembrane ion channels. Density functional theory (DFT) computations at the level of M06-2X/6-31G give different assembling modes of t...
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Published in | Journal of chemical information and modeling Vol. 61; no. 6; pp. 2754 - 2765 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Washington
American Chemical Society
28.06.2021
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Subjects | |
Online Access | Get full text |
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Summary: | In this work, two end-charged cyclic peptide nanotubes (CPNTs) embedded in 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine (POPE) were designed to simulate transmembrane ion channels. Density functional theory (DFT) computations at the level of M06-2X/6-31G give different assembling modes of the negatively charged ELWL–CPNT and positively charged RLWL–CPNT as (L–L)(D–L)(D–D)(L–L)(D–D)(L–L)(D–D) and (D–D)(L–L)(D–D)(L–L)(D–D)(L–L)(D–D), respectively. Molecular dynamics (MD) simulations indicate that a charge at a CPNT end obviously affects the structure of the channel water chain and the diffusion behavior of K+. The regions with the highest probability of H-bond defects in the channel water chains are gap5 and gap2 in ELWL/POPE–CPNT and RLWL/POPE–CPNT, respectively. K+ can easily enter either CPNT by desolvation, and behaves more actively in RLWL/POPE–CPNT, shuttling rapidly and frequently between an α-plane zone and an adjacent midplane region. Results of this work reveal that a charge at the end of an ionic channel may significantly alter the transport characteristics of the channel. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1549-9596 1549-960X |
DOI: | 10.1021/acs.jcim.1c00194 |