High-resolution structure of a fish aquaporin reveals a novel extracellular fold
| Autor: | Jiao Zeng, Florian Schmitz, Simon Isaksson, Jessica Glas, Olivia Arbab, Martin Andersson, Kristina Sundell, Leif A Eriksson, Kunchithapadam Swaminathan, Susanna Törnroth-Horsefield, Kristina Hedfalk |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Life science alliance 5(12), e202201491-(2022). doi:10.26508/lsa.202201491 |
| ISSN: | 2575-1077 |
| Popis: | Life science alliance 5(12), e202201491 - (2022). doi:10.26508/lsa.202201491 Aquaporins are protein channels embedded in the lipid bilayer in cells from all organisms on earth that are crucial for water homeostasis. In fish, aquaporins are believed to be important for osmoregulation; however, the molecular mechanism behind this is poorly understood. Here, we present the first structural and functional characterization of a fish aquaporin; cpAQP1aa from the fresh water fish climbing perch (Anabas testudineus), a species that is of high osmoregulatory interest because of its ability to spend time in seawater and on land. These studies show that cpAQP1aa is a water-specific aquaporin with a unique fold on the extracellular side that results in a constriction region. Functional analysis combined with molecular dynamic simulations suggests that phosphorylation at two sites causes structural perturbations in this region that may have implications for channel gating from the extracellular side. Published by EMBO Press, Heidelberg |
| Databáze: | OpenAIRE |
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