Structural highlights
FunctionQ6J5N4_ECOLX Important for reducing fluoride concentration in the cell, thus reducing its toxicity.[HAMAP-Rule:MF_00454][SAAS:SAAS00096000] Publication Abstract from PubMedFluoride ion channels of the Fluc family selectively export F(-) ions to rescue unicellular organisms from acute F(-) toxicity. Crystal structures of bacterial Fluc channels in complex with synthetic monobodies, fibronectin-derived soluble beta-sandwich fold proteins, show 2-fold symmetric homodimers with an antiparallel transmembrane topology. Monobodies also block Fluc F(-) current via a pore blocking mechanism. However, little is known about the energetic contributions of individual monobody residues to the affinity of the monobody-channel complex or whether the structural paratope corresponds to functional reality. This study seeks to structurally identify and compare residues interacting with Fluc between two highly similar monobodies and subjects them to mutagenesis and functional measurements of equilibrium affinities via a fluorescence anisotropy binding assay to determine their energetic contributions. The results indicate that the functional and structural paratopes strongly agree and that many Tyr residues at the interface, while playing a key role in affinity, can be substituted with Phe and Trp without large disruptions. Molecular Interactions between a Fluoride Ion Channel and Synthetic Protein Blockers.,Turman DL, Cheloff AZ, Corrado AD, Nathanson JT, Miller C Biochemistry. 2018 Feb 2. doi: 10.1021/acs.biochem.7b01272. PMID:29393634[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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