Structure of full-length human TRPM4

Transient receptor potential melastatin subfamily member 4 (TRPM4) is a widely distributed, calcium-activated, monovalent-selective cation channel. Mutations in human TRPM4 (hTRPM4) result in progressive familial heart block. Here, we report the electron cryomicroscopy structure of hTRPM4 in a close...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 115; no. 10; pp. 2377 - 2382
Main Authors Duan, Jingjing, Li, Zongli, Li, Jian, Santa-Cruz, Ana, Sanchez-Martinez, Silvia, Zhang, Jin, Clapham, David E.
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 06.03.2018
Subjects
Binding sites
Biological Sciences
Calcium
Cations
Channel gating
Coils
Conduction
Genes
Glycosylation
Ions
Lipids
Mutation
Sodium
Transient receptor potential proteins
cryomicroscopy
cardiac arrhythmia
ion channel
transient receptor potential channel
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Summary:Transient receptor potential melastatin subfamily member 4 (TRPM4) is a widely distributed, calcium-activated, monovalent-selective cation channel. Mutations in human TRPM4 (hTRPM4) result in progressive familial heart block. Here, we report the electron cryomicroscopy structure of hTRPM4 in a closed, Na⁺-bound, apo state at pH 7.5 to an overall resolution of 3.7 Å. Five partially hydrated sodium ions are proposed to occupy the center of the conduction pore and the entrance to the coiled-coil domain. We identify an upper gate in the selectivity filter and a lower gate at the entrance to the cytoplasmic coiled-coil domain. Intramolecular interactions exist between the TRP domain and the S4–S5 linker, N-terminal domain, and N and C termini. Finally, we identify aromatic interactions via π–π bonds and cation–π bonds, glycosylation at an N-linked extracellular site, a pore-loop disulfide bond, and 24 lipid binding sites. We compare and contrast this structure with other TRP channels and discuss potential mechanisms of regulation and gating of human full-length TRPM4.
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Reviewers: M.T.N., University of Vermont; D.R., University of Pennsylvania; and T.V., VIB-KU Leuven Center for Brain & Disease Research.
1J.D., Z.L., and J.L. contributed equally to this work.
Contributed by David E. Clapham, January 25, 2018 (sent for review December 19, 2017; reviewed by Mark T. Nelson, Dejian Ren, and Thomas Voets)
Author contributions: J.D., Z.L., J.Z., and D.E.C. designed research; J.D., Z.L., J.L., A.S.-C., S.S.-M., and J.Z. performed research; Z.L., J.L., A.S.-C., S.S.-M., and J.Z. contributed new reagents/analytic tools; J.D., Z.L., J.L., A.S.-C., S.S.-M., J.Z., and D.E.C. analyzed data; and J.D., Z.L., A.S.-C., J.Z., and D.E.C. wrote the paper.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1722038115