Short transient receptor potential channel: Difference between revisions
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== Structural highlights ==1. The channel, when TRPC1 is incorporated, loses the 4-fold symmetry with one TRPC1 and three TRPC4. This change in arrangement breaks the symmetry of the pore and creates a different, asymmetric ion-conduction pathway. | == Structural highlights ==1. The channel, when TRPC1 is incorporated, loses the 4-fold symmetry with one TRPC1 and three TRPC4. This change in arrangement breaks the symmetry of the pore and creates a different, asymmetric ion-conduction pathway. <ref>Won, J., Kim, J., Kim, J. et al. (2025). Cryo-EM structure of the heteromeric TRPC1/TRPC4 channel. ''Nature Structural & Molecular Biology'', 32(2):326–338. DOI: 10.1038/s41594-024-01408-1</ref>[[Image:Asymmetry_(TRPC1_TRPC4_Stoichiometry)_.png]] | ||
2. The selectivity filter loop(two maino acids longer than the corresponding loop in TRPC4) causes the loop to protrude further into the pore. L601 from TRPC1 is the key residue responsible for this, as it physically projects into the ion pathway, narrowing the pore radius. These change the channels' preference for monovalent channels. | 2. The selectivity filter loop(two maino acids longer than the corresponding loop in TRPC4) causes the loop to protrude further into the pore. L601 from TRPC1 is the key residue responsible for this, as it physically projects into the ion pathway, narrowing the pore radius. These change the channels' preference for monovalent channels. | ||
<ref>Won, J., Kim, J., Kim, J. et al. (2025). Cryo-EM structure of the heteromeric TRPC1/TRPC4 channel. ''Nature Structural & Molecular Biology'', 32(2):326–338. DOI: 10.1038/s41594-024-01408-1</ref> | <ref>Won, J., Kim, J., Kim, J. et al. (2025). Cryo-EM structure of the heteromeric TRPC1/TRPC4 channel. ''Nature Structural & Molecular Biology'', 32(2):326–338. DOI: 10.1038/s41594-024-01408-1</ref>[[Image:Selectivity_Filter_Narrowing_(L601)_.png]] | ||
3. Calcium permeability is determined by the S6 helix present depeer in the pore. The TRPC1 subunit provides K639 here, which carries a positive charge in the central cavity of the pore. This creates an electropositive environment repelling calcium, which is also positively charged. <ref>Won, J., Kim, J., Kim, J. et al. (2025). Cryo-EM structure of the heteromeric TRPC1/TRPC4 channel. ''Nature Structural & Molecular Biology'', 32(2):326–338. DOI: 10.1038/s41594-024-01408-1</ref> | 3. Calcium permeability is determined by the S6 helix present depeer in the pore. The TRPC1 subunit provides K639 here, which carries a positive charge in the central cavity of the pore. This creates an electropositive environment repelling calcium, which is also positively charged. <ref>Won, J., Kim, J., Kim, J. et al. (2025). Cryo-EM structure of the heteromeric TRPC1/TRPC4 channel. ''Nature Structural & Molecular Biology'', 32(2):326–338. DOI: 10.1038/s41594-024-01408-1</ref>[[Image:Calcium_Permeability_(K639_in_S6)_.png]] | ||
