Sites of the NUDT9-H domain critical for ADP-ribose activation of the cation channel TRPM2.

The Journal of Biological Chemistry
Frank J P Kühn, Andreas Lückhoff

Abstract

TRPM2 is a cation channel unique within the transient receptor potential family because of its gating by ADP-ribose (ADPR). ADPR gating is enabled by a cytosolic C-terminal Nudix box sequence motif embedded into a region homologous to the NUDT9 ADPR pyrophosphatase. A recently discovered splice variant of TRPM2 (TRPM2-DeltaC) lacks 34 amino acid residues in the NUDT9 domain and is insensitive to ADPR. To analyze in detail which parts of the deleted sequence (DeltaC-stretch) are critical for ADPR gating, we tested mutants that lacked 19, 25, and 29 amino acid residues in the N-terminal part or had amino acid residues substituted in the remaining C-terminal part of the DeltaC-stretch. All of these mutants displayed typical ADPR-induced currents. However, the deletion or substitution of the amino acid residue Asn-1326 immediately downstream of the DeltaC-stretch abrogated ADPR gating. We furthermore analyzed the mutation I1405E/L1406F in the Nudix box of TRPM2, because a considerably decreased AD-PRase activity of the TRPM2 NUDT9-H protein in comparison to the NUDT9 pyrophosphatase has been attributed to the reverse exchange EF --> IL. The I1405E/L1406F variant of TRPM2 failed to respond to ADPR even at concentrations up to 10 mM....Continue Reading

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