The anti-epileptic, anti-hyperalgesic, and anxiolytic agent gabapentin (1-(aminomethyl)-cyclohexane acetic acid or Neurontin) has previously been shown to bind with high affinity to the ␣ 2 ␦ subunit of voltage-dependent calcium channels (Gee, N. S., Brown, J. P., Dissanayake, V. U. K., Offord, J., Thurlow, R., and Woodruff, G.N. (1996) J. Biol. Chem. 271, 5768 -5776). We report here the cloning, sequencing, and deletion mutagenesis of the ␣ 2 ␦ subunit from porcine brain. The deduced protein sequence has a 95.9 and 98.2% identity to the rat and human neuronal ␣ 2 ␦ sequences, respectively.