The protein encoded by this gene is a member of the cAMP-dependent protein kinase inhibitor family. Studies of a similar protein in rat suggest that this protein may interact with the catalytic subunit of cAMP-dependent protein kinase and act as a competitive inhibitor. At least three alternatively spliced transcript variants encoding the same protein have been reported.[6]
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Yu J, Yu L, Chen Z, et al. (2002). "Protein inhibitor of neuronal nitric oxide synthase interacts with protein kinase A inhibitors". Brain Res. Mol. Brain Res. 99 (2): 145–9. doi:10.1016/S0169-328X(02)00104-3. PMID11978406.