Enables FK506 binding activity and cyclic nucleotide binding activity. Involved in several processes, including positive regulation of axon regeneration; response to hydrogen peroxide; and response to vitamin E. Located in intracellular membrane-bounded organelle. Biomarker of cardiomyopathy and congestive heart failure. Human ortholog(s) of this gene implicated in Graves' disease. Orthologous to human FKBP1B (FKBP prolyl isomerase 1B). [provided by Alliance of Genome Resources, Apr 2022]