Enables identical protein binding activity. Predicted to be involved in protein refolding and response to heat. Located in cytoplasm. Expressed in hypodermis; intestine; muscle cell; and spermatid. Human ortholog(s) of this gene implicated in cataract (multiple); dilated cardiomyopathy 1II; and myofibrillar myopathy (multiple). Is an ortholog of human CRYAA (crystallin alpha A); CRYAB (crystallin alpha B); and HSPB6 (heat shock protein family B (small) member 6).