May play a role in triacylglycerol packaging into adipocytes. May function as a coat protein involved in the biogenesis of lipid droplets. Nascent lipid droplet surface-associated; association with lipid droplets is triacylglycerol synthesis-dependent. Specifically expressed in white adipose tissue and also weakly detected in heart and skeletal muscle (at protein level). Up-regulated by PPARG and during adipocyte differentiation. Belongs to the perilipin family. Truncated N-terminus.