LZIP, or CAMP responsive element binding protein 3, is a human gene encoded by CREB3. It may also be known as: Cyclic AMP-responsive element-binding protein 3; CREB-3; cAMP-responsive element-binding protein 3; Leucine zipper protein; Luman; Transcription factor LZIP-alpha; small leucine zipper protein; sLZIP. The encoded protein has an amino acid length of 395 and a mass of 43.9 kDa. Other isoforms may exist. LZIP is a member of the BZIP family, ATF subfamily. Homologs of this gene exist in other organisms, including: Mouse, Frog.