Leucine zipper, Myc (IPR003327)

Short name: Myc-LZ

Overlapping homologous superfamilies

Domain relationships



This family consists of the leucine zipper dimerisation domain found in both cellular c-Myc proto-oncogenes and viral v-Myc oncogenes. Dimerisation via the leucine zipper motif with other basic helix-loop-helix-leucine zipper (b/HLH/lz) proteins is required for efficient DNA binding [PMID: 9680483]. The Myc-Max dimer is a transactivating complex activating expression of growth related genes promoting cell proliferation. The dimerisation is facilitated via interdigitating leucine residues every 7th position of the alpha helix. Like charge repulsion of adjacent residues in this region preturbs the formation of homodimers with heterodimers being promoted by opposing charge attractions. It has been demonstrated that in transgenic mice the balance between oncogene-induced proliferation and apoptosis in a given tissue can be a critical determinant in the initiation and maintenance of the tumor [PMID: 10679391].

GO terms

Biological Process

GO:0006355 regulation of transcription, DNA-templated

Molecular Function

GO:0003700 DNA-binding transcription factor activity

Cellular Component

GO:0005634 nucleus

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.