This is leucine-zipper is found in the enterobacterial outer membrane lipoprotein LPP. It is likely that this domain oligomerises and is involved in protein-protein interactions. As such it is a bundle of alpha-helical coiled-coils, which are known to play key roles in mediating specific protein-protein interactions for in molecular recognition and the assembly of multi-protein complexes.

1: Core structure of the outer membrane lipoprotein from Escherichia coli at 1.9 A resolution. Shu W, Liu J, Ji H, Lu M; J Mol Biol. 2000;299:1101-1112. PMID:10843861

2: Core side-chain packing and backbone conformation in Lpp-56 coiled-coil mutants. Liu J, Cao W, Lu M; J Mol Biol. 2002;318:877-888. PMID:12054830

3: Zinc-mediated helix capping in a triple-helical protein. Liu J, Dai J, Lu M; Biochemistry. 2003;42:5657-5664. PMID:12741822

4: Atomic structure of a tryptophan-zipper pentamer. Liu J, Yong W, Deng Y, Kallenbach NR, Lu M; Proc Natl Acad Sci U S A. 2004;101:16156-16161. PMID:15520380

5: Conformational transition between four and five-stranded phenylalanine zippers determined by a local packing interaction. Liu J, Zheng Q, Deng Y, Kallenbach NR, Lu M; J Mol Biol. 2006;361:168-179. PMID:16828114