3ux2

Publication Abstract from PubMed

Fam96a mRNA, which encodes a mammalian DUF59 protein, is enriched in macrophages. Recombinant human Fam96a forms stable monomers and dimers in solution. Crystal structures of these two forms revealed that each adopts a distinct type of domain-swapped dimer, one of which is stabilized by zinc binding. Two hinge loops control Fam96a domain swapping; both are flexible and highly conserved, suggesting that domain swapping may be a common feature of eukaryotic but not bacterial DUF59 proteins. The derived monomer fold of Fam96a diverges from that of bacterial DUF59 counterparts in that the C-terminal region of Fam96a is much longer and is positioned on the opposite side of the N-terminal core fold. The putative metal-binding site of bacterial DUF59 proteins is not conserved in Fam96a, but Fam96a interacts tightly in vitro with Ciao1, the cytosolic iron-assembly protein. Moreover, Fam96a and Ciao1 can be co-immunoprecipitated, suggesting that the interaction also occurs in vivo. Although predicted to have a signal peptide, it is shown that Fam96a is cytoplasmic. The data reveal that eukaryotic DUF59 proteins share intriguing characteristics with amyloidogenic proteins.

The mammalian DUF59 protein Fam96a forms two distinct types of domain-swapped dimer.,Chen KE, Richards AA, Ariffin JK, Ross IL, Sweet MJ, Kellie S, Kobe B, Martin JL Acta Crystallogr D Biol Crystallogr. 2012 Jun;68(Pt 6):637-48. doi:, 10.1107/S0907444912006592. Epub 2012 May 17. PMID:22683786^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.