NMR structure of the LCCL domain and implications for DFNA9 deafness disorder.Liepinsh, E., Trexler, M., Kaikkonen, A., Weigelt, J., Banyai, L., Patthy, L., Otting, G.
(2001) EMBO J 20: 5347-5353
- PubMed: 11574466
- DOI: https://doi.org/10.1093/emboj/20.19.5347
- Primary Citation of Related Structures:
- PubMed Abstract:
The LCCL domain is a recently discovered, conserved protein module named after its presence in Limulus factor C, cochlear protein Coch-5b2 and late gestation lung protein Lgl1. The LCCL domain plays a key role in the autosomal dominant human deafness disorder DFNA9. Here we report the nuclear magnetic resonance (NMR) structure of the LCCL domain from human Coch-5b2, where dominant mutations leading to DFNA9 deafness disorder have been identified. The fold is novel. Four of the five known DFNA9 mutations are shown to involve at least partially solvent-exposed residues. Except for the Trp91Arg mutant, expression of these four LCCL mutants resulted in misfolded proteins. These results suggest that Trp91 participates in the interaction with a binding partner. The unexpected sensitivity of the fold with respect to mutations of solvent-accessible residues might be attributed to interference with the folding pathway of this disulfide-containing domain.
Department of Medical Biochemistry and Biophysics, Karolinska Institute, 17177 Stockholm, Sweden.