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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.18/157

Título: Folding and rescue of a cystic fibrosis transmembrane conductance regulator trafficking mutant identified using human-murine chimeric proteins
Autor: Da Paula, Ana Carina
Sousa, Marisa
Xu, Zhe
Dawson, Elizabeth S.
Boyd, A. Christopher
Sheppard, David N.
Amaral, Margarida D.
Palavras-chave: Doenças Genéticas
Issue Date: 27-Aug-2010
Editora: The American Society for Biochemistry and Molecular Biology
Citação: J Biol Chem. 2010 Aug 27;285(35):27033-44. Epub 2010 Jun 15
Resumo: Impairment of the cystic fibrosis transmembrane conductance regulator (CFTR) Cl channel causes cystic fibrosis, a fatal genetic disease. Here, to gain insight into CFTR structure and function, we exploited interspecies differences between CFTR homologues using human (h)-murine (m) CFTR chimeras containing murine nucleotide-binding domains (NBDs) or regulatory domain on an hCFTR backbone. Among 15 hmCFTR chimeras analyzed, all but two were correctly processed, one containing part of mNBD1 and another containing part of mNBD2. Based on physicochemical distance analysis of divergent residues between human and murine CFTR in the two misprocessed hmCFTR chimeras, we generated point mutations for analysis of respective CFTR processing and functional properties. We identified one amino acid substitution (K584E-CFTR) that disrupts CFTR processing in NBD1. No single mutation was identified in NBD2 that disrupts protein processing. However, a number of NBD2 mutants altered channel function. Analysis of structural models of CFTR identified that although Lys584 interacts with residue Leu581 in human CFTR Glu584 interacts with Phe581 in mouse CFTR. Introduction of the murine residue (Phe581) in cis with K584E in human CFTR rescued the processing and trafficking defects of K584E-CFTR. Our data demonstrate that human-murine CFTR chimeras may be used to validate structural models of full-length CFTR. We also conclude that hmCFTR chimeras are a valuable tool to elucidate interactions between different domains of CFTR.
Arbitragem científica: yes
URI: http://hdl.handle.net/10400.18/157
ISSN: 0021-9258
Versão do Editor: http://www.jbc.org/content/285/35/27033.full.pdf+html
Appears in Collections:DGH - Artigos em revistas internacionais

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