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Folding and rescue of a cystic fibrosis transmembrane conductance regulator trafficking mutant identified using human-murine chimeric proteins

2010-08-27Artigo científico Acesso aberto
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dc.contributor.authorDa Paula, Ana Carina
dc.contributor.authorSousa, Marisa
dc.contributor.authorXu, Zhe
dc.contributor.authorDawson, Elizabeth S.
dc.contributor.authorBoyd, A. Christopher
dc.contributor.authorSheppard, David N.
dc.contributor.authorAmaral, Margarida D.
dc.date.accessioned2011-09-13T16:41:53Z
dc.date.available2011-09-13T16:41:53Z
dc.date.issued2010-08-27
dc.description.abstractImpairment 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.por
dc.identifier.citationJ Biol Chem. 2010 Aug 27;285(35):27033-44. Epub 2010 Jun 15por
dc.identifier.issn0021-9258
dc.identifier.urihttp://hdl.handle.net/10400.18/157
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherThe American Society for Biochemistry and Molecular Biologypor
dc.relation.publisherversionhttp://www.jbc.org/content/285/35/27033.full.pdf+htmlpor
dc.subjectDoenças Genéticaspor
dc.titleFolding and rescue of a cystic fibrosis transmembrane conductance regulator trafficking mutant identified using human-murine chimeric proteinspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage27044por
oaire.citation.startPage27033por
oaire.citation.titleJournal of Biological Chemistrypor
rcaap.rightsopenAccesspor
rcaap.typearticlepor

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