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Article: A defective flexible loop contributes to the processing and gating defects of the predominant cystic fibrosis–causing mutation

TitleA defective flexible loop contributes to the processing and gating defects of the predominant cystic fibrosis–causing mutation
Authors
KeywordsCFTR
ΔF508 mutation
chloride channel
low temperature
corrector C18
Issue Date2019
PublisherFederation of American Societies for Experimental Biology. The Journal's web site is located at http://www.fasebj.org/
Citation
The FASEB Journal, 2019, v. 33 n. 4, p. 5126-5142 How to Cite?
AbstractPeople with the genetic disease cystic fibrosis (CF) often carry a deletion mutation ΔF508 on the gene encoding the CF transmembrane conductance regulator (CFTR) Cl− channel. This mutation greatly reduces the CFTR maturation process and slows the channel opening rate. Here, we investigate whether residues near F508 contribute to these defects in ΔF508-CFTR. Most deletion mutations, but not alanine substitutions, of individual residues from positions 503 to 513 impaired CFTR maturation. Interestingly, only protein processing of ΔY512-CFTR, like that of ΔF508-CFTR, was greatly improved by low-temperature culture at 27°C or small-molecule corrector C18. The 2 mutant Cl− channels were equally slow to open, suggesting that they may share common structural flaws. Studies on the H3-H4 loop that links residues F508 and Y512 demonstrate that G509A/V510G mutations, moving G509 1 position backward in the loop, markedly enhanced ΔF508-CFTR maturation and opening rate while promoting protein stability and persistence of the H3 helix in ΔF508 nucleotide-binding domain 1. Moreover, V510A/S511A mutations noticeably increased ΔY512-CFTR maturation at 27°C and its opening rate. Thus, loop abnormalities may contribute to ΔF508- and ΔY512-CFTR defects. Importantly, correcting defects from G509 displacement in ΔF508-CFTR may offer a new avenue for drug discovery and CF treatments.—Chen, X., Zhu, S., Zhenin, M., Xu, W., Bose, S. J., Wong, M. P.-F., Leung, G. P. H., Senderowitz, H., Chen, J.-H. A defective flexible loop contributes to the processing and gating defects of the predominant cystic fibrosis–causing mutation.
Persistent Identifierhttp://hdl.handle.net/10722/271141
ISSN
2017 Impact Factor: 5.595
2015 SCImago Journal Rankings: 2.775

 

DC FieldValueLanguage
dc.contributor.authorCHEN, X-
dc.contributor.authorZHU, S-
dc.contributor.authorZhenin, M-
dc.contributor.authorXU, W-
dc.contributor.authorBose, SJ-
dc.contributor.authorWong, MPF-
dc.contributor.authorLeung, GPH-
dc.contributor.authorSenderowitz, H-
dc.contributor.authorChen, JH-
dc.date.accessioned2019-06-24T01:04:06Z-
dc.date.available2019-06-24T01:04:06Z-
dc.date.issued2019-
dc.identifier.citationThe FASEB Journal, 2019, v. 33 n. 4, p. 5126-5142-
dc.identifier.issn0892-6638-
dc.identifier.urihttp://hdl.handle.net/10722/271141-
dc.description.abstractPeople with the genetic disease cystic fibrosis (CF) often carry a deletion mutation ΔF508 on the gene encoding the CF transmembrane conductance regulator (CFTR) Cl− channel. This mutation greatly reduces the CFTR maturation process and slows the channel opening rate. Here, we investigate whether residues near F508 contribute to these defects in ΔF508-CFTR. Most deletion mutations, but not alanine substitutions, of individual residues from positions 503 to 513 impaired CFTR maturation. Interestingly, only protein processing of ΔY512-CFTR, like that of ΔF508-CFTR, was greatly improved by low-temperature culture at 27°C or small-molecule corrector C18. The 2 mutant Cl− channels were equally slow to open, suggesting that they may share common structural flaws. Studies on the H3-H4 loop that links residues F508 and Y512 demonstrate that G509A/V510G mutations, moving G509 1 position backward in the loop, markedly enhanced ΔF508-CFTR maturation and opening rate while promoting protein stability and persistence of the H3 helix in ΔF508 nucleotide-binding domain 1. Moreover, V510A/S511A mutations noticeably increased ΔY512-CFTR maturation at 27°C and its opening rate. Thus, loop abnormalities may contribute to ΔF508- and ΔY512-CFTR defects. Importantly, correcting defects from G509 displacement in ΔF508-CFTR may offer a new avenue for drug discovery and CF treatments.—Chen, X., Zhu, S., Zhenin, M., Xu, W., Bose, S. J., Wong, M. P.-F., Leung, G. P. H., Senderowitz, H., Chen, J.-H. A defective flexible loop contributes to the processing and gating defects of the predominant cystic fibrosis–causing mutation.-
dc.languageeng-
dc.publisherFederation of American Societies for Experimental Biology. The Journal's web site is located at http://www.fasebj.org/-
dc.relation.ispartofThe FASEB Journal-
dc.subjectCFTR-
dc.subjectΔF508 mutation-
dc.subjectchloride channel-
dc.subjectlow temperature-
dc.subjectcorrector C18-
dc.titleA defective flexible loop contributes to the processing and gating defects of the predominant cystic fibrosis–causing mutation-
dc.typeArticle-
dc.identifier.emailWong, MPF: pfwong@hku.hk-
dc.identifier.emailLeung, GPH: gphleung@hkucc.hku.hk-
dc.identifier.authorityLeung, GPH=rp00234-
dc.identifier.authorityChen, JH=rp01518-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1096/fj.201801218RR-
dc.identifier.pmid30668920-
dc.identifier.scopuseid_2-s2.0-85064138138-
dc.identifier.hkuros297957-
dc.identifier.volume33-
dc.identifier.issue4-
dc.identifier.spage5126-
dc.identifier.epage5142-
dc.publisher.placeUnited States-

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