Membrane insertion, processing, and topology of cystic fibrosis transmembrane conductance regulator (CFTR) in microsomal membranes.

Abstract:

:Cystic fibrosis transmembrane conductance regulator (CFTR) is a cAMP-regulated C1(-) channel. Malfunction of CFTR causes cystic fibrosis (CF). CFTR belongs to an ATP-binding cassette (ABC) transporter superfamily which includes P-glycoprotein (Pgp), the molecule that is responsible for multidrug resistance in cancer cells. P-glycoprotein molecules have been suggested to have more than one topology and function. In this study, we analysed the early stages of membrane insertion, processing, and topology of human CFTR using rabbit reticulocyte lysate and wheat germ extract translation systems supplemented with canine pancreatic microsomal membranes. Our results suggest that CFTR contains an uncleavable signal sequence and its membrane targeting and insertion may depend on the signal recognition particle (SRP) and SRP receptor. The topology of CFTR in microsomal membranes is the same as the one predicted based on hydropathy plot analysis. These results, together with our previous findings on Pgp, indicate that (1) the topologies of mammalian ABC transporters can be dissected and studied using protein fusion chimeras in a cell-tree system; and (2) the membrane targeting and insertion of CFTR and Pgp may take the same pathway, i.e., the SRP-dependent pathway, but the membrane folding mechanism of these two proteins in microsomal membranes is probably different.

journal_name

Mol Membr Biol

authors

Chen M,Zhang JT

doi

10.3109/09687689609160572

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

33-40

issue

1

eissn

0968-7688

issn

1464-5203

journal_volume

13

pub_type

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