Both the PH domain and N-terminal region of oxysterol-binding protein related protein 8S are required for localization to PM-ER contact sites.

Abstract:

:Oxysterol-binding protein-related proteins are implicated in the sensing and transporting lipids at the membrane contact sites. One of the members of the mammalian ORP family, ORP8, is thought to transport lipids through directly tethering both ER and PM membranes. Targeting to PM is thought to be mediated by N-terminal pleckstrin homology domain via binding to phosphoinositides. Sequence alignments and NMR structural determination revealed that the PH domain of ORP8 is atypical and contains an insertion of 20 amino acids in an unstructured loop region that may potentially block interactions with ligands. Using standard lipid-protein overlay assays or liposomal binding assays we could not detect binding of a recombinant version of the PH domain. Examination of a series of deletion constructs demonstrated that both the N-terminal polybasic region and the PH domain are required for proper targeting of the short splice variant ORP8S to the PM-ER contact site in Chinese hamster ovary cells.

authors

Lee M,Fairn GD

doi

10.1016/j.bbrc.2018.01.138

subject

Has Abstract

pub_date

2018-02-19 00:00:00

pages

1088-1094

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(18)30159-1

journal_volume

496

pub_type

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