Characterization of the C-terminal ER membrane anchor of PTP1B.

Characterization of the C-terminal ER membrane anchor of PTP1B. Research Abstract Details 

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Characterization of the C-terminal ER membrane anchor of PTP1B. Abstract Text:

Ines Anderie,Irene Schulz,Andreas Schmid,

The tyrosine phosphatase PTP1B is an important regulator of cell function. In living cells PTP1B activity is restricted to the vicinity of the endoplasmic reticulum (ER) by post-translational C-terminal attachment of PTP1B to the ER membrane network. In our study we investigated the membrane anchor of PTP1B by use of EGFP fusion proteins. We demonstrate that the membrane anchor of PTP1B cannot be narrowed down to a unique amino acid sequence with a defined start and stop point but rather is moveable within several amino acids. Removal of up to seven amino acids from the C-terminus, as well as exchange of single amino acids in the putative transmembrane sequence did not influence subcellular localization of PTP1B. With the method of bimolecular fluorescence complementation we could demonstrate dimerization of PTP1B in vivo. Homodimerization was, in contrast to other tail-anchored proteins, not dependent on the membrane anchor. Our data demonstrate that the C-terminal membrane anchor of PTP1B is formed by a combination of a single stretch transmembrane domain (TMD) followed by a tail. TMD and tail length are variable and there are no sequence-specific features. Our data for PTP1B are consistent with a concept that explains the ER membrane anchor of tail-anchored proteins as a physicochemical structure.

Characterization of the C-terminal ER membrane anchor of PTP1B. Publishing Authors By Initials

I Anderie,I Schulz,A Schmid,

For similar proteins: recombinant proteins: recombinant fusion proteins research abstracts see: proteins: recombinant proteins: recombinant fusion proteins research

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Characterization of the C-terminal ER membrane anchor of PTP1B. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental cell research

VOLUME: 313

Page Numbers: 3189-97

Journal Abbreviation: Exp. Cell Res.

ISSN: 0014-4827

DAY: 27

MONTH: 06

YEAR: 2007

Characterization of the C-terminal ER membrane anchor of PTP1B. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 373226

Characterization of the C-terminal ER membrane anchor of PTP1B. Keywords Mesh Terms:

KEYWORDS: Recombinant Fusion Proteins

MESH TERMS: metabolism

Chemical & Substance for Abstract: Characterization of the C-terminal ER membrane anchor of PTP1B. Information

Substance Name: Protein Tyrosine Phosphatase, Non-Recept

Registry Number: EC 3.1.3.48

Grant and Affiliation Information for Characterization of the C-terminal ER membrane anchor of PTP1B.

AFFILIATION: Department of Physiology, University of the Saarland, D-66421 Homburg/Saar, Germany. ines.anderie@uniklinikum-saarland.de

Country: United States

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MEDLINETA: Exp Cell Res

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