Serine Palmitoyltransferase Subunit 1 is Present in the Endoplasmic Reticulum, Nucleus and Focal Adhesions, and Functions in Cell Morphology

Overview

Journal Biochim Biophys Acta

Specialties Biochemistry
Biophysics

Date 2009 Apr 14

PMID 19362163

Citations 5

Authors

Jia Wei

Tokunbo Yerokun

Martina Leipelt

Chris A Haynes

Harish Radhakrishna

Amin Momin

Samuel Kelly

HyeJung Park

Elaine Wang

Jill M Carton

David J Uhlinger

Alfred H Merrill Jr

Affiliations

Soon will be listed here.

Abstract

Serine palmitoyltransferase (SPT) has been localized to the endoplasmic reticulum (ER) by subcellular fractionation and enzymatic assays, and fluorescence microscopy of epitope-tagged SPT; however, our studies have suggested that SPT subunit 1 might be present also in focal adhesions and the nucleus. These additional locations have been confirmed by confocal microscopy using HEK293 and HeLa cells, and for focal adhesions by the demonstration that SPT1 co-immunoprecipitates with vinculin, a focal adhesion marker protein. The focal adhesion localization of SPT1 is associated with cell morphology, and possibly cell migration, because it is seen in most cells before they reach confluence but disappears when they become confluent, and is restored by a standard scratch-wound healing assay. Conversely, elimination of SPT1 using SPTLC1 siRNA causes cell rounding. Thus, in addition to its "traditional" localization in the ER for de novo sphingolipid biosynthesis, SPT1 is present in other cellular compartments, including focal adhesions where it is associated with cell morphology.

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