Functional characterization of the promoter for the mouse SPTLC2 gene, which encodes subunit 2 of serine palmitoyltransferase

A series of luciferase reporter constructs was prepared from a 1035-bp fragment of mouse genomic DNA flanking the 5′-coding sequence for the SPTLC2 subunit of serine palmitoyltransferase, the initial enzyme of de novo sphingolipid biosynthesis. The full-length DNA fragment promoted strong reporter gene expression in NIH3T3 cells while deletion and site-directed mutagenesis indicated that the proximal 335 bp contain initiator and downstream promoter elements, two proximal GC boxes that appear to stimulate transcription in a cooperative manner, and several additional elements whose activity cannot be accounted for by known factor binding sites. These findings provide insight into the control mechanisms for transcription of mammalian SPTLC2.