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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(48
): 33066-71
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The human synaptic vesicle protein, SV2A, functions as a galactose transporter in
Saccharomyces cerevisiae
#MMPMID25326386
Madeo M
; Kovács AD
; Pearce DA
J Biol Chem
2014[Nov]; 289
(48
): 33066-71
PMID25326386
show ga
SV2A is a synaptic vesicle membrane protein expressed in neurons and endocrine
cells and involved in the regulation of neurotransmitter release. Although the
exact function of SV2A still remains elusive, it was identified as the specific
binding site for levetiracetam, a second generation antiepileptic drug. Our
sequence analysis demonstrates that SV2A has significant homology with several
yeast transport proteins belonging to the major facilitator superfamily (MFS).
Many of these transporters are involved in sugar transport into yeast cells. Here
we present evidence showing, for the first time, that SV2A is a galactose
transporter. We expressed human SV2A in hexose transport-deficient EBY.VW4000
yeast cells and demonstrated that these cells are able to grow on
galactose-containing medium but not on other fermentable carbon sources.
Furthermore, the addition of the SV2A-binding antiepileptic drug levetiracetam to
the medium inhibited the galactose-dependent growth of hexose transport-deficient
EBY.VW4000 yeast cells expressing human SV2A. Most importantly, direct
measurement of galactose uptake in the same strain verified that SV2A is able to
transport extracellular galactose inside the cells. The newly identified
galactose transport capability of SV2A may have an important role in
regulating/modulating synaptic function.