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Vol. 12, Issue 12, 3733-3743, December 2001
and
§
*Department of Energy Plant Research Laboratory, Michigan State
University, East Lansing, Michigan 48824-1312; and
The syntaxin family of soluble N-ethyl maleimide
sensitive factor adaptor protein receptors (SNAREs) is known to play an
important role in the fusion of transport vesicles with specific
organelles. Twenty-four syntaxins are encoded in the genome of the
model plant Arabidopsis thaliana. These 24 genes are
found in 10 gene families and have been reclassified as syntaxins of
plants (SYPs). Some of these gene families have been previously
characterized, with the SYP2-type syntaxins being found in the
prevacuolar compartment (PVC) and the SYP4-type syntaxins on the
trans-Golgi network (TGN). Here we report on two
previously uncharacterized syntaxin groups. The SYP5 group is encoded
by a two-member gene family, whereas SYP61 is a single gene. Both types
of syntaxins are localized to multiple compartments of the endomembrane
system, including the TGN and the PVC. These two groups of syntaxins
form SNARE complexes with each other, and with other Arabidopsis
SNAREs. On the TGN, SYP61 forms complexes with the SNARE VTI12 and
either SYP41 or SYP42. SYP51 and SYP61 interact with each other and
with VTI12, most likely also on the TGN. On the PVC, a SYP5-type
syntaxin interacts specifically with a SYP2-type syntaxin, as well as
the SNARE VTI11, forming a SNARE complex likely involved in TGN-to-PVC trafficking.
Department of Biochemistry, Michigan State University,
East Lansing, Michigan 48824-1319
Current address: Department of Botany and Center
for Plant Responses to Environmental Stresses, 353 Bessey Hall, Iowa
State University, Ames, IA 50011.
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