Disruption of individual members of Arabidopsis syntaxin gene families indicates each has essential functions.
Syntaxins are a large group of proteins found in all eukaryotes involved in the fusion of transport vesicles to target membranes. Twenty-four syntaxins grouped into 10 gene families are found in the model plant Arabidopsis thaliana, each group containing one to five paralogous members. The Arabidopsis SYP2 and SYP4 gene families contain three members each that share 60 to 80% protein sequence identity. Gene disruptions of the yeast (Saccharomyces cerevisiae) orthologs of the SYP2 and SYP4 gene families (Pep12p and Tlg2p, respectively) indicate that these syntaxins are not essential for growth in yeast. However, we have isolated and characterized gene disruptions in two genes from each family, finding that disruption of individual syntaxins from these families is lethal in the male gametophyte of Arabidopsis. Complementation of the syp21-1 gene disruption with its cognate transgene indicated that the lethality is linked to the loss of the single syntaxin gene. Thus, it is clear that each syntaxin in the SYP2 and SYP4 families serves an essential nonredundant function.
Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
A A
AA
Sanderfoot
M
M
Pilgrim
L
L
Adam
N V
NV
Raikhel
D017360:Arabidopsis / Q000235:genetics*; D015153:Blotting, Western; D017931:DNA Primers; D004251:DNA Transposable Elements / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D005816:Genetic Complementation Test; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism*; D005810:Multigene Family; D009154:Mutation; D010940:Plant Proteins / Q000235:genetics*; D011058:Pollen / Q000235:genetics / Q000254:growth & development; D016133:Polymerase Chain Reaction; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000235:genetics; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D017931:DNA Primers; D004251:DNA Transposable Elements; D018744:DNA, Plant; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D010940:Plant Proteins; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases