title: An Arabidopsis syntaxin homologue isolated by functional complementation of a yeast pep12 mutant.
abstract: The syntaxin family of integral membrane proteins are thought to function as receptors for transport vesicles, with different isoforms of this family localized to various membranes throughout the cell. The yeast Pep12 protein is a syntaxin homologue which may function in the trafficking of vesicles from the trans-Golgi network to the vacuole. We have isolated an Arabidopsis thaliana cDNA by functional complementation of a yeast pep12 mutant. The Arabidopsis cDNA (aPEP12) potentially encodes a 31-kDa protein which is homologous to yeast Pep12 and to other members of the syntaxin family, indicating that this protein may function in the docking or fusion of transport vesicles with the vacuolar membrane in plant cells. Northern blot analysis indicates that the mRNA is expressed in all tissues examined, although at a very low level in leaves. The mRNA is found in all cell types in roots and leaves, as shown by in situ hybridization experiments. The existence of plant homologues of proteins of the syntaxin family indicates that the basic vesicle docking and fusion machinery may be conserved in plants as it is in yeast and mammals.
authors.affiliation: Department of Energy Plant Research Laboratory, Michigan State University, East Lansing 48824-1312, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Bassham
authors.forename: S
authors.initials: S
authors.lastname: Gal
authors.forename: A
authors.initials: A
authors.lastname: da Silva Conceição
authors.forename: N V
authors.initials: NV
authors.lastname: Raikhel
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins; D018076:DNA, Complementary / Q000235:genetics; D004271:DNA, Fungal / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics; D017343:Genes, Plant; D005816:Genetic Complementation Test; D008565:Membrane Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D010940:Plant Proteins / Q000235:genetics; D050765:Qa-SNARE Proteins; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity
chemical_list: C489890:ATPEP12 protein, Arabidopsis; D029681:Arabidopsis Proteins; D018076:DNA, Complementary; D004271:DNA, Fungal; D018744:DNA, Plant; D005656:Fungal Proteins; D008565:Membrane Proteins; C081224:PEP12 protein, S cerevisiae; D010940:Plant Proteins; D050765:Qa-SNARE Proteins; D012333:RNA, Messenger; D018749:RNA, Plant; D029701:Saccharomyces cerevisiae Proteins