SYP71, a plant-specific Qc-SNARE protein, reveals dual localization to the plasma membrane and the endoplasmic reticulum in Arabidopsis.
SNAREs ('Soluble N-ethyl-maleimide sensitive factor attachment protein receptors') play a critical role in the membrane fusion step of the vesicular transport system in eukaryotes. The number of the genes encoding SNARE proteins is estimated to be 64 in Arabidopsis thaliana. This number is much larger than those in other eukaryotes, suggesting a complex membrane trafficking in plants. The Arabidopsis SNAREs, the SYP7 group proteins, SYP71, SYP72, and SYP73, form a plant-specific SNARE subfamily with not-yet-identified functions. We have previously reported that the SYP7 subfamily proteins are predominantly localized to the endoplasmic reticulum in the Arabidopsis suspension cultured cells under transient expression condition. However, several proteomic analyzes indicated the plasma membrane localizations of one of SYP7 subfamily proteins, SYP71. In order to confirm the expression patterns and subcellular localization of SYP7, we performed combination analyses including promoter GUS analysis, a sucrose density gradient centrifugation analysis, as well as an observation on transgenic Arabidopsis plants expressing GFP-fused SYP71 under control of its native promoter. From these analyses, we concluded that one of the SYP7 subfamily proteins, SYP71, is predominantly expressed in all vegetative tissues and mainly localized to the plasma membrane. We also found that SYP71 is localized to the endoplasmic reticulum in the dividing cells of various types of tissues.
Suwastika
I Nengah
IN
Graduate School of Biostudies, Kyoto University, Kyoto, Japan. suwastika@lif.kyoto-u.ac.jp
Uemura
Tomohiro
T
Shiina
Takashi
T
Sato
Masa H
MH
Takeyasu
Kunio
K
D017360:Arabidopsis / Q000166:cytology* / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism*; D002455:Cell Division; D002462:Cell Membrane / Q000378:metabolism*; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D050767:Qc-SNARE Proteins / Q000378:metabolism*; D013045:Species Specificity
D029681:Arabidopsis Proteins; D050767:Qc-SNARE Proteins; C534241:SYP71 protein, Arabidopsis