title: Analysis of endocytosis and ubiquitination of the BOR1 transporter.
abstract: Endocytosis and membrane trafficking are the major factors controlling the abundance of plasma membrane proteins, such as transporters and receptors. We have found that Arabidopsis borate transporter BOR1 is polarly localized to the inner (stele-facing) plasma membrane domain of various root cells under boron limitation, and when boron is supplied in excess, BOR1 is rapidly transferred to the vacuole for immediate degradation. The BOR1 polarity and degradation are controlled by membrane trafficking including endocytosis. In this chapter, we describe methods for observation of endocytic trafficking of BOR1, and detection of BOR1 ubiquitination that is required for vacuolar sorting for degradation.
authors.affiliation: Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan, ukkasai@mail.ecc.u-tokyo.ac.jp.
authors.forename: Koji
authors.initials: K
authors.lastname: Kasai
authors.forename: Junpei
authors.initials: J
authors.lastname: Takano
authors.forename: Toru
authors.initials: T
authors.lastname: Fujiwara
mesh_terms: D017920:Antiporters / Q000302:isolation & purification* / Q000378:metabolism; D017360:Arabidopsis / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000302:isolation & purification* / Q000378:metabolism; D004705:Endocytosis; D008967:Molecular Biology / Q000379:methods*; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism; D021381:Protein Transport / Q000235:genetics; D059748:Proteolysis; D054875:Ubiquitination / Q000235:genetics; D014617:Vacuoles / Q000378:metabolism
chemical_list: D017920:Antiporters; D029681:Arabidopsis Proteins; C469216:BOR1 protein, Arabidopsis