Abstract
Intercellular attachment is an essential process in the morphogenesis of multicellular organisms. A unique mutant, nolac-H18 (nonorganogenic callus with loosely attached cells), generated by T-DNA transformation using leaf-disk cultures of haploid Nicotiana plumbaginifolia, lost the ability to form tight intercellular attachments and adventitious shoots. The gene tagged with T-DNA, named NpGUT1 (glucuronyltransferase 1), was similar to the gene for the catalytic domains of animal glucuronyltransferases and was expressed predominantly in shoot and root apical meristems. The transformation of NpGUT1 complemented the nolac-H18 mutation, and the expression of antisense NpGUT1 RNA produced crumbled shoots. The mutation caused defects in the glucuronic acid of rhamnogalacturonan II of pectin, which drastically reduced the formation of borate cross-linking of rhamnogalacturonan II. NpGUT1, which encodes a unique glucuronyltransferase, is a glycosyltransferase gene identified in pectin biosynthesis and is essential for intercellular attachment in plant meristems and tissues.
MeSH Terms
Amino Acid Sequence
Carbohydrate Sequence
Carbohydrates/analysis
Cell Adhesion
Cell Wall/chemistry
Dimerization
Genes, Recessive
Glucuronosyltransferase/genetics,physiology
Haploidy
Meristem/cytology,metabolism
Microscopy, Electron, Scanning
Molecular Sequence Data
Pectins/biosynthesis
Plant Proteins/genetics,physiology
Plant Shoots
RNA, Antisense/pharmacology
RNA, Messenger/biosynthesis
RNA, Plant/biosynthesis
Sequence Alignment
Sequence Homology, Amino Acid
Tobacco/enzymology
Chemicals
Carbohydrates
Plant Proteins
RNA, Antisense
RNA, Messenger
RNA, Plant
Pectins
galactosylgalactoylxylosylprotein 3-beta-glucuronosyltransferase
Glucuronosyltransferase
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Iwai Hiroaki
Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
Masaoka Nobutaka
Ishii Tadashi
Satoh Shinobu
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