Further studies of the role of cyclic beta-glucans in symbiosis. An NdvC mutant of Bradyrhizobium japonicum synthesizes cyclodecakis-(1-->3)-beta-glucosyl.

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Autoři: Bhagwat AA; U.S. Dept. of Agriculture, Building 006, BARC-W, Beltsville, Maryland 20705, USA. arvind@wam.umd.edu, Mithöfer A, Pfeffer PE, Kraus C, Spickers N, Hotchkiss A, Ebel J, Keister DL
Zdroj: Plant physiology [Plant Physiol] 1999 Mar; Vol. 119 (3), pp. 1057-64.
Způsob vydávání: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.
Jazyk: English
Informace o časopise: Publisher: American Society of Plant Biologists Country of Publication: United States NLM ID: 0401224 Publication Model: Print Cited Medium: Print ISSN: 0032-0889 (Print) Linking ISSN: 00320889 NLM ISO Abbreviation: Plant Physiol Subsets: MEDLINE
Imprint Name(s): Publication: : [Rockville, MD] : American Society of Plant Biologists
Original Publication: Lancaster, Pa., American Society of Plant Physiologists.
Výrazy ze slovníku MeSH: Bradyrhizobium/*genetics , Bradyrhizobium/*physiology , Glucans/*biosynthesis , Symbiosis/*genetics , Symbiosis/*physiology, Carbohydrate Sequence ; Genes, Bacterial ; Glucans/chemistry ; Molecular Sequence Data ; Mutation ; Glycine max/microbiology
Abstrakt: The cyclic beta-(1-->3),beta-(1-->6)-D-glucan synthesis locus of Bradyrhizobium japonicum is composed of at least two genes, ndvB and ndvC. Mutation in either gene affects glucan synthesis, as well as the ability of the bacterium to establish a successful symbiotic interaction with the legume host soybean (Glycine max). B. japonicum strain AB-14 (ndvB::Tn5) does not synthesize beta-glucans, and strain AB-1 (ndvC::Tn5) synthesizes a cyclic beta-glucan lacking beta-(1-->6)-glycosidic bonds. We determined that the structure of the glucan synthesized by strain AB-1 is cyclodecakis-(1-->3)-beta-D-glucosyl, a cyclic beta-(1-->3)-linked decasaccharide in which one of the residues is substituted in the 6 position with beta-laminaribiose. Cyclodecakis-(1-->3)-beta-D-glucosyl did not suppress the fungal beta-glucan-induced plant defense response in soybean cotyledons and had much lower affinity for the putative membrane receptor protein than cyclic beta-(1-->3),beta-(1-->6)-glucans produced by wild-type B. japonicum. This is consistent with the hypothesis presented previously that the wild-type cyclic beta-glucans may function as suppressors of a host defense response.
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Substance Nomenclature: 0 (Glucans)
Entry Date(s): Date Created: 19990309 Date Completed: 19990503 Latest Revision: 20231213
Update Code: 20240829
PubMed Central ID: PMC32087
DOI: 10.1104/pp.119.3.1057
PMID: 10069844
Autor: Bhagwat AA; U.S. Dept. of Agriculture, Building 006, BARC-W, Beltsville, Maryland 20705, USA. arvind@wam.umd.edu, Mithöfer A, Pfeffer PE, Kraus C, Spickers N, Hotchkiss A, Ebel J, Keister DL
Jazyk: angličtina
Zdroj: Plant physiology [Plant Physiol] 1999 Mar; Vol. 119 (3), pp. 1057-64.
DOI: 10.1104/pp.119.3.1057
Abstrakt: The cyclic beta-(1-->3),beta-(1-->6)-D-glucan synthesis locus of Bradyrhizobium japonicum is composed of at least two genes, ndvB and ndvC. Mutation in either gene affects glucan synthesis, as well as the ability of the bacterium to establish a successful symbiotic interaction with the legume host soybean (Glycine max). B. japonicum strain AB-14 (ndvB::Tn5) does not synthesize beta-glucans, and strain AB-1 (ndvC::Tn5) synthesizes a cyclic beta-glucan lacking beta-(1-->6)-glycosidic bonds. We determined that the structure of the glucan synthesized by strain AB-1 is cyclodecakis-(1-->3)-beta-D-glucosyl, a cyclic beta-(1-->3)-linked decasaccharide in which one of the residues is substituted in the 6 position with beta-laminaribiose. Cyclodecakis-(1-->3)-beta-D-glucosyl did not suppress the fungal beta-glucan-induced plant defense response in soybean cotyledons and had much lower affinity for the putative membrane receptor protein than cyclic beta-(1-->3),beta-(1-->6)-glucans produced by wild-type B. japonicum. This is consistent with the hypothesis presented previously that the wild-type cyclic beta-glucans may function as suppressors of a host defense response.
Databáze: MEDLINE
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