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A point mutation in the ethylene-inducing xylanase elicitor inhibits the β-1-4-endoxylanase activity but not the elicitation activity
Year:
1999
Source of publication :
Plant physiology (source)
Authors :
Chejanovsky, Nor
;
.
Volume :
121
Co-Authors:
Furman-Matarasso, N., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Cohen, E., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Du, Q., Department of Entomology, Institute of Plant Protection, Volcani Center, Bet-Dagan 50250, Israel
Chejanovsky, N., Department of Entomology, Institute of Plant Protection, Volcani Center, Bet-Dagan 50250, Israel
Hanania, U., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Avni, A., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Facilitators :
From page:
345
To page:
351
(
Total pages:
7
)
Abstract:
Ethylene-inducing xylanase (EIX) elicits plant defense responses in certain tobacco (Nicotiana tabacum) and tomato cultivars in addition to its xylan degradation activity. It is not clear, however, whether elicitation occurs by cell wall fragments released by the enzymatic activity or by the xylanase protein interacting directly with the plant cells. We cloned the gene encoding EIX protein and overexpressed it in insect cells. To determine the relationship between the two activities, substitution of amino acids in the xylanase active site was performed. Substitution at glutamic acid-86 or -177 with glutamine (Gln), aspartic acid (Asp), or glycine (Gly) inhibited the β-1-4-endoxylanase activity. Mutants having Asp-86 or Gln-177 also lost the ability to induce the hypersensitive response and ethylene biosynthesis. However, mutants having Gln-86, Gly-86, Asp-177, or Gly-177 retained ability to induce ethylene biosynthesis and the hypersensitive response. Our data show that the xylanase activity of EIX elicitor can be separated from the elicitation process, as some of the mutants lack the former but retain the latter.
Note:
Related Files :
Base Sequence
endoxylanase
Insecta
Molecular Sequence Data
mutation
Plants, Toxic
Sequence Homology, Amino Acid
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Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19512
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:29
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Scientific Publication
A point mutation in the ethylene-inducing xylanase elicitor inhibits the β-1-4-endoxylanase activity but not the elicitation activity
121
Furman-Matarasso, N., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Cohen, E., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Du, Q., Department of Entomology, Institute of Plant Protection, Volcani Center, Bet-Dagan 50250, Israel
Chejanovsky, N., Department of Entomology, Institute of Plant Protection, Volcani Center, Bet-Dagan 50250, Israel
Hanania, U., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
Avni, A., Department of Plant Sciences, Tel-Aviv University, Tel-Aviv 69978, Israel
A point mutation in the ethylene-inducing xylanase elicitor inhibits the β-1-4-endoxylanase activity but not the elicitation activity
Ethylene-inducing xylanase (EIX) elicits plant defense responses in certain tobacco (Nicotiana tabacum) and tomato cultivars in addition to its xylan degradation activity. It is not clear, however, whether elicitation occurs by cell wall fragments released by the enzymatic activity or by the xylanase protein interacting directly with the plant cells. We cloned the gene encoding EIX protein and overexpressed it in insect cells. To determine the relationship between the two activities, substitution of amino acids in the xylanase active site was performed. Substitution at glutamic acid-86 or -177 with glutamine (Gln), aspartic acid (Asp), or glycine (Gly) inhibited the β-1-4-endoxylanase activity. Mutants having Asp-86 or Gln-177 also lost the ability to induce the hypersensitive response and ethylene biosynthesis. However, mutants having Gln-86, Gly-86, Asp-177, or Gly-177 retained ability to induce ethylene biosynthesis and the hypersensitive response. Our data show that the xylanase activity of EIX elicitor can be separated from the elicitation process, as some of the mutants lack the former but retain the latter.
Scientific Publication
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