Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac
The four salt bridges (Asp222-Arg28I, Arg233-Glu288, Arg234-Glu274, and Asp242-Arg265) linking domains I and II in Crv1Aa were abolished individually in x-helix 7 mutants D222A, R233A, R234A, and D242A. Two additional mutants targeting the fourth salt bridge (R265A) and the double mutant (D242A/R265A) were rapidly degraded during trypsin activation. Mutations were also introduced in the corresponding Cry1Ac salt bridge (D242E, D242K, D242N, and D242P), but only D242N and D242P could be produced. All toxins tested, except D242A, were shown by light-scattering experiments to permeabilize Manduca sexta larval midgut brush border membrane vesicles. The three active Cry1Aa mutants at pH 10.5, as well as D222A at pH 7.5, demonstrated a faster rate of pore formation than Cry1Aa, suggesting that increases in molecular flexibility due to the removal of a salt bridge facilitated toxin insertion into the membrane. However, all mutants were considerably less toxic to M. sexta larvae than to the respective parental toxins, suggesting that increased flexibility made the toxins more susceptible to proteolysis in the insect midgut. Interdomain salt bridges, especially the Asp242-Arg265 bridge, therefore contribute greatly to the stability of the protein in the larval midgut, whereas their role in intrinsic pore-forming ability is relatively less important.
Main Authors: | , , , , , , , , , , , |
---|---|
Format: | article biblioteca |
Language: | eng |
Subjects: | H10 - Ravageurs des plantes, Bacillus thuringiensis, toxine bactérienne, biopesticide, lutte anti-insecte, transfert de gène, Manduca sexta, http://aims.fao.org/aos/agrovoc/c_761, http://aims.fao.org/aos/agrovoc/c_9047, http://aims.fao.org/aos/agrovoc/c_27467, http://aims.fao.org/aos/agrovoc/c_3885, http://aims.fao.org/aos/agrovoc/c_24846, http://aims.fao.org/aos/agrovoc/c_30350, |
Online Access: | http://agritrop.cirad.fr/488238/ http://agritrop.cirad.fr/488238/1/488238.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-cirad-fr-488238 |
---|---|
record_format |
koha |
spelling |
dig-cirad-fr-4882382024-01-28T10:10:01Z http://agritrop.cirad.fr/488238/ http://agritrop.cirad.fr/488238/ Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac. Coux Florence, Vachon Vincent, Rang Cécile, Moozar Kouros, Masson Luke, Royer Monique, Bes Martine, Rivest Sébastien, Brousseau Roland, Schwartz Jean Louis, Laprade Raynald, Frutos Roger. 2001. Journal of Biological Chemistry, 276 (38) : 35546-35551.https://doi.org/10.1074/jbc.M101887200 <https://doi.org/10.1074/jbc.M101887200> Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac Coux, Florence Vachon, Vincent Rang, Cécile Moozar, Kouros Masson, Luke Royer, Monique Bes, Martine Rivest, Sébastien Brousseau, Roland Schwartz, Jean Louis Laprade, Raynald Frutos, Roger eng 2001 Journal of Biological Chemistry H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 The four salt bridges (Asp222-Arg28I, Arg233-Glu288, Arg234-Glu274, and Asp242-Arg265) linking domains I and II in Crv1Aa were abolished individually in x-helix 7 mutants D222A, R233A, R234A, and D242A. Two additional mutants targeting the fourth salt bridge (R265A) and the double mutant (D242A/R265A) were rapidly degraded during trypsin activation. Mutations were also introduced in the corresponding Cry1Ac salt bridge (D242E, D242K, D242N, and D242P), but only D242N and D242P could be produced. All toxins tested, except D242A, were shown by light-scattering experiments to permeabilize Manduca sexta larval midgut brush border membrane vesicles. The three active Cry1Aa mutants at pH 10.5, as well as D222A at pH 7.5, demonstrated a faster rate of pore formation than Cry1Aa, suggesting that increases in molecular flexibility due to the removal of a salt bridge facilitated toxin insertion into the membrane. However, all mutants were considerably less toxic to M. sexta larvae than to the respective parental toxins, suggesting that increased flexibility made the toxins more susceptible to proteolysis in the insect midgut. Interdomain salt bridges, especially the Asp242-Arg265 bridge, therefore contribute greatly to the stability of the protein in the larval midgut, whereas their role in intrinsic pore-forming ability is relatively less important. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/488238/1/488238.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1074/jbc.M101887200 10.1074/jbc.M101887200 http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=171058 info:eu-repo/semantics/altIdentifier/doi/10.1074/jbc.M101887200 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1074/jbc.M101887200 |
institution |
CIRAD FR |
collection |
DSpace |
country |
Francia |
countrycode |
FR |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-cirad-fr |
tag |
biblioteca |
region |
Europa del Oeste |
libraryname |
Biblioteca del CIRAD Francia |
language |
eng |
topic |
H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 |
spellingShingle |
H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 Coux, Florence Vachon, Vincent Rang, Cécile Moozar, Kouros Masson, Luke Royer, Monique Bes, Martine Rivest, Sébastien Brousseau, Roland Schwartz, Jean Louis Laprade, Raynald Frutos, Roger Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
description |
The four salt bridges (Asp222-Arg28I, Arg233-Glu288, Arg234-Glu274, and Asp242-Arg265) linking domains I and II in Crv1Aa were abolished individually in x-helix 7 mutants D222A, R233A, R234A, and D242A. Two additional mutants targeting the fourth salt bridge (R265A) and the double mutant (D242A/R265A) were rapidly degraded during trypsin activation. Mutations were also introduced in the corresponding Cry1Ac salt bridge (D242E, D242K, D242N, and D242P), but only D242N and D242P could be produced. All toxins tested, except D242A, were shown by light-scattering experiments to permeabilize Manduca sexta larval midgut brush border membrane vesicles. The three active Cry1Aa mutants at pH 10.5, as well as D222A at pH 7.5, demonstrated a faster rate of pore formation than Cry1Aa, suggesting that increases in molecular flexibility due to the removal of a salt bridge facilitated toxin insertion into the membrane. However, all mutants were considerably less toxic to M. sexta larvae than to the respective parental toxins, suggesting that increased flexibility made the toxins more susceptible to proteolysis in the insect midgut. Interdomain salt bridges, especially the Asp242-Arg265 bridge, therefore contribute greatly to the stability of the protein in the larval midgut, whereas their role in intrinsic pore-forming ability is relatively less important. |
format |
article |
topic_facet |
H10 - Ravageurs des plantes Bacillus thuringiensis toxine bactérienne biopesticide lutte anti-insecte transfert de gène Manduca sexta http://aims.fao.org/aos/agrovoc/c_761 http://aims.fao.org/aos/agrovoc/c_9047 http://aims.fao.org/aos/agrovoc/c_27467 http://aims.fao.org/aos/agrovoc/c_3885 http://aims.fao.org/aos/agrovoc/c_24846 http://aims.fao.org/aos/agrovoc/c_30350 |
author |
Coux, Florence Vachon, Vincent Rang, Cécile Moozar, Kouros Masson, Luke Royer, Monique Bes, Martine Rivest, Sébastien Brousseau, Roland Schwartz, Jean Louis Laprade, Raynald Frutos, Roger |
author_facet |
Coux, Florence Vachon, Vincent Rang, Cécile Moozar, Kouros Masson, Luke Royer, Monique Bes, Martine Rivest, Sébastien Brousseau, Roland Schwartz, Jean Louis Laprade, Raynald Frutos, Roger |
author_sort |
Coux, Florence |
title |
Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
title_short |
Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
title_full |
Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
title_fullStr |
Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
title_full_unstemmed |
Role of interdomain salt bridges in the pore-forming ability of the Bacillus thuringiensis toxins Cry1Aa and Cry1Ac |
title_sort |
role of interdomain salt bridges in the pore-forming ability of the bacillus thuringiensis toxins cry1aa and cry1ac |
url |
http://agritrop.cirad.fr/488238/ http://agritrop.cirad.fr/488238/1/488238.pdf |
work_keys_str_mv |
AT couxflorence roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT vachonvincent roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT rangcecile roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT moozarkouros roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT massonluke roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT royermonique roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT besmartine roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT rivestsebastien roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT brousseauroland roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT schwartzjeanlouis roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT lapraderaynald roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac AT frutosroger roleofinterdomainsaltbridgesintheporeformingabilityofthebacillusthuringiensistoxinscry1aaandcry1ac |
_version_ |
1792495194189332480 |