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Purification of the M flax-rust resistance protein expressed in Pichia pastoris.

Identifieur interne : 000139 ( Main/Exploration ); précédent : 000138; suivant : 000140

Purification of the M flax-rust resistance protein expressed in Pichia pastoris.

Auteurs : Simon A. Schmidt [Australie] ; Simon J. Williams ; Ching-I A. Wang ; Pradeep Sornaraj ; Ben James ; Bostjan Kobe ; Peter N. Dodds ; Jeffrey G. Ellis ; Peter A. Anderson

Source :

RBID : pubmed:17461785

Descripteurs français

English descriptors

Abstract

The M flax-rust resistance (R) gene is predicted to encode a 150-kDa protein of the Toll-interleukin-like receptor-nucleotide binding site-leucine rich repeat (TIR-NBS-LRR) class of plant disease resistance proteins and provides resistance against the Melampsora lini (flax rust) fungus carrying the AvrM avirulence gene. The extremely low level of this class of R proteins found in plant tissue has precluded their biochemical and structural analysis, and the study of these proteins has been largely restricted to genetic analyses and in vivo investigations. Here we report the production and purification of the M protein in the methalotrophic yeast, Pichia pastoris. Expression trials with five different constructs reveals optimum levels of soluble native M protein can be obtained as an N-terminally 9x His-tagged protein, in which the first 21 amino acids of the predicted wild-type protein are deleted. Expression was achieved using a high cell density fed-batch bioreactor culture at low temperature. M protein was purified to near homogeneity from whole-cell lysates using cation exchange, immobilised metal ion affinity chromatography and gel filtration with a final yield of approximately 3 mg of protein/1000 g wet weight of yeast cells lysed. The successful expression and purification of soluble M protein opens the way for biochemical and structural analysis of this class of important plant proteins.

DOI: 10.1111/j.1365-313X.2007.03104.x
PubMed: 17461785


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">The M flax-rust resistance (R) gene is predicted to encode a 150-kDa protein of the Toll-interleukin-like receptor-nucleotide binding site-leucine rich repeat (TIR-NBS-LRR) class of plant disease resistance proteins and provides resistance against the Melampsora lini (flax rust) fungus carrying the AvrM avirulence gene. The extremely low level of this class of R proteins found in plant tissue has precluded their biochemical and structural analysis, and the study of these proteins has been largely restricted to genetic analyses and in vivo investigations. Here we report the production and purification of the M protein in the methalotrophic yeast, Pichia pastoris. Expression trials with five different constructs reveals optimum levels of soluble native M protein can be obtained as an N-terminally 9x His-tagged protein, in which the first 21 amino acids of the predicted wild-type protein are deleted. Expression was achieved using a high cell density fed-batch bioreactor culture at low temperature. M protein was purified to near homogeneity from whole-cell lysates using cation exchange, immobilised metal ion affinity chromatography and gel filtration with a final yield of approximately 3 mg of protein/1000 g wet weight of yeast cells lysed. The successful expression and purification of soluble M protein opens the way for biochemical and structural analysis of this class of important plant proteins.</div>
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