Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 324971
Title Rapid migration in gel filtration of the Cf-4 and Cf-9 resistance proteins is an intrinsic property of Cf proteins and not because of their association with high-molecular-weight proteins
Author(s) Hoorn, R.A.L. van der; Rivas, S.; Wulff, B.B.H.; Jones, J.D.G.; Joosten, M.H.A.J.
Source The Plant Journal 35 (2003). - ISSN 0960-7412 - p. 305 - 315.
Department(s) Laboratory of Phytopathology
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) transient expression system - membrane-associated complex - receptor-like kinase - cladosporium-fulvum - tomato - avr9 - binding - plants - recognition - suppression
Abstract Gel filtration is frequently used to study the behaviour and composition of protein complexes. In previous studies, gel filtration analysis of solubilised membranes containing the tomato Cf-4 and Cf-9 resistance proteins indicated that these Cf proteins are present in an approximately 400- and 420-kDa protein complex, respectively, which contains only one Cf molecule per complex, does not contain Rho-related proteins, and does not alter in size upon elicitation. Here, we show that inactive Cf-4 and Cf-9 mutant proteins have a similar large apparent size upon gel filtration analysis. The size remains unaltered after pre-treating the samples under harsh conditions, such as boiling with SDS and incubation in 6 M urea. A similar large apparent size was found for Cf-4 and Cf-9 isolated from SDS gel and for Cf-9 expressed by insect cells. Therefore, the large apparent size observed in our studies appears to be an intrinsic property of the Cf proteins, rather than being caused by association with high-molecular-weight protein(s). Taken together, these results suggest that caution should be taken when interpreting data obtained from gel filtration of LRR-containing proteins.
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