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Author Wulff, B. B. ♦ Thomas, C. M. ♦ Smoker, M. ♦ Grant, M. ♦ Jones, J. D.
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher American Society of Plant Biologists
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Computer science, information & general works ♦ Library & information sciences ♦ Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Genetics and evolution ♦ Natural history of organisms ♦ Microorganisms, fungi & algae ♦ Technology ♦ Medicine & health ♦ Human physiology ♦ Pharmacology and therapeutics
Subject Domain (in MeSH) Eukaryota ♦ Organisms ♦ Amino Acids, Peptides, and Proteins ♦ Nucleic Acids, Nucleotides, and Nucleosides ♦ Chemicals and Drugs ♦ Chemical Phenomena ♦ Genetic Phenomena ♦ Microbiological Phenomena ♦ Plant Physiological Phenomena ♦ Biological Sciences ♦ Information Science ♦ Information Science
Subject Keyword Discipline Botany ♦ Cladosporium ♦ Pathogenicity ♦ Genes, Plant ♦ Lycopersicon Esculentum ♦ Genetics ♦ Microbiology ♦ Membrane Glycoproteins ♦ Plant Proteins ♦ Amino Acid Sequence ♦ Base Sequence ♦ Dna, Plant ♦ Fungal Proteins ♦ Gene Dosage ♦ Genes, Fungal ♦ Physiology ♦ Chemistry ♦ Molecular Sequence Data ♦ Plant Diseases ♦ Plants, Genetically Modified ♦ Protein Structure, Tertiary ♦ Recombinant Fusion Proteins ♦ Repetitive Sequences, Amino Acid ♦ Sequence Homology, Amino Acid ♦ Virulence ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract The tomato Cf-4 and Cf-9 genes confer resistance to infection by the biotrophic leaf mold pathogen Cladosporium. Their protein products induce a hypersensitive response (HR) upon recognition of the fungus-encoded Avr4 and Avr9 peptides. Cf-4 and Cf-9 share >91% sequence identity and are distinguished by sequences in their N-terminal domains A and B, their N-terminal leucine-rich repeats (LRRs) in domain C1, and their LRR copy number (25 and 27 LRRs, respectively). Analysis of Cf-4/Cf-9 chimeras, using several different bioassays, has identified sequences in Cf-4 and Cf-9 that are required for the Avr-dependent HR in tobacco and tomato. A 10-amino acid deletion within Cf-4 domain B relative to Cf-9 was required for full Avr4-dependent induction of an HR in most chimeras analyzed. Additional sequences required for Cf-4 function are located in LRRs 11 and 12, a region that contains only eight of the 67 amino acids that distinguish it from Cf-9. One chimera, with 25 LRRs that retained LRR 11 of Cf-4, induced an attenuated Avr4-dependent HR. The substitution of Cf-9 N-terminal LRRs 1 to 9 with the corresponding sequences from Cf-4 resulted in attenuation of the Avr9-induced HR, as did substitution of amino acid A433 in LRR 15. The amino acids L457 and K511 in Cf-9 LRRs 16 and 18 are essential for induction of the Avr9-dependent HR. Therefore, important sequence determinants of Cf-9 function are located in LRRs 10 to 18. This region contains 15 of the 67 amino acids that distinguish it from Cf-4, in addition to two extra LRRs. Our results demonstrate that sequence variation within the central LRRs of domain C1 and variation in LRR copy number in Cf-4 and Cf-9 play a major role in determining recognition specificity in these proteins.
Description Country affiliation: United kingdom
Author Affiliation: Wulff BB ( Sainsbury Laboratory, John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, United Kingdom.)
ISSN 10404651
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2001-02-01
Publisher Place United States
e-ISSN 1531298X
Volume Number 13
Issue Number 2

Source: WHO-Global Index Medicus