Structure and function of proteins controlling strain-specific pathogen resistance in plants

Area of Science:

• Plant pathology
• Molecular biology
• Genetics

Background:

• Structural and sequence similarities exist between plant disease resistance (R) proteins and animal proteins like Apaf-1 and CED-4.
• These similarities suggest conserved functional mechanisms in disease resistance pathways across kingdoms.

Purpose of the Study:

• To explore conceptual models for plant R protein function based on animal protein similarities.
• To investigate the role of specific motifs and genetic mechanisms in R gene diversity and specificity.

Main Methods:

• Comparative analysis of structural and amino acid sequences between plant R proteins and animal proteins.
• Extensive DNA sequencing of plant resistance gene families.

Main Results:

• The leucine-rich repeat motif is identified as a key determinant of gene-for-gene specificity in plant disease resistance.
• Intergenic DNA sequence exchange is confirmed as a significant mechanism contributing to the diversity of R genes.

Conclusions:

• Structural and functional parallels between plant R proteins and animal proteins provide valuable insights into resistance mechanisms.
• Leucine-rich repeats and DNA recombination are critical for maintaining and diversifying plant immune receptor genes.