New data were obtained for the Solanum brevidens Fill. nucleotide sequences coding for polygalacturonase inhibitor proteins (PGIPs), which are involved in plant defense against phytopathogenic fungi. Highly degenerate primers directed to the conserved regions of the known PGIP genes of tomato, kiwi, apple, carrot, and grape were used to clone four pgip genes and one pseudogene from the genome of S. brevidens, a species that is closely related to cultivated potato, forms no tubers, is highly resistant to phytopathogens, and is often employed in potato breeding. The sequenced part of the coding region of the new genes is 924 bp and codes for a protein of 308 amino acid residues (without the leader peptide). The genes were designated as pgipSbr1(1), pgipSbr1(2), pgipSbr2, pgipSbr3, and pgipSbr4. The amino acid sequences of the S. brevidens PGIPs have 90.9–99.4% identity to each other and 94% identity to PGIP of Lycopersicon esculentum Mill., another member of the family Solanaceae. The amino acid residues differing between S. brevidens PGIPs were assumed to determine the selectivity of interactions with particular polyglucuronases of phytopathogenic fungi.
Russian Journal of Genetics – Springer Journals
Published: Apr 19, 2006
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