The amino acid 419 in HC-Pro is involved in the ability of PVY isolate N605 to induce necrotic symptoms on potato tubers.

Abstract

The ability to induce the potato tuber necrosis ringspot disease (PTNRD) is a property shared by PVY isolates belonging to different groups (e.g. PVY(N) and PVY(O)) and variants (e.g. PVY(NTN) and PVY(N)-W). The identification of viral molecular determinant(s) involved in the expression of PTNRD symptoms is essential for (i) an easier detection of tuber necrosis isolates and (ii) an improvement of our knowledge on the epidemiology of this potato disease. A reverse genetic approach associated with a biological typing of a collection of PVY chimeras and mutants indicated that residue E419 of the HC-Pro protein is linked to the ability of PVY to induce tuber necrosis on four PTNRD-susceptible potato cultivars. Indeed, the substitution of the N-type glutamic acid (E) in O-type aspartic acid (D) at position 419 in the HC-Pro cistron prevents the expression of tuber necrosis on infected tubers without reducing the virulence of the corresponding E/D419 mutant. This result opens opportunities for the future studies on potato/PVY interactions.

• Authors: Laurent Glais, Florence Faurez, Michel Tribodet, Frédéric Boulard, Emmanuel Jacquot
• Journal: Virus research (Virus Res) Vol. 208 Pg. 110-9 (Oct 02 2015) ISSN: 1872-7492 [Electronic] Netherlands
• PMID: 26071382 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 Elsevier B.V. All rights reserved.

Chemical References

• Viral Proteins
• Cysteine Endopeptidases
• HC-Pro protein, potyvirus

Topics

• Amino Acid Motifs
• Cysteine Endopeptidases (chemistry, genetics, metabolism)
• Plant Diseases (virology)
• Plant Tubers (virology)
• Potyvirus (chemistry, genetics, metabolism, pathogenicity)
• Solanum tuberosum (virology)
• Viral Proteins (chemistry, genetics, metabolism)
• Virulence