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Alfalfa mosaic virus replicase proteins P1 and P2 interact and colocalize at the vacuolar membrane

M W Van Der Heijden1, J E Carette, P J Reinhoud

  • 1Institute of Molecular Plant Sciences, Gorlaeus Laboratories, Leiden University, 2300 RA Leiden, The Netherlands.

Journal of Virology
|February 13, 2001
PubMed

Insights

Alfalfa mosaic virus RNA replication requires proteins P1 and P2, which interact and localize to the tonoplast membrane. This study identifies specific protein domains involved in their interaction and cellular localization during viral replication.

Area of Science:

  • Plant virology
  • Molecular biology
  • Cell biology

Background:

  • Alfalfa mosaic virus (AMV) RNA replication is mediated by viral proteins P1 and P2.
  • P1 possesses methyltransferase and helicase-like domains, while P2 contains a polymerase-like domain.

Purpose of the Study:

  • To investigate the interaction between AMV proteins P1 and P2.
  • To identify the domains responsible for the P1-P2 interaction.
  • To determine the cellular localization of P1 and P2 during viral replication.

Main Methods:

  • Coommunoprecipitation assays to detect protein interactions.
  • Yeast two-hybrid system with deletion analysis to map interaction domains.
  • Immunofluorescence microscopy in infected protoplasts to visualize protein localization.

Main Results:

  • Proteins P1 and P2 interact and are found in RNA-dependent RNA polymerase fractions.
  • The C-terminal helicase domain of P1 and the N-terminal region of P2 are crucial for interaction.
  • P1 and P2 colocalize at the tonoplast, a vacuolar membrane structure.

Conclusions:

  • AMV replication involves the interaction of P1 and P2, with specific domains mediating this association.
  • The tonoplast serves as a key cellular membrane for AMV replication complex assembly.
  • Different members of the Bromoviridae family may utilize distinct cellular membranes for replication complex formation.

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