title: Self-association and mapping of interaction domains of helper component-proteinase of potato A potyvirus.
abstract: Potyviral helper component-proteinase (HC-Pro) is a multifunctional protein involved in aphid transmission, long-distance movement, polyprotein processing, genome amplification and symptom expression. It has been proposed that the active form of HC-Pro is a dimer and that coat protein (CP)-HC-Pro interaction is required for aphid transmission. To test these proposed interactions between CP and HC-Pro of potato A potyvirus (PVA), the yeast two-hybrid system was used. HC-Pro was shown to interact with itself in vivo in yeast cells, as did CP. Taken together with previous observations, we conclude that the functional HC-Pro is a homodimer. Deletion analysis showed that a 24 aa domain in the N-terminal half and the C-terminal proteinase part of HC-Pro were required for the interaction between HC-Pro molecules. No interactions were found between HC-Pro and CP using the genes of aphid-transmissible as well as aphid non-transmissible strains of PVA.
authors.forename: D
authors.initials: D
authors.lastname: Guo
authors.forename: A
authors.initials: A
authors.lastname: Merits
authors.forename: M
authors.initials: M
authors.lastname: Saarma
mesh_terms: D000818:Animals; D001042:Aphids / Q000821:virology; D015153:Blotting, Western; D002213:Capsid / Q000235:genetics / Q000378:metabolism*; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D007303:Insect Vectors / Q000821:virology; D017800:Potyvirus / Q000235:genetics* / Q000502:physiology*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D011198:Solanum tuberosum / Q000821:virology*; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D011993:Recombinant Fusion Proteins; D014764:Viral Proteins; D003546:Cysteine Endopeptidases; C072775:HC-Pro protein, potyvirus