Measles virus protein interactions in yeast: new findings and caveats.
Complementary DNA clones of measles virus N, N (S228Q; L229D), Ncore (N1-400), Ntail (N401-525), P, PNT (P1-230), PCT (P231-507), L, MEL (L800-2183) and EL (L1300-2183) were fused in frame downstream of the Gal4 binding domain (BD) or activating domain (AD). All but BD-L, BD-MEL and BD-EL, were detected by western blot, with additional C- and/or N-terminal truncated products in the case of BD-N, and BD-P. BD-P and BD-PNT directly activated the reporter genes, indicating that the PNT domain displays transactivating properties. In yeast two-hybrid assays, PNT and PCT domains bind to Ncore and Ntail domains, respectively, indicating that N and P interact in a head to tail orientation via two independent binding sites. BD-N (S228Q; L229D) and AD-N displayed no or poor interaction with P proteins possibly because they may not be properly folded. L binding site on P lies within the PCT domain, and two PCT binding sites lie within the L1-799 and L800-1300 regions. Thus, N to P and P to L protein interactions in measles virus shared many features with other related Paramyxoviridae. From a human cDNA library, several candidate partners of N protein were identified which all reacted with BD-Ncore, and RNA was found to bridge the N protein with one partner.
Chen
M
M
Immunité et Infections Virales, CNRS-UCBL UMR5537, IFR 62 Laennec, 69372 Cedex 08, Lyon, France.
Cortay
J C
JC
Gerlier
D
D
D008459:Measles virus / Q000737:chemistry*; D009698:Nucleoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020798:Two-Hybrid System Techniques; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015003:Yeasts / Q000235:genetics / Q000378:metabolism / Q000821:virology*
D009698:Nucleoproteins; D014764:Viral Proteins