title: Defining the minimal interacting regions of the tight junction protein MAGI-1 and HPV16 E6 oncoprotein for solution structure studies.
abstract: The oncoprotein E6 produced by tumorigenic high-risk genital human papillomaviruses targets a number of cellular proteins containing PDZ domains for proteasome-mediated degradation. In particular, E6 targets the tight junction protein MAGI-1 by binding to its PDZ1 domain. Using light scattering and NMR, we explored different fragments of both the HPV16 E6 and the MAGI-1 PDZ1 domain to define the best-behaving complex for solution structure studies. We showed that the 70-residue HPV16 E6 C-terminal domain (E6C) can be efficiently substituted by a peptide spanning the 11 C-terminal residues of E6. The construct of MAGI-1 PDZ1 best suited for solution structure analysis presents a 14-residue N-terminal extension and a 26-residue C-terminal extension as compared to the construct used for the recently solved X-ray structure of a MAGI-1 PDZ1/HPV18 E6 complex. These data suggest a stabilizing role for the interdomain linker regions which separate the PDZ1 domain from its neighboring domains.
authors.affiliation: Equipe Oncoprotéines, UMR CNRS 7175-LC1, Ecole Supérieure de Biotechnologie de Strasbourg, Boulevard Sébastien Brandt, BP 10413, 67412 Illkirch Cedex, France.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Charbonnier
authors.forename: Gunter
authors.initials: G
authors.lastname: Stier
authors.forename: Georges
authors.initials: G
authors.lastname: Orfanoudakis
authors.forename: Bruno
authors.initials: B
authors.lastname: Kieffer
authors.forename: R Andrew
authors.initials: RA
authors.lastname: Atkinson
authors.forename: Gilles
authors.initials: G
authors.lastname: Travé
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal / Q000737:chemistry / Q000378:metabolism*; D051528:Guanylate Kinases; D006801:Humans; D008969:Molecular Sequence Data; D009856:Oncogene Proteins, Viral / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D015815:Cell Adhesion Molecules; D015816:Cell Adhesion Molecules, Neuronal; C529089:E6 protein, human papillomavirus type 20; D009856:Oncogene Proteins, Viral; D051528:Guanylate Kinases; C113338:MAGI1 protein, human