Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), National Institutes of Health/National Cancer Institute (NIH/NCI)
LuIII, a protoparvovirus pathogenic to rodents, replicates in human mitotic cells, making it applicable for use to kill cancer cells. This virus group includes H-1 parvovirus (H-1PV) and minute virus of mice (MVM). However, LuIII displays enhanced oncolysis compared to H-1PV and MVM, a phenotype mapped to the major capsid viral protein 2 (VP2). This suggests that within LuIII VP2 are determinants for improved tumor lysis. To investigate this, the structure of the LuIII virus-like-particle was determined using single particle cryo-electron microscopy and image reconstruction to 3.17 Å resolution, and compared to the H-1PV and MVM structures. The LuIII VP2 structure, ordered from residue 37 to 587 (C-terminal), had the conserved VP topology and capsid morphology previously reported for other protoparvoviruses. This includes a core β-barrel and α-helix A, a depression at the icosahedral 2-fold and surrounding the 5-fold axes, and a single protrusion at the 3-fold axes. Comparative analysis identified surface loop differences among LuIII, H-1PV, and MVM at or close to the capsid 2- and 5-fold symmetry axes, and the shoulder of the 3-fold protrusions. The 2-fold differences cluster near the previously identified MVM sialic acid receptor binding pocket, and revealed potential determinants of protoparvovirus tumor tropism.
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. nikea@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. nikea@ufl.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. adammisseldine@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. adammisseldine@ufl.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. lorenageilen@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. lorenageilen@ufl.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. halder.sujata@gmail.com.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. halder.sujata@gmail.com.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. jkennonsmith@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. jkennonsmith@ufl.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. justinkurian@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. justinkurian@ufl.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. pchipman@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. pchipman@ufl.edu.
Department of Chemistry and Biochemistry and Division of Biological Sciences, University of California-San Diego, San Diego, CA 92093, USA. mjanssen@nanoimagingservices.com.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. rmckenna@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. rmckenna@ufl.edu.
Department of Chemistry and Biochemistry and Division of Biological Sciences, University of California-San Diego, San Diego, CA 92093, USA. tsb@ucsd.edu.
Department of Laboratory Medicine, Yale University Medical School, New Haven, CT 06520, USA. anthony.dabramo@yale.edu.
Department of Laboratory Medicine, Yale University Medical School, New Haven, CT 06520, USA. susan.cotmore@yale.edu.
Department of Laboratory Medicine, Yale University Medical School, New Haven, CT 06520, USA. peter.tattersall@yale.edu.
Department of Genetics, Yale University Medical School, New Haven, CT 06510, USA. peter.tattersall@yale.edu.
Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32611, USA. mckenna@ufl.edu.
Center for Structural Biology, The McKnight Brain Institute, University of Florida, Gainesville, FL 32611, USA. mckenna@ufl.edu.
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