F INDINGS National Institutes of Health National Institute of General Medical Sciences Viral Voyages Structural Biologist Mavis Agbandje-McKenna: Understanding.

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Presentation transcript:

F INDINGS National Institutes of Health National Institute of General Medical Sciences Viral Voyages Structural Biologist Mavis Agbandje-McKenna: Understanding Viruses

F INDINGS National Institutes of Health National Institute of General Medical Sciences Mavis Agbandje-McKenna Closes in on Viruses Structural biologist Agbandje-McKenna wants to solve the mysteries of how viruses hop from one host to another. Viruses Range from harmless to deadly Can change from harmless to deadly Need carbohydrates to enter cells Question: What is another name for carbohydrates?

F INDINGS National Institutes of Health National Institute of General Medical Sciences Answer: Glycans Carbohydrates: essential for many biological processes Cell communicationInflammationPregnancy

F INDINGS National Institutes of Health National Institute of General Medical Sciences Gripping Glycans Most cells have carbohydrates (glycans) on their outer surfaces Influenza A virus infects cells by attaching to glycans on host cells Influenza A virus infects a host cell Neuraminidase Hemagglutinin Glycan chain of host cell Protein Membrane of host cell

F INDINGS National Institutes of Health National Institute of General Medical Sciences Visualizing Viruses Outer layer (capsid protein) of MVM resembles 20-sided soccer ball MVM capsid protein contains cavity it uses to recognize and bind specific glycans 3-dimensional crystal structure showing surface of usually mild strain of minute virus of mice (MVMp)

F INDINGS National Institutes of Health National Institute of General Medical Sciences Unraveling Viral Mysteries Step-By-Step Make an observation Formulate a research question Formulate hypothesis Investigate Review known facts Draw conclusions from discoveries

F INDINGS National Institutes of Health National Institute of General Medical Sciences Solving Viral Mystery #1 Observation: MVMp-infected mice are suddenly dying. Research question: What made MVMp become deadly? Hypothesis: Genetic change created mutant capsid protein. Investigation: Decode genetic sequence of deadly MVMp and compare with normal MVMp genetic sequence. Known facts: Both strains of MVM are molecularly similar but have alterations in 14 of 587 amino acids that make up the virus’ protective capsid protein shell. Discoveries: 3 mutations, each causing a unique change in 1 amino acid in the capsid protein.

F INDINGS National Institutes of Health National Institute of General Medical Sciences Solving Viral Mystery #2 Observation: Mutated MVMp has 1 amino acid that differs from normal MVMp. Research question: What makes the mutation deadly? Hypothesis: Change is located in critical region of capsid shell. Investigation: Develop 3-D structure of MVM to identify locations of 3 mutant amino acids. Known facts: MVM capsid protein contains a cavity it uses to recognize and bind specific glycans so that the virus can enter and infect cells. Discoveries: At least 2 changed amino acids sit inside the capsid shell cavity.

F INDINGS National Institutes of Health National Institute of General Medical Sciences Poultry, People, and a Possible Pandemic H5N1 Largest and most lethal epidemic on record Migratory birds Spread virus Infect domestic birds Lethal strain of bird flu Constantly changing genetically Humans who handle infected birds can get virus What could happen if... H5N1 mutates into a strain that “jumps” the species barrier H5N1 is carried across continents by migratory birds ? H5N1 mutates in more ways in response to different environments ? H5N1 mutates into a strain that spreads more easily between people

F INDINGS National Institutes of Health National Institute of General Medical Sciences Glycobiology and Pandemics What is glycobiology? How might glycobiology help prevent a pandemic flu? What is the name of the technique shown in the picture?

F INDINGS National Institutes of Health National Institute of General Medical Sciences Research Applications In what ways might Agbandje-McKenna’s research about how viruses infect cells be applied to help patients with cancer?