Meghan McLean Poon, Ph.D.

Meghan McLean Poon, Ph.D.

Palo Alto, California, United States
2K followers 500+ connections

About

I focus on patent preparation and prosecution, portfolio strategy, and IP due diligence…

Activity

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Experience

Education

  • USC Gould School of Law Graphic

    University of Southern California Law School

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    Activities: Mental Health Advocacy Services

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    Discovered novel protein-protein and protein-DNA interactions regulating site-specific recombination reactions. Presented work at international conferences in Europe and Asia. First place oral presentation, and second place poster presentation

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Volunteer Experience

  • Participant

    Team in Training

    - 6 months

    Health

    Raised money to benefit the Leukemia and Lymphoma Society and ran the Los Angeles Marathon.

Publications

  • Multiple interfaces between a serine recombinase and an enhancer control site-specific DNA inversion

    E. Life

    Serine recombinases are often tightly controlled by elaborate, topologically-defined, nucleoprotein complexes. Hin is a member of the DNA invertase subclass of serine recombinases that are regulated by a remote recombinational enhancer element containing two binding sites for the protein Fis. Two Hin dimers bound to specific recombination sites associate with the Fis-bound enhancer by DNA looping where they are remodeled into a synaptic tetramer competent for DNA chemistry and exchange. Here we…

    Serine recombinases are often tightly controlled by elaborate, topologically-defined, nucleoprotein complexes. Hin is a member of the DNA invertase subclass of serine recombinases that are regulated by a remote recombinational enhancer element containing two binding sites for the protein Fis. Two Hin dimers bound to specific recombination sites associate with the Fis-bound enhancer by DNA looping where they are remodeled into a synaptic tetramer competent for DNA chemistry and exchange. Here we show that the flexible beta-hairpin arms of the Fis dimers contact the DNA binding domain of one subunit of each Hin dimer. These contacts sandwich the Hin dimers to promote remodeling into the tetramer. A basic region on the Hin catalytic domain then contacts enhancer DNA to complete assembly of the active Hin tetramer. Our results reveal how the enhancer generates the recombination complex that specifies DNA inversion and regulates DNA exchange by the subunit rotation mechanism. - See more at: http://elifesciences.org/content/2/e01211#sthash.IR8sl6Mn.dpuf

    See publication
  • Recombining DNA by protein swivels

    Structure Journal

    Two new reports on serine recombinases, one of a crystal snapshot in an alternate rotational conformer poised for DNA cleavage (Keenholtz et al., 2011), and a second employing single-DNA molecule approaches (Bai et al., 2011), provide strong support for the subunit rotation model for exchanging DNA strands

    Other authors
    • Reid C. Johnson
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  • The Hin recombinase assembles a tetrameric protein swivel that exchanges DNA strands

    Nucleic Acids Research

    Most site-specific recombinases can be grouped into two structurally and mechanistically different classes. Whereas recombination by tyrosine recombinases proceeds with little movements by the proteins, serine recombinases exchange DNA strands by a mechanism requiring large quaternary rearrangements. Here we use site-directed crosslinking to investigate the conformational changes that accompany the formation of the synaptic complex and the exchange of DNA strands by the Hin serine recombinase…

    Most site-specific recombinases can be grouped into two structurally and mechanistically different classes. Whereas recombination by tyrosine recombinases proceeds with little movements by the proteins, serine recombinases exchange DNA strands by a mechanism requiring large quaternary rearrangements. Here we use site-directed crosslinking to investigate the conformational changes that accompany the formation of the synaptic complex and the exchange of DNA strands by the Hin serine recombinase. Efficient crosslinking between residues corresponding to the 'D-helix' region provides the first experimental evidence for interactions between synapsed subunits within this region and distinguishes between different tetrameric conformers that have been observed in crystal structures of related serine recombinases. Crosslinking profiles between cysteines introduced over the 35 residue E-helix region that constitutes most of the proposed rotating interface both support the long helical structure of the region and provide strong experimental support for a subunit rotation mechanism that mediates DNA exchange.

    Other authors
    • Gautham Dhar
    • John K. Heiss
    • Reid C. Johnson
    See publication

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