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Updated: Jan 19, 2026

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The Way It Was.

M J Osborn1

  • 1Department of Molecular Biology and Biophysics, University of Connecticut Health Center, Farmington, Connecticut 06032, USA;

Annual Review of Microbiology
|September 11, 2019
PubMed
Summary
This summary is machine-generated.

Pioneering microbiologist Mary Osborn elucidated the mechanism of methotrexate action and made seminal contributions to understanding bacterial lipopolysaccharide (LPS) biosynthesis and cell envelope assembly.

Keywords:
O-antigenautobiographyendotoxinlipopolysaccharidemembrane

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Mary Osborn's early work revealed the mechanism of action for methotrexate, a crucial drug in cancer chemotherapy, by studying folic acid coenzymes in one-carbon metabolism.
  • Her foundational research career was established at New York University (NYU) and Albert Einstein College of Medicine, focusing on microbiology and molecular biology.
  • She was a founding faculty member at the University of Connecticut School of Medicine, where she continued her research until her retirement.

Discussion:

  • Dr. Osborn's primary research focused on the biosynthesis of lipopolysaccharide (LPS), a critical component of the outer membrane of gram-negative bacteria.
  • She also made significant contributions to understanding the complex processes involved in bacterial cell envelope assembly.
  • Her work provided fundamental insights into the structure and function of bacterial outer membranes.

Key Insights:

  • Elucidated the mechanism of action of methotrexate through studies on folic acid metabolism.
  • Made seminal contributions to the field of lipopolysaccharide (LPS) biosynthesis in gram-negative bacteria.
  • Advanced the understanding of bacterial cell envelope assembly and structure.

Outlook:

  • Her later career included advising NASA on space biology research, influencing the direction of space exploration science.
  • Dr. Osborn's legacy includes her impactful research and leadership in scientific organizations and advisory roles.