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Life without Fe-S clusters.

Agostinho G Rocha1, Andrew Dancis1

  • 1Department of Medicine, Division of Hematology-Oncology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.

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|November 13, 2015
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Summary
This summary is machine-generated.

Scientists engineered E. coli to bypass iron-sulfur (Fe-S) cluster proteins by inserting the mevalonate pathway. This allows slow growth in double mutants lacking Fe-S cluster systems, questioning their essentiality.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Iron-sulfur (Fe-S) clusters are vital cofactors in E. coli, essential for numerous cellular processes like respiration and DNA repair.
  • The biosynthesis and maintenance of Fe-S clusters involve complex protein systems, traditionally considered indispensable.

Purpose of the Study:

  • To investigate if the essentiality of Fe-S cluster biosynthesis systems can be circumvented.
  • To explore the dispensability of Fe-S cluster proteins by reengineering metabolic pathways.

Main Methods:

  • Reengineering the isoprenoid biosynthetic pathway in E. coli by inserting the mevalonate pathway.
  • Creating double mutants (Δisc Δsuf) lacking key Fe-S cluster biosynthesis genes.
  • Supplementing mutants with mevalonate to bypass Fe-S cluster protein dependency.

Main Results:

  • Engineered E. coli strains could bypass the need for Fe-S cluster biosynthesis systems.
  • The Δisc Δsuf double mutants, when supplemented with mevalonate, exhibited slow growth.
  • Detectable Fe-S cluster proteins were absent in the growing double mutants.

Conclusions:

  • The study demonstrates that Fe-S cluster proteins are not universally indispensable for E. coli survival.
  • Metabolic reengineering can overcome the reliance on essential Fe-S cluster proteins.
  • This challenges our understanding of the fundamental roles of Fe-S clusters in cellular processes.