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A chemotaxis cluster from Agrobacterium tumefaciens

E L Wright1, W J Deakin, C H Shaw

  • 1Department of Biological Sciences, University of Durham, South Road, Durham DH1 3LE, UK.

Gene
|October 10, 1998
PubMed
Summary

Researchers identified a new chemotaxis operon in Agrobacterium tumefaciens. This gene cluster is crucial for bacterial movement and communication, with key genes identified and their functions partially characterized.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Chemotaxis is essential for bacterial survival, enabling directed movement towards attractants or away from repellents.
  • Agrobacterium tumefaciens is a plant pathogen known for its genetic transformation capabilities, but its chemotaxis system is not fully understood.

Purpose of the Study:

  • To sequence and characterize a novel chemotaxis operon in Agrobacterium tumefaciens.
  • To identify the genes within the operon and their potential roles in chemotaxis.

Main Methods:

  • DNA sequencing of a 9.6-kb chromosomal region.
  • Bioinformatic analysis to identify open reading frames (ORFs) and predict protein functions.
  • Gene disruption (mutagenesis) to assess the functional impact of specific genes on chemotaxis.
  • PCR and heterologous probing to locate genes absent from the sequenced region.

Main Results:

  • A putative 8-kb chemotaxis operon was identified, containing genes homologous to known chemotaxis proteins (MCPs, CheY, CheA, CheR, CheB).
  • The operon's gene arrangement is conserved compared to other bacteria like Sinorhizobium meliloti and Rhodobacter sphaeroides.
  • Mutations in orf1 and cheA impaired chemotaxis, confirming their roles.
  • Deletion of orf10 did not affect chemotaxis or motility.
  • The cheW gene was located elsewhere in the genome, as it was absent from this operon.

Conclusions:

  • A novel chemotaxis operon in Agrobacterium tumefaciens has been characterized, providing insights into bacterial sensory mechanisms.
  • The identified genes, particularly orf1 and cheA, are essential for chemotaxis in this bacterium.
  • The absence of cheW within this operon suggests a unique genomic organization of chemotaxis genes in Agrobacterium tumefaciens.

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