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Structural relationship between the vancomycin resistance protein VanH and 2-hydroxycarboxylic acid dehydrogenases
M Arthur1, C Molinas, S Dutka-Malen
1Unité des Agents Antibactériens, Institut Pasteur, Paris, France.
Gene
|July 15, 1991
Summary
Researchers identified a new protein, VanH, involved in vancomycin (Vm) resistance in enterococci. VanH may alter peptidoglycan precursors, reducing Vm
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Enterococcal plasmid pIP816 confers vancomycin (Vm) resistance.
- The vanA gene is crucial for Vm resistance.
- Understanding resistance mechanisms is vital for combating infections.
Purpose of the Study:
- To investigate genetic elements upstream of the vanA gene.
- To identify novel proteins involved in Vm resistance.
- To elucidate the function of the VanH protein.
Main Methods:
- DNA sequencing of enterococcal plasmid pIP816.
- Open reading frame (ORF) analysis.
- Amino acid (aa) similarity comparison with known proteins.
Main Results:
- An ORF coding for a 322 aa protein, VanH, was identified upstream of vanA.
- VanH shows extensive aa similarity to 2-hydroxycarboxylic acid dehydrogenase.
- This suggests a potential role for VanH in Vm resistance.
Conclusions:
- VanH is a newly identified protein potentially involved in vancomycin resistance.
- VanH may synthesize novel peptidoglycan precursors with reduced Vm affinity.
- Further studies are needed to confirm VanH's role in Vm resistance.