Skip to main content
padlock icon - secure page this page is secure

Free Content IS903 transposase mutants that suppress defective inverted repeats

Download Article:
 Download
(PDF)
 
The inverted repeats (IRs) of the insertion element IS903 are composed of two functional regions. An inner region, consisting of basepairs 6–18, is the transposase binding site. The outer region (positions 1–3) is not contacted during initial transposase binding, but is essential for efficient transposition. We have examined the interaction of the IR with the transposase by isolating transposase suppressors of IR mutations. These suppressors define two patches within the N-terminus of the protein. One class of suppressors, which rescued the majority of outer IR mutants tested, contained mutations in close proximity to an aspartate residue (D121) believed to form part of the catalytic DDE motif, suggesting that their suppressive effect is in the positioning of the catalytic site at the terminus of the transposon. The hypertransposition phenotype of mutant VA119 is also consistent with this hypothesis. The second class was more allele specific and preferentially suppressed a mutation at position 3 of the IR. Finally, we showed that mutations at the termini of the IR elevate the frequency of cointegrate formation by IS903. Other outer IR mutations did not have this effect. These data are consistent with the terminal bases of the transposon playing multiple and distinct roles in transposition.
No References
No Citations
No Supplementary Data
No Article Media
No Metrics

Document Type: Research Article

Affiliations: Molecular Genetics Program, Wadsworth Center, New York State Department of Health and School of Public Health, State University of New York at Albany, David Axelrod Institute, 120 New Scotland Avenue, Albany, NY 12201-2002, USA.

Publication date: February 1, 1999

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more