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Recognition of GT mismatches by Vsr mismatch endonuclease

Recognition of GT mismatches by Vsr mismatch endonuclease
Recognition of GT mismatches by Vsr mismatch endonuclease
The Vsr mismatch endonuclease recognises the sequence CTWGG (W = A or T) in which the underlined thymine is paired with guanine and nicks the DNA backbone on the 5?-side of the mispaired thymine. By using base analogues of G and T we have explored the functional groups on the mismatch pair which are recognised by the enzyme. Removal of the thymine 5-methyl group causes a 60% reduction in activity, while removing the 2-amino group of guanine reduces cleavage by 90%. Placing 2-amino­purine or nebularine opposite T generates mis­matches which are cut at a much lower rate (0.1%). When either base is removed, generating a pseudoabasic site (1?,2?-dideoxyribose), the enzyme still produces site-specific cleavage, but at only 1% of the original rate. Although TT and CT mismatches at this position are cleaved at a low rate (~1%), mismatches with other bases (such as GA and AC) and Watson–Crick base pairs are not cleaved by the enzyme. There is also no cleavage when the mismatched T is replaced with difluorotoluene.
escherichia-coli k-12, short patch repair, cytosine methylation, crystal-structure, dna duplex, gene, 5-methyl-cytosine, difluorotoluene, cleavage, adenine
0305-1048
2535-2540
Fox, K.R.
9da5debc-4e45-473e-ab8c-550d1104659f
Allinson, S.L.
dc35efa2-6bfe-41b6-a89f-812f7070e151
Sahagun-Krause, H.
d7ca266c-61f0-4864-8b86-6aa2e731275b
Brown, T.
a64aae36-bb30-42df-88a2-11be394e8c89
Fox, K.R.
9da5debc-4e45-473e-ab8c-550d1104659f
Allinson, S.L.
dc35efa2-6bfe-41b6-a89f-812f7070e151
Sahagun-Krause, H.
d7ca266c-61f0-4864-8b86-6aa2e731275b
Brown, T.
a64aae36-bb30-42df-88a2-11be394e8c89

Fox, K.R., Allinson, S.L., Sahagun-Krause, H. and Brown, T. (2000) Recognition of GT mismatches by Vsr mismatch endonuclease. Nucleic Acids Research, 28 (13), 2535-2540. (doi:10.1093/nar/28.13.2535).

Record type: Article

Abstract

The Vsr mismatch endonuclease recognises the sequence CTWGG (W = A or T) in which the underlined thymine is paired with guanine and nicks the DNA backbone on the 5?-side of the mispaired thymine. By using base analogues of G and T we have explored the functional groups on the mismatch pair which are recognised by the enzyme. Removal of the thymine 5-methyl group causes a 60% reduction in activity, while removing the 2-amino group of guanine reduces cleavage by 90%. Placing 2-amino­purine or nebularine opposite T generates mis­matches which are cut at a much lower rate (0.1%). When either base is removed, generating a pseudoabasic site (1?,2?-dideoxyribose), the enzyme still produces site-specific cleavage, but at only 1% of the original rate. Although TT and CT mismatches at this position are cleaved at a low rate (~1%), mismatches with other bases (such as GA and AC) and Watson–Crick base pairs are not cleaved by the enzyme. There is also no cleavage when the mismatched T is replaced with difluorotoluene.

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More information

Published date: 1 July 2000
Keywords: escherichia-coli k-12, short patch repair, cytosine methylation, crystal-structure, dna duplex, gene, 5-methyl-cytosine, difluorotoluene, cleavage, adenine

Identifiers

Local EPrints ID: 18926
URI: http://eprints.soton.ac.uk/id/eprint/18926
ISSN: 0305-1048
PURE UUID: b968ee00-4197-4730-94e5-7b28c815f88b
ORCID for K.R. Fox: ORCID iD orcid.org/0000-0002-2925-7315

Catalogue record

Date deposited: 19 Jan 2006
Last modified: 16 Mar 2024 02:36

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Contributors

Author: K.R. Fox ORCID iD
Author: S.L. Allinson
Author: H. Sahagun-Krause
Author: T. Brown

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