A1 Refereed original research article in a scientific journal
Enhanced error-prone RCA mutagenesis by concatemer resolution
Authors: Tuomas Huovinen, Marja Julin, Hanna Sanmark, Urpo Lamminmäki
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication year: 2011
Journal: Plasmid
Journal name in source: PLASMID
Journal acronym: PLASMID
Number in series: 1
Volume: 66
Issue: 1
First page : 47
Last page: 51
Number of pages: 5
ISSN: 0147-619X
DOI: https://doi.org/10.1016/j.plasmid.2011.03.004
Abstract
Error-prone rolling circle amplification (RCA) is a promising alternative to error-prone PCR for random mutagenesis. The main disadvantage of error-prone RCA is the low transformation efficiency of the DNA concatemer produced in the amplification reaction. We improved the method by introducing loxP recombination site of bacteriophage P1 Cre recombinase into the target plasmid and reducing the concatemer by Cre recombinase to plasmid-sized units, increasing the number of transformants 50-fold in non-error-prone and 13-fold in error-prone conditions. The efficiency improvement was verified by obtaining 115 57 ceftazidime resistant colonies per recombined RCA reaction from randomly mutated TEM-1 beta-lactamase gene library whereas only 9 +/- 11 colonies were gained without recombination. Supplementation of the error-prone RCA with Cre/loxP recombination is a simple and useful tool to increase the transformable library size. (C) 2011 Elsevier Inc. All rights reserved.
Error-prone rolling circle amplification (RCA) is a promising alternative to error-prone PCR for random mutagenesis. The main disadvantage of error-prone RCA is the low transformation efficiency of the DNA concatemer produced in the amplification reaction. We improved the method by introducing loxP recombination site of bacteriophage P1 Cre recombinase into the target plasmid and reducing the concatemer by Cre recombinase to plasmid-sized units, increasing the number of transformants 50-fold in non-error-prone and 13-fold in error-prone conditions. The efficiency improvement was verified by obtaining 115 57 ceftazidime resistant colonies per recombined RCA reaction from randomly mutated TEM-1 beta-lactamase gene library whereas only 9 +/- 11 colonies were gained without recombination. Supplementation of the error-prone RCA with Cre/loxP recombination is a simple and useful tool to increase the transformable library size. (C) 2011 Elsevier Inc. All rights reserved.
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