2010
DOI: 10.1016/j.pep.2009.09.003
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Engineering BspQI nicking enzymes and application of N.BspQI in DNA labeling and production of single-strand DNA

Abstract: BspQI is a thermostable Type IIS restriction endonuclease (REase) with the recognition sequence 5' GCTCTTC N1/N4 3'. Here we report the cloning and expression of the bspQIR gene for the BspQI restriction enzyme in E. coli. Alanine scanning of the BspQI charged residues identified a number of DNA nicking variants. After sampling combinations of different amino acid substitutions, an Nt.BspQI triple mutant (E172A/E248A/E255K) was constructed with predominantly top-strand DNA nicking activity. Furthermore, a trip… Show more

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Cited by 31 publications
(32 citation statements)
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“…26 Enzymes were removed by phenol:chloroform extraction and the template was recovered by ethanol precipitation; its concentration was then determined by measuring UV absorbance at 260 nm.…”
Section: Experimental Methodsmentioning
confidence: 99%
“…26 Enzymes were removed by phenol:chloroform extraction and the template was recovered by ethanol precipitation; its concentration was then determined by measuring UV absorbance at 260 nm.…”
Section: Experimental Methodsmentioning
confidence: 99%
“…1] the N-terminal 22 aa could be deleted without significantly affecting the nicking activity in Mg 2+ and Mn 2+ buffers; [2] the first 51-aa residues were not absolutely required for the nicking activity in Mn 2+ buffer, but the truncation mutant (76-aa peptide) displayed impaired nicking activity in Mg 2+ buffer (the nicking activity can be restored by fusion with a strong DNA binding element such as a zinc finger protein); [3] larger N-terminal deletion, i.e. deletion of 54-or 66-aa residues from the N-terminus completely inactivated the enzyme activity in Mg 2+ or Mn 2+ buffer.…”
Section: Nbis30 Nφgamma and Other Phage Or Prophage-encoded Hnhementioning
confidence: 99%
“…Nt.BspQI was applied to nicking site profiling in a proofof-concept experiment on a phage DNA (2). DNA optical mapping was applied to bacterial artificial chromosome (BAC) clones containing large human DNA inserts for de novo sequence assembly and for detection of structural variations in complex regions (95).…”
Section: Dna Optical Mappingmentioning
confidence: 99%
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