sequence-dependent rate and pausing of individual lambda exonuclease enzymes during the digestion of a DNA sequence containing 120 CGG repeats. GC-rich repetitive sequences provide a significant barrier to lambda exonuclease activity by increasing the probability of pausing in addition to reducing the average digestion rate
for enzyme digestion of single DNA molecules, individual lambda-DNA molecules labeled with the fluorescent dye, YOYO-1, are stretched in a laminar flow stream and immobilized on a bare fused-silica prism surface based on hydrophobic and electrostatic interactions. Enzyme digestion is initiated by the influx of lambda-exonuclease enzyme via capillary force, method evaluation, overview. Progression of single-DNA digestion by lambda-exonuclease enzyme based on the decrease in the length of the DNA molecule at a dye:bp ratio of 1:5
the enzyme unwinds the DNA prior to cleavage, such that two nucleotides of the 5'-ended strand insert into the active site of one subunit of the trimer, while the 3'-ended strand passes through the central channel to emerge out the back of the trimer. Unwinding of the DNA is facilitated by several apolar residues, including Leu78, that wedge into the base pairs at the single/double-strand junction to form favorable hydrophobic interactions. The terminal 5' phosphate of the DNA binds to a positively charged pocket buried at the end of the active site, while the scissile phosphate bridges two active site Mg2+ ions, mechanism of progressivity, structure-activity analysis, overview
solid-phase digestion of dsDNAs using immobilization of lambda exonuclease onto poly(methylmethacrylate) micropillars populated within a microfluidic device for the on-chip digestion. The efficiency for the catalysis of dsDNA digestion using lamba-exonuclease, including its processivity and reaction rate, are higher when the enzyme is attached to a solid support compared to the free solution digestion. A clipping rate of 1000 nucleotides per s can be obtained for the digestion of lambda-DNA (48.5 kbp) by lambda-exonuclease
preparation of single-stranded DNA is an essential and important step in the combinatorial chemistry technique SELEX (Systematic Evolution of Ligands by EXponential enrichment) for in vitro selection of single-stranded DNA aptamers and numerous other molecular biology procedures, whereby single-stranded DNA generation by lambda exonuclease digestion is superior to other techniques. Important role for complete lambda exonuclease digestion of phosphorylated DNA strand plays the manufacturing of phosphorylated primer
a novel method for real-time monitoring of the activity and kinetics of T4 polynucleotide kinase (PNK) by use of a singly fluorophore-labeled DNA-hairpin smart probe (SP) coupled with lambda exonuclease (lambda exo) cleavage.
simple and homogeneous microRNA assay by integration of ligase chain reaction and lambda exonuclease-assisted cationic conjugated polymer biosensing. Ligase chain reaction is utilized for exponential amplification of microRNA, and lambda exonuclease is introduced to degrade excess fluorescein-labeled probes in ligase chain reaction for eliminating background signal. The method is sensitive enough to detect 0.1 fM target microRNA and specific to discriminate one-base difference of microRNAs