FastDigest name change
FastDigest Poster

Recently Viewed

FastDigest BcuI

5'...AC T A G T...3'
3'...T G A T CA...5'

FastDigest buffer for 100% activity Optimal incubation at 37°C Not inactivated at 80°C in 20 min LO certified

The FastDigest BcuI restriction enzyme recognizes A^CTAGT sites and cuts best at 37°C in 5-15 minutes using universal FastDigest Buffer. This enzyme is an isoschizomer of SpeI having the same recognition and cleavage specificity (Isoschizomers: AhlI).
Lambda DNA digested with SpeI (BcuI)

pUC19 DNA/Psp1406I fragments with inserted BcuI recognition sites, 1.0% agarose, 1 cleavage site

Thermo Scientific FastDigest enzymes are an advanced line of fast restriction enzymes that are all 100% active in the universal FastDigest and FastDigest Green reaction buffers.

The universal buffer allows rapid single-, double- or multiple DNA digestion within 5-15 minutes eliminating any need for buffer change or subsequent DNA clean-up steps. DNA modifying enzymes, such as Klenow Fragment, T4 DNA Ligase, alkaline phosphatases and T4 DNA Polymerase all have 100% activity in FastDigest Buffer. Therefore, enzymes for downstream applications can be directly added to the FastDigest reaction mix.

For additional convenience FastDigest Green Buffer includes a density reagent and two tracking dyes for direct loading of digestion reaction products on gels.

Short incubation times and optimal composition of the universal FastDigest Buffer eliminate star activity effects.


  • 100% activity of all FastDigest enzymes in the universal buffer
  • 100% buffer compatibility with downstream applications
  • Complete digestion in 5-15 minutes
  • Direct loading on gels
  • No star activity
  • 176 FastDigest enzymes available


  • Molecular cloning
  • Restriction site mapping
  • Genotyping
  • Southern Blot
  • Restriction fragment length polymorphism (RFLP)
  • SNP analysis


The FastDigest Green Buffer offers the same high performance in DNA digestion and downstream applications as the colorless FastDigest Buffer. For applications that require product analysis by fluorescence excitation (e.g. concentration measurements in UV light) the colorless FastDigest Buffer is recommended.

For methylation sensitivity refer to product specifications.

Compatible Ends

CTGCAG - FastDigest Alw44I, Alw44I.

FastDigest XmaJI, FastDigest NheI, FastDigest Eco130I, FastDigest XbaI, AvrII, Eco130I, NheI, StyI, XbaI, XmaJI.

Formulation1 μL of enzyme (1 FDU) cleaves 1 μg of linearized pUC19 DNA with inserted BcuI recognition site in 5 minutes at 37°C in 1X FastDigest Buffer.
IsoschizomersSearch for commercial isoschizomers using REsearch.
Recommended Reaction Conditions

1X FastDigest buffer or 1X FastDigest Green buffer at 37°C.
1 μL of FastDigest BcuI is formulated to digest up to:

  • 1 µg of pUC19 DNA with insert containing SpeI recognition site in 5& minutes
  • 1 µg of plasmid DNA in 5 minutes
  • 0.2 µg of PCR product in 5 minutes
  • 1 µg of genomic DNA in 5 minutes or 5 µg of genomic DNA in 30 minutes
Shelf Life
Shipping Condition
Shipping Information
Storage Condition-20 C

Reaction conditions

Reaction temperature Digestion time with 1 μL of FastDigest enzyme, min bp from end of DNA required for complete digestion Thermal inactivation Incubation time without star activity, hours
Lambda, 1 µg/20 μL Plasmid DNA, 1 µg/20 μL PCR product, ~0.2 µg/30 μL Genomic DNA, 1 µg/10 μL
37°C no sites
(pUC19-SpeI DNA/Psp1406I,
5 min)
5 5 5 1 No
(chloroform extraction)

Methylation Effects

  • Dam: never overlaps - no effect.
  • Dcm: never overlaps - no effect.
  • CpG: never overlaps - no effect.
  • EcoKI: may overlap - effect not determined.
  • EcoBI: may overlap - effect not determined.

Number of recognition sites in DNA molecules

Lambda ΦX174 M13mp18/19 pBR322 puc18/19 pUC57
0 0 0 0 0 0
pTZ19R/U pTZ57R pBluescriptIIKS(±) pBluescriptIISK(±) pACYC177 pACYC184
0 0 1 1 0 0

New sites generated by ligation

Newly generated recognition sites resulting from ligation of protruding compatible DNA ends

Recognition Sequence Second Enzyme Enzymes recognizing newly generated recognition sequence
  • Eco130I (StyI)/FastDigest Eco130I* (C^CTAGG)
  • NheI/FastDigest NheI (G^CTAGC)
  • XbaI/FastDigest XbaI (T^CTAGA)
  • XmaJI (AvrII)/FastDigest XmaJI (C^CTAGG)
  • FspBI (BfaI)/FastDigest FspBI

Newly generated recognition sites resulting from fill-in of 5'-overhang and self-ligation

Recognition Sequence Newly generated sequence after reaction Enzymes that cleave the newly generated sequence
  • AluI/FastDigest AluI
  • CviJI
  • [FspBI (BfaI)/FastDigest FspBI]
  • SetI