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Eam1105I (AhdI)

5'...G A C N N NN N G T C...3'
3'...C T G N NN N N C A G...5'

Available as a FastDigest enzyme for rapid DNA digestion

FastDigest enzyme available Unique buffer for 100% activity Optimal incubation at 37°C Thermal inactivation at 65°C in 20 min Genome qualified LO certified

The Eam1105I (AhdI) restriction enzyme recognizes GACNNN^NNGTC sites and cuts best at 37°C in its own unique buffer (Isoschizomers: AhdI, AspEI, BmeRI, DriI, EclHKI)
Lambda DNA digested with Eam1105I (AhdI)

Lambda DNA digested with Eam1105I (AhdI), 0.7% agarose, 9 cleavage sites

Thermo Scientific conventional restriction endonucleases are a large collection of high quality restriction enzymes, optimized to work in one of the buffers of the Five Buffer System. In addition, the universal Tango buffer is provided for convenience in double digestions. All of the enzymes exhibit 100% activity in the recommended buffer and reaction conditions. To ensure consistent performance, Thermo Scientific restriction enzyme reaction buffers contain premixed BSA, which enhances the stability of many enzymes and binds contaminants that may be present in DNA preparations.


  • Superior quality – stringent quality control and industry leading manufacturing process
  • Convenient color-coded Five Buffer System
  • Includes universal Tango buffer for double-digestions
  • BSA premixed in reaction buffers
  • Wide selection of restriction endonuclease specificities


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


Low salt, high glycerol (> 5%) concentrations, pH > 8.0 or a large excess of enzyme may result in star activity.

For methylation sensitivity refer to product specifications.

Conditions for 100% Activity
  • 1X Buffer Eam1105I: 10 mM Tris-HCl (pH 7.5 at 37°C), 5 mM MgCl2, 100 mM NaCl, and 0.1 mg/mL BSA
  • Incubate at 37°C
Digestion of agarose-embedded DNAMinimum 5 units of the enzyme are required for complete digestion of 1 µg of agarose-embedded lambda DNA in 16 hours.
Double DigestionPerform double digestion using DoubleDigest.
IsoschizomersSearch for commercial isoschizomers using REsearch.
Storage BufferEam1105I is supplied in: 10 mM Tris-HCl (pH 7.4 at 25°C), 100 mM KCl, 1 mM DTT, 1 mM EDTA, 0.2 mg/mL BSA, and 50% (v/v) glycerol.
Storage Condition-20 C

Reaction conditions

Recommended buffer for 100% activity Optimal temperature Enzyme activity in Thermo Scientific buffers, % Tango buffer for double digestion
B (blue)
G (green)
O (orange)
R (red)
1X / 2X
Eam1105I Buffer [Unique] 37°C 20-50 50-100 0-20 0-20 50-100 20-50 1X or 2X

Methylation Effects

  • Dam: never overlaps - no effect.
  • Dcm: never overlaps - no effect.
  • CpG: may overlap - no effect.
  • EcoKI: never overlaps - no effect.
  • EcoBI: never overlaps - no effect.
Methylation type Sequence Cleavage effect
CpG 5'...GAm5C G(N)3m5C GTC...3'
3'...CT Gm5C(N)3 Gm5CAG...5'
No effect
CpG 5'...GAC(N)5GTm5C G...3'
3'...CTG(N)5CA Gm5C...5'
No effect
CpG 5'...m5C GAC(N)5GTm5C G...3'
3'... Gm5CTG(N)5CA Gm5C...5'
Not determined

Cleavage efficiency close to the termini of PCR fragments

bp from the recognition site to fragment end
1 2 3 4 5
0 50-100

Number of recognition sites in DNA molecules

Lambda ΦX174 M13mp18/19 pBR322 puc18/19 pUC57
9 1 0 1 1 1
pTZ19R/U pTZ57R pBluescriptIIKS(-/+) pBluescriptIISK(-/+) pACYC177 pACYC184
1 1 1 1 1 1

New sites generated by ligation

Newly generated recognition sites resulting from removal of 3'-overhang and self-ligation

Recognition Sequence Newly generated sequence after reaction Restriction enzymes that cleave the newly generated recognition sequence
  • BoxI (PshAI)/FastDigest PshAI (BoxI)