Toolyard

SfiI Recognition Site


SfiI at a glance

5' GGCCNNNN|NGGCC 3'
3' CCGGN|NNNNCCGG 5'
Recognition site5'-GGCCNNNNNGGCC-3'
CutGGCCNNNN^NGGCC
Endsa 3-base 3' overhang (NNN)
Expected frequencyabout once every 65,536 bp in random DNA

How to find SfiI sites in a sequence

  1. Paste a DNA sequence or FASTA record into the box above. SfiI is already entered under Only these enzymes.
  2. Tick Circular DNA for a plasmid, so a site that spans the end and the start is found.
  3. The map marks each SfiI cut with its position. Copy or download the output below it.

Frequently asked questions

What sequence does SfiI cut?

SfiI recognizes GGCCNNNNNGGCC (written 5' to 3') and cuts the top strand at GGCCNNNN^NGGCC.

Does SfiI leave sticky or blunt ends?

Sticky ends: a 3-base 3' overhang (NNN).

How often does SfiI cut?

A site like GGCCNNNNNGGCC turns up about once every 65,536 bp in random DNA. Real sequences vary, so check yours above.

Restriction enzymes

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