Part:BBa_T2013

Strep-tag II head domain (WSHPQFEK)

This is a Strep-tag II head domain designed to be at the N-terminus of a protein. Strep-tag II is typically used for detection, purification and immobilization of proteins.

Usage and Biology

Strep-tag II specifically binds to either core streptavidin or streptavidin variant StrepTactin. As the Strep-tag II binds reversibly to the same pocket of streptavidin where the natural ligand D-biotin is complexed, it can be used to purify corresponding fusion proteins on affinity columns with immobilized streptavidin.

The Strep-tag II has been engineered for use as either an N- or C-terminal tag; however; it has slightly reduced binding affinity relative to the Strep-tag to streptavidin. This shortcoming can be addressed at least in part by using the Strep-Tactin protein, a variant of Streptavidin, which has been engineered to have higher affinity for both the Strep-tag and Strep-tag II peptides. [See references for details.]

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]