Part:BBa_K177009

lambda antirepressor cro

Cro repressor is a small dimeric protein which binds to specific sites on the DNA of bacteriophage lambda. Fragment of the phage DNA that is recognized by cro is known as cro-box. Recognition of specific DNA binding sites appears to occur via multiple hydrogen bonds between amino acid side chains of the protein and base pair atoms exposed within the major groove of DNA. Cro act as a transcription inhibitor which binds OR3, OR2 and OR1 sites.

One monomeric cro molecule interacting with cro-box sequence

Cluster of four monomers of cro

Typically a few monomers of cro are interacting with one cro-box sequence at the same time. At low concentrations blocks the pRM promoter preventing cI production. At high concentrations downregulates its own production through OR2 and OR1 binding

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BglII site found at 63
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]