Part:BBa_K3406005

6xHis/Twin-strep-SUMO-CcaCas13b

CcaCas13b is a member of Cas13 protein family.It has the common characteristic of Type VI RNA-targeting CRISPR–Cas system’s proteins, which means it could be actived by target RNA and could cleave bystander single strained RNAs. This feature could be used to target RNA and thus to detect RNA and to edit RNA. Besides,different Cas13 protein has different base cutting preference,and the preference of CcaCas13b is Poly U/UA/UC

Sequence and Features

Assembly Compatibility:

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

  Illegal BamHI site found at 144
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  INCOMPATIBLE WITH RFC[25]

  Illegal AgeI site found at 1436
  Illegal AgeI site found at 2288
  
• 1000
  COMPATIBLE WITH RFC[1000]

Expression and purification

Because CcaCas13b protein was codon optimized, it was expressed in E. coli BL21(DE3). And the expressed protein was purified by Ni-NTA purification.The result is shown below.

Figure 1 The agarose gel electrophoresis of CcaCas13b purification
Lane M：Protein Marker
Lane FT：Flow through liquid. After the cell lysate was incubated with Ni-NTA agarose
Lane 10：10 mM imidazole eluted protein flow through
Lane 50：50 mM imidazole eluted protein flow through
Lane 250-1 to 250-7：250 mM imidazole first to seventh eluted protein flow-through
Lane 500：500 mM imidazole eluted protein flow through