Composite

Part:BBa_K3081057

Designed by: Song-Yuan Zhang   Group: iGEM19_Peking   (2019-10-16)

CRISPR-based replication interference system for p15A plasmid copy number control, ini(+) site

This composite part uses a CRISPR-based DNA replication interference system for the copy number control of the p15A plasmid. The dCas9 is expressed in an inducible manner with a ssrA degradation tag fused to its C-terminal to minimize the basal expression. The sgRNA has a 20-bp complementary sequence with the bottom strand (the strand that replication activator (RNA II) binds to) of initiation site (+1) on p15A origin. It can efficiently downregulate the plasmid copy number.

T--Peking--p15A_mechanism.png

Design of the p15A plasmid copy number control system

T--Peking--p15A_result.png

The effect of 4 target sites on p15A origin


Reference：

[1]Wolański M, Donczew R, Zawilakpawlik A, et al. oriC-encoded instructions for the initiation of bacterial chromosome replication.[J]. Frontiers in Microbiology, 2015, 5(735):735.


Sequence and Features


Assembly Compatibility:
  • 10
    COMPATIBLE WITH RFC[10]
  • 12
    INCOMPATIBLE WITH RFC[12]
    Illegal NheI site found at 1205
    Illegal NheI site found at 2321
    Illegal NheI site found at 5495
    Illegal NheI site found at 5518
  • 21
    INCOMPATIBLE WITH RFC[21]
    Illegal BamHI site found at 1144
    Illegal BamHI site found at 4600
  • 23
    COMPATIBLE WITH RFC[23]
  • 25
    INCOMPATIBLE WITH RFC[25]
    Illegal AgeI site found at 979
  • 1000
    INCOMPATIBLE WITH RFC[1000]
    Illegal SapI site found at 961
[edit]
Categories
Parameters
None