Designed by: Yeqing Zong   Group: iGEM19_GENAS_China   (2019-10-14)

Integrase Int8

This is a serine-type phage (LSTP) integrases. The original organism is the Staphylococcus haemolyticus JCSC1435. The product protein of this part can catalyze the recombination between the corresponding attB and attP site (see part BBa_K3254003)

Orthogonality Characterization

We conducted orthogonality tests to see the compatibility between the 6 integrase used in our project. The other integrases include phiC31, Int5, Int7, Int10 and TG1.

Genetic design

The composition and principle of the experimental system are indicated below. More sequence details can be seen on the pages of BBa_K3254011 and BBa_K3254003.

The composition and principle of the experimental system

Experimental Setup

The plasmid containing the Int5 expressive unit was co-transferred into E.coli DH5α host with 6 reporter plasmids containing different attP-attB sites sequences. Then single colonies were inoculated into M9 supplemented medium for overnight growth. Then, the cell cultures were diluted 1000-fold with M9 supplemented medium (leakage expression is enough) and growth for another 20 hours. All incubation were carried out using a Digital Thermostatic Shaker maintained at 37 °C and 1000 rpm, using flat-bottom 96-well plates sealed with sealing film. Finally, the cultures were sampled for genotype PCR testing. The principle of genotype identification was shown on the right of results image.

  • M9 medium (supplemented): 6.8 g/L Na2HPO4, 3 g/L KH2PO4, 0.5 g/L NaCl, 1 g/L NH4Cl, 0.34 g/L thiamine, 0.2% casamino acids, 0.4% glucose, 2 mM MgSO4, and 100 μM CaCl2.


The results indicate that Int8 integrase has a good orthogonality with the other 5 att sites and compatible with other integrases. IBR-C35/F55/S37/E21/T25/G22 were the plasmids with phiC31/Int5/Int7/Int8/Int10/TG1 att sites.

T--GENAS China--orthogonality test.png

Sequence and Features BBa_K3254008 Sequence And Features Not understood