Difference between revisions of "Part:BBa K4275010"

Revision as of 10:02, 12 October 2022

MHETase-t

MHETase-t is a dockerin-fused variant of free MHETase (BBa_K4275009). The enzyme shares all the common sequences in the CDS with the former, except the C' terminal fusion of a type-I dockerin domain in this enzyme. The catalytic domain of MHETase-t and the dockerin domain are interspaced with a medium-lengthed flexible GS linker (10 aa long) to avoid steric inhibitions. The type-I dockerin domain forms high-affinity non-covalent interaction with type-I cohesins on the cipA scaffoldin.

Figure 1 The 3D structure of the protein predicted by Alphafold2.

Usage and Biology

The artificially-designed MHETase - Dockerin I fusion protein could be tightly-anchored onto the CipA scaffoldin via the high-affinity Doc I: Coh I noncovalent interaction. The CipA primary scaffoldin is then tightly-anchored onto the secondary scaffoldin - OlpB, which is either anchored onto the cell surface of K. marxianus via ScGPI, or binds to E.coli's Cell-surface Nanobody3(Nb3)(BBa_K4275026). It is believed that the immobilization of the two enzymes (PETase-5-dockerin(BBa_K4275011) and MHETase-t) could increase their proximity and further enhance their synergy, whilst the affinity of carbohydrate-binding module 3 (CBM3) on the CipA scaffoldin towards PET fiber could further increase the catalytic efficiency of this degradation complex.

Sequence and Features

References

1. Knott, Brandon C. et al. "Characterization And Engineering Of A Two-Enzyme System For Plastics Depolymerization". Proceedings Of The National Academy Of Sciences, vol 117, no. 41, 2020, pp. 25476-25485. Proceedings Of The National Academy Of Sciences, https://doi.org/10.1073/pnas.2006753117.