Enhanced Lumazine Synthase (ELS) Expression Construct
Lumazine synthase (LS) from Aquifex aeolicus forms icosahedral microcompartment (MC) assemblies of 60 or 180 monomeric units that self assemble and are capable of isolating proteins from their local environment. As shown in previously published work (1), the LS protein has been mutated so that the interior of the MC is negatively charged; the UL 2009 iGEM team has submitted the mutated LS gene to the parts registry (BBa_K249002). A negatively charged interior allows for preferential compartmentalization of positively charged molecules, which can easily be engineered through the addition of a poly-arginine tag to a target protein (1). The size of the cavity of the enhanced Lumazine Synthase microcompartment was enlarged and the negative charge was increased via directed evolution (2). The compartment formed by this polypeptide has a larger cavity and a larger net negative charge, thus allowing a larger loading capacity into the cavity of the compartment.
Datasheet for Part BBa_K1210002.
(1) Seebeck, F., Woycechowsky, K., Zhuang, W., Rabe, J., and Hilvert, D. (2006). A simple tagging system for protein encapsulation. Journal of the American Chemical Society. 128: 4516-4517.
(2) Wörsdörfer, B., Woycechowsky, K.J., and Hilvert, D. (2011). Directed Evolution of a Protein Container. Science. 331: 589-592.
Sequence and Features
- 10COMPATIBLE WITH RFC
- 12COMPATIBLE WITH RFC
- 21Illegal BglII site found at 231
- 23COMPATIBLE WITH RFC
- 25COMPATIBLE WITH RFC
- 1000COMPATIBLE WITH RFC