Latest revision as of 19:59, 13 December 2019

Wildtype PETase for Chlamydomonas reinhardtii (Phytobrick)

This basic part contains the coding sequence of the wildtype PETase (B3-B4). Combined with a promoter and a terminator, this level 0 construct/basic part mediates PET degradation ability. As this part contains the introns 1-3 of RBCS2, it perfectly matches the part BBa_K3002027 (pAR promoter A1-B2), resulting in a high expression (Eichler-Stahlberg et al., 2009). To detect or purify the target protein a tag of the Kaiser Collection like BBa_K3002010 (sp20 HA-tag), BBa_K3002017 (HA-tag), BBa_K3002018 (sp20 His-tag), BBa_K3002028 (His-tag) is recommended. A secretion signal (BBa_K3002007 (cCA), BBa_K3002008 (GLE) or BBa_K3002009 (ARS)) can be added, when using the part BBa_K3002003 (pAR promoter (A1-A3)) as a promoter.

The WT-PETase was expressed in C.reinhardtii and little secretion was shown with the secretion signal cCA in combination with the SP20 tag. Secretion in combination with the SP20 tag was detected. Compared to the Mut-PETase it has no point mutations. The WT-PETase is important to judge the effect of the point mutations in the Mut-PETase regarding their effect onto the efficiency of the enzyme.

Overview of different level 2 MoClo constructs. We designed 35 different level 2 constructs by using the modular cloning system (MoClo) and transformed these into Chlamydomonas reinhardtii. These constructs contain promoters (PPSAD, PAR, PTub2), terminators (PSADter, RPL23ter, Tub2ter), and the coding sequences for selection markers (aadA, Hygro), tags (HA, His, SP20-HA, SP20-His), secretion signals (cCA, ARS, GLE) and the enzymes MHETase, wild-type PETase (WT-PETase), mutated PETase (Mut-PETase) and the mutated PETase from the iGEM team TJUSLS China 2016 (Mutate M).

The Chlamy Yummy Project Collection

We are proud to present our MoClo part collection for C. reinhardtii - the Chlamy Yummy project collection.

These 67 parts are all parts used during our project and were specifically designed and codon optimized for Chlamydomonas. Among them are basic parts (L0) of a novel mutant of the PETase (BBa_K3002014), the wildtype PETase and MHETase as well as a variety of functional composite parts (L1+L2). Containing different tags as well as selection markers, this collection serves as a perfect base for plastic degradation projects with Chlamydomonas. These parts were tested and optimized thoroughly and we can guarantee that they work 100%. Because this is a MoClo collection, the parts are highly standardized for worldwide application. The combination with other part collections works fast and easy. While in MoClo, nomenclature is a bit different from the iGEM BioBricks, it is quickly explained:

Level 0 parts are equivalent to basic parts, e.g. Promoters, coding sequences, etc.

Level 1 parts are combinations of basic parts and usually form functional transcription units.

Level 2 parts are combinations of Level 1 parts, in case you want to transfer multiple transcription units at once. For example, you can pair your gene of interest with a selection marker.

The great thing about the Kaiser Collection and MoClo is that the ligation works in a one pot, one step reaction, as the Type IIs restriction enzymes cut out their own recognition sites. This way, multiple constructs can be combined linearly in a fixed order to create complex structures. This is ensured by the standardized overlaps that assign the parts one of 10 positions in the final constructs. After trying MoClo once, you won’t go back to traditional ligation. It is incredibly easy and reliable. Visit our parts site to get an overview over all parts.

Sequence and Features