From Elizabeth Specht, Stephen Mayfield Lab, University of California-San Diego, May 2018

Vector: pBluescript

Origin: Created by seamless cloning of several different fragments; fully sequence-verified.

Insert: This construct contains two intact cassettes and one truncated cassette. The first intact cassette is the ARS2 coding sequence, driven by the chimeric HSP70-RBCS2 promoter and followed by its endogenous 3’ UTR; the CDS and 3’ UTR were amplified from cDNA harvested from a strain under sulfur starvation conditions. The second intact cassette is the ARG7 CDS, surrounded by its endogenous promoter/5’ UTR and 3’ UTR, which were amplified from genomic DNA of wild type CC1010 strain. The final, truncated cassette contains the 3’ half of the CDS of hygromycin resistance gene followed by the RBCS2 3’ UTR; upstream of this lies a 1.6kb intron that was amplified from CC1010 genomic DNA.

Total insert size is 9,093 bp.

Comment: This plasmid represents one half of the pair of plasmids designed to detect homologous recombination in C. reinhardtii. Upon recombination with its partner, pHR23, it will produce an intact, functional hygromycin resistance cassette. pHR18 is the plasmid that has been transformed into CC-1820 to create the strain B12.

Host strain: DH5α

Selection: Ampicillin resistant in E. coli; restores arginine prototrophy in arg7 Chlamydomonas mutants.

Sequence

From Elizabeth Specht, Stephen Mayfield Lab, University of California-San Diego, May 2018

Vector: pBluescript

Host strain: DH5a E. coli

Origin: Created by seamless cloning of several different fragments; fully sequence-verified.

Insert: This plasmid contains 4,360bp of homology to its complementing partner, pHR18, followed by one intact cassette for paromomycin resistance and one truncated cassette. The truncated cassette contains the 5’ half of the hygromycin resistance CDS, preceded by the beta-tubulin promoter and 5’ UTR, followed by a 1.6kb intron amplified from wild type strain CC-1010 genomic DNA.

Total insert size is 8,847 bp.

Comment: This plasmid represents one half of the pair of plasmids designed to detect homologous recombination in C. reinhardtii. Upon recombination with its partner, pHR18, it will produce an intact, functional hygromycin resistance cassette. pHR23 can be transformed directly into strain B12, which already harbors pHR18 in its genome, to screen for homologous recombination rate. Paromomycin resistance can be used to assess the ratio of recombinants to total transformation efficiency.

Host strain: DH5α

Selection: Ampicillin resistant in E. coli; paromomycin resistant in Chlamydomonas.

Sequence

From Kyle Lauersen, Olaf Kruse lab, Bielefeld University-Germany, May 2018

This is a minimized version of the pOpt2 vector which contains only a gene of interest cassette for reporter fusion to the aadA spectinomycin resistance gene. The vector has full complementarity to the pOpt2 vectors and contains the PsaD chloroplast targeting peptide between NdeI-BamHI. Fusion proteins can be generated for desired targets in fusion to the aadA and spectinomycin resistance allows direct selection for expressing transformants. This selection works whether fusion proteins are targeted to the algal chloroplast or the cytoplasm.

Host strain: DH5α
Selection in E. coli: ampicillin

Sequence


Wichmann J, Baier T, Wentnagel E, Lauersen KJ, Kruse O (2018) Tailored carbon partitioning for phototrophic production of (E)-α-bisabolene from the green microalga Chlamydomonas reinhardtii. Metab. Eng. 45:211–222

From Luke Mackinder, University of York-UK, December 2018

pLM017: pLM005-EPYC1-Venus-3xFLAG

Host strain: DH5α
Selection in E. coli: ampicillin
Selection in C. reinhardtii: paromomycin

Sequence


ackinder LC, Meyer MT, Mettler-Altmann T, Chen VK, Mitchell MC, Caspari O, Freeman Rosenzweig ES, Pallesen L, Reeves G, Itakura A, Roth R, Sommer F, Geimer S, Mühlhaus T, Schroda M, Goodenough U, Stitt M, Griffiths H, Jonikas MC (2016) A Repeat Protein Links Rubisco to Form the Eukaryotic Carbon-Concentrating Organelle. Proc Natl Acad Sci U S A. 113:5958–63

From Luke Mackinder, University of York-UK, December 2018

pLM035: pLM006-RBCS1-mCherry-6xHis

Host strain: DH5α
Selection in E. coli: ampicillin
Selection in C. reinhardtii: Hygromycin

Sequence


Mackinder LC, Meyer MT, Mettler-Altmann T, Chen VK, Mitchell MC, Caspari O, Freeman Rosenzweig ES, Pallesen L, Reeves G, Itakura A, Roth R, Sommer F, Geimer S, Mühlhaus T, Schroda M, Goodenough U, Stitt M, Griffiths H, Jonikas MC (2016) A Repeat Protein Links Rubisco to Form the Eukaryotic Carbon-Concentrating Organelle. Proc Natl Acad Sci U S A. 113:5958–63

From Paula Barjona, University of Erlangen-Nuremberg, December 2018

The constitutive promoter HSP70A/Rbcs2 in plasmid pBR9 was replaced by the PCR-amplified FEA1 inducible promoter from plasmid p5’Fea1-ARS2 yielding Fea1_Ble2A-mCherry.

Host strain: DH5α
Selection in E. coli: ampicillin

Sequence


Barjona do Nascimento Coutinho P, Friedl C, Buchholz R, Stute SC (2017) Chemical regulation of Fea1 driven transgene expression in Chlamydomonas reinhardtii. Algal Research. 26:323–329

Rasala BA, Barrera DJ, Ng J, Plucinak TM, Rosenberg JN, Weeks DP, Oyler GA, Peterson TC, Haerizadeh F, Mayfield SP (2013) Expanding the spectral palette of fluorescent proteins for the green microalga Chlamydomonas reinhardtii. Plant J. 74:545-56