BioBrick Prefix/Suffix The Biobrick prefix and suffix was added to our gene so that they could be biobricked on to any biobrick plasmid with ease. Constitutive promoter with RBS Bert Berla, a graduate student adviser, helped us chose this promoter. It works well with synechocystis and contains a downstream RBS region that we use for our RBS regions. [http://www.ncbi.nlm.nih.gov/protein/75146812?report=genbank&log$=prottop&blast_rank=1&RID=Y1R3SV1R01S ZCD] This gene is from the organism Crocus sativus. This gene is only found in the Crocus species that produce this unique spice naturally. Thus this gene is certainly necessary. We put this gene first because it is the first enzyme to cleave zeaxanthin to crocin dialdehyde, the precursor to crocin (the primary pigment of Saffron), and hydroxy-beta-cyclocitral, the precursor to picrocin and safranal (a significant portion of the aroma of saffron). Since Crtz has an endogenous ortholog in Synechocystis, CrtR, we decided to put this gene last. [http://www.ncbi.nlm.nih.gov/protein/33114570?report=genbank&log$=prottop&blast_rank=1&RID=Y1RGDZF001S UGTCS2] This gene is also from Crocus sativus. We chose it for a similar reason to that of ZCD. This gene produces picrocin from hydroxy-beta-cyclocitral and crocin from crocin dialdehyde. Picrocin naturally degrades to saffranal. Thus this enzyme finishes the production of our desired compounds. [http://www.ncbi.nlm.nih.gov/protein/15235959?report=genbank&log$=prottop&blast_rank=1&RID=Y1RMH11X01S CrtZ]. CrtZ (β-carotene hydroxylase) makes zeaxanthin from β-carotene. We wanted to include this gene even though Synechocystis produces Zeaxanthin endogenously because we wanted to increase the amount of endogenously produced zeaxanthin produced so that we could produce more product. RBS, Restriction sites In between each gene we added Ribosome binding sites and restriction sites. The ribsome binding sites were necessary for the expression of our construct. The Restriction sites were added so that the genes could be easily cut out of the construct and manipulated. Terminator Our terminator was just a regular terminator we found on the parts registry. We optimized the construct for Synechocystis PCC 6803 using a program from DNA 2.0. We submitted the gene to DNA 2.0 to synthesize.
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