After PCR amplification, the products were digested with KpnI/EcoRI (promoter fragments B-E) or KpnI/MunI (promoter fragments A and PprbcL) and subcloned

upstream the gfp gene into a Shrimp Alkaline Phosphatase (SAP) treated, KpnI/EcoRI digested, pSUN202 to give plasmid pA-gfp to pE-gfp, pPprbcL-gfp. The vector pSUN202 was kindly provided by Professor Michael Summers, California this website State University, Northridge, US. All enzymes used were from Fermentas and the ligations were made using Quick ligase (NEB). Correct cloning of all promoter fragments to pSUN202 were confirmed by sequencing using pSUN202 seq forward and pSUN202 seq reverse primer (Table 1). Both primers anneal to sites HSP inhibitor present within the original vector, pSUN202. Construction of the hupSL promoter deletions fused to luxAB To ensure correct orientation of the PCR generated promoter fragments when cloned into the self replicable, luxAB containing vector pLR1 (Pia Lindberg, unpublished) (Table 1) restriction sites were included in the primers. An EcoRI or a MunI site was added to the 5′ end of the forward primers (B-E lux forward and PprbcL lux forward respectively), and a KpnI site to the 5′ end of the reverse primer (PhupS lux reverse, PprbcL lux reverse) (Table

1). Primer A lux forward did not contain any restrictions site. Instead an intrinsic MunI site in the resulting PCR product, (using A lux forward and PhupS lux reverse) Cyclin-dependent kinase 3 was used for further cloning. After PCR amplification, the products were digested with EcoRI/KpnI (promoter fragments B-E) or MunI/KpnI (promoter fragments A, PprbcL lux) and subcloned upstream luxAB into a SAP treated KpnI/EcoRI digested pLR1 to give plasmids pA-lux to pE-lux and pPprbcL-lux. All enzymes used were from Fermentas and the ligations were made using Quick ligase (NEB). Correct cloning for all plasmids were confirmed by sequencing, using pLR1 seq forward and reverse primer (Table 1). Both primers anneal to sites present within the original vector, pLR1. Transformation of N. punctiforme cells and selection of positive clones 500 ml cell culture

were harvested 3 days after inoculation and concentrated by centrifugation. The filaments were broken by sonication (Vibra cell VC 130, Tucidinostat price Sonics,) for 3 × 30 s (1 pulse/s, 20 kHz) to generate a culture with more single cells to allow for better segregation and selection of positive clones. The cell suspension was kept on ice for 30 s between the intervals. Chlorophyll a was extracted with 90% methanol and absorbance read against 665 nm using a Cary Win UV (Varian). The concentration of Chlorophyll a was determined using the extinction coefficient of 78.74 l g-1cm-1 [48]. The vector constructs (pA-E, p1–5, pPprbcL-gfp and pPprbcL-lux) were transferred to N. punctiforme by electroporation. Overnight cultures of sonicated N.