Fig. 1From: Identification of promoter elements in the Dolichospermum circinale AWQC131C saxitoxin gene cluster and the experimental analysis of their use for heterologous expressionTranscriptional analysis of the D. circinale AWQC131C sxt cluster. Genes required for PST biosynthesis are transcribed by a minimum of four mRNA transcripts from two bi-directional promoter regions encoding five promoters; PsxtD (operon 1), PsxtP (operon 2), PsxtPER1 (TU 3), PsxtPER2 (TU 3) and Porf24 (operon 4). Direction of transcription is indicated by black arrowsBack to article page