Figure 1
The ana gene cluster responsible for the biosynthesis of anatoxin-a and homoanatoxin-a in cyanobacteria and the postulated biosynthetic route leading to these neurotoxins. KS, ketosynthase; AT, acyltransferase; KR, ketoreductase; DH, dehydratase; ER, enoylreductase; ACP, acyl carrier protein; Cy, cyclase; CM, methyltransferase. |