Biology Reference
In-Depth Information
Figure 15:
Saxitoxin-producing species of dinofl agellates
Alexandrium pseudogonyaulax
(A) and
Gymnodinium aureolum
from
Scandinavian Culture Collection for Algae and Protozoa in different phases and views. Pictures courtesy Gert Hansen,
S
candinavian
C
ulture
C
ollection of Algae & Protozoa, Department of Biology, University of Copenhagen, Oester Farimagsgade
2D, DK-1353, Copenhagen, Denmark (http://www.sccap.dk/).
Color image of this figure appears in the color plate section at the end of the topic.
Structurally STXs are divided into two series, saxitoxins and neosaxitoxins. The difference in
between the two is that in the latter a hydroxyl group is added at N-1 position. In each of these
series the structural variants are synthesized by the presence and differential stereochemistry of
sulphate groups at C-1 and the occurrence of N-sulphate carbamoyl groups at C-17. The diversity
of PSTs produced by
L
.
wollei
appears to be greater than in any of the PST-producing cyanobacterial
