GENOMES - Cyanobacteria - page 106

Table 7: Distribution of types and number of fatty acid desaturase genes in some cyanobacteria (modifi ed after Chi et al .,
2008).

Sr. No. Name of strain Types of fatty acid desaturases No. of copies Total no.

1. Anabaena sp. PCC 7120 Δ9, Δ12, Δ15 Δ9-two genes 4

2. A . variabilis ATCC 29413 Δ9, Δ12, Δ15 Δ9-two genes 4

3. C . watsonii WH8501 Δ9, Δ12, Δ15 Δ12-two genes 4

4. G . violaceus PCC 7421 Δ9, Δ12 Δ9-six genes;

Δ12-two genes

8

5. N . punctiforme ATCC 29133

(PCC73102)

Δ9, Δ12, Δ15 Δ9-two genes 4

6. P . marinus NATL1A Δ9, Δ12 One gene each 2

7. P . marinus NATL2A Δ9, Δ12 One gene each 2

8. P . marinus MIT9211 Δ9, Δ12 Δ12-two copies 3

9. P . marinus MIT9301 Δ9, Δ12 Δ9-two genes 4

10. P . marinus MIT9303 Δ9, Δ12 Δ9-two genes 4

11. P . marinus MIT9312 Δ9, Δ12 Δ12-two genes 3

12. P . marinus MIT9313 Δ9, Δ12 One gene each 2

13. P . marinus AS9601 Δ9, Δ12 Δ12-two genes 3

14. P . marinus MIT9515 Δ9, Δ12 One gene each 2

15. P . marinus subsp. marinus

CCMP1375 (SS120)

Δ9, Δ12 Δ12-two genes 3

16. P . marinus subsp. marinus

CCMP1375 (MED4)

Δ9, Δ12 Δ12-two genes 3

17. S . elongatus PCC 7942 Δ9 One gene 1

18. S . elongatus PCC 6301 Δ9 One gene 1

19. Synechococcus sp. BL107 Δ9, Δ12 Δ9-two genes 3

20. Synechococcus sp.CC9311 Δ9, Δ12 Δ9-two genes 3

21. Synechococcus sp.CC9605 Δ9, Δ12 One gene each 2

22. Synechococcus sp.CC9902 Δ9, Δ12 Δ9-two genes 3

Synechococcus sp. JA-2-3B'a(2-13)

23. Δ9 One gene 1

24. Synechococcus sp. JA-3-3A'b Δ9 One gene 1

25. Synechococcus sp . RCC307 Δ9, Δ12 Δ9-two genes 3

26. Synechococcus sp. RS9916 Δ9 Δ9-two genes 2

27. Synechococcus sp. RS9917 Δ9, Δ12 Δ9-two genes 3

28. Synechococcus sp. WH5701 Δ9, Δ12 Two genes each 4

29. Synechococcus sp. WH7803 Δ9, Δ12 Two genes each 4

30. Synechococcus sp.WH7805 Δ9, Δ12 Two genes each 4

31. Synechococcus sp. WH8102 Δ9, Δ12 Δ12-two genes 3

32. Synechocystis sp. PCC 6803 Δ9, Δ12, Δ15, Δ6 One gene each 4

33. T . elongatus strain BP-1 Δ9 Three genes 3

34. Trichodesmium erythraeum IMS101 Δ9, Δ12, Δ15 One gene each 3

35. Lyngbya sp. PCC 6106 Δ9, Δ12, Δ15, Δ6 One gene each 4

36. N . spumigena CCY9914 Δ9, Δ12, Δ15, Δ6 Δ9-two genes 5

37. Cyanothece sp. 0110 Δ9, Δ12, Δ15, Δ6 Δ9-two genes 5

similarities and the genes were identifi ed from the category of genes of unknown function. Chi et al .
(2008) presented a comparative analysis of fatty acid desaturase genes by comparing 37 cyanobacterial
genomes. The cyanobacterial genomes sequenced by various workers have been downloaded and
a comparison made. The types and number of fatty acid desaturase genes are listed in Table 7. In
Synechococcus sp. strain JA-2-3B'a (2-13), Synechococcus sp. strain JA-3-3A'b, S . elongatus PCC 6301
and S . elongatus PCC 7942 one gene each of Δ 9 desaturase is found. In Synechococcus sp. RS9916 also
a single type of desaturase (Δ 9 ) is present but there are two genes. Likewise, in T . elongatus BP-1, Δ 9