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Table 1 Mobility frequencies of deletions and point mutations in Ll.LtrB ΔDIVb(1–2)

From: Mutations in the Lactococcus lactis Ll.LtrB group II intron that retain mobility in vivo

Deletion or mutation (nucleotides1)

Deletion Size (nucleotides)

Tertiary structure element(s)2

Mobility Frequency3,4,5 (%)

Wild type Ll.LtrB ΔORF 3

  

100

Domain I :

   

1. Ia (29–43)

15

 

1.6 ± 2.1×10-3

2. Ib (46–61)

16

α

0.06

3. Ic (65–166)

102

ε', θ, β

3 × 10-3

4. Ic1 (70–116)

47

ε', θ

<10-3

5. Ic2 (122–160)

39

β

<10-3

6. κ helix (190–204)

15

κ

0.37

7. κ helix Id(ii)1 (185–201)

17

κ

<10-4

8. Helix Id(iii) (205–210,339–346)

14

 

2 ± 3 × 10-4

9. Id2 (233–255)

23

β'

2.5 ± 2.1 × 10-3

10. Id3(i)1 (295–303)

9

α'

2 ± 1.4 × 10-3

11. Id4 (316–333)

18

 

1.5 ± 0.7 × 10-3

12. Ib and Id3(i)1 (46–61, 295–303)

25

α, α'

<10-3

13. Ic2 and Id2 (122–160, 233–255)

62

β, β'

<10-4

Domain II:

   

14. II (395–467)

73

θ', η

<10-4

15. IIb (432–449)

18

 

18.26 ± 3.44

16. II(ii)a,b (404–459)

56

η

0.23 ± 0.32

Domain III:

   

17. III (474–523)

50

 

<10-4

18. III(ii),(iii) (486–513)

28

 

<10-3

Domain IV:

   

19. IVa (538–597)

60

 

6 ± 4 × 10 -4

20. IVb(1–2) (606–2382)

158

 

69.7 ± 14.57

Domain V:

   

21. V (G3A) (2399)

  

0.25 ± 0.07

22. V (G3C)

  

4 × 10 -3

23. V (G3U)

  

3 ± 1.4 × 10 -3

Domain VI:

   

24. VI (A54 deletion) (2486)

1

 

3 ± 0.7 × 10 -3

25. VI (A54 G)

  

2.02 ± 0.02

26. VI (A54 C)

  

1.12 ± 1.25

27. VI (A54 U)

  

0.67 ± 0.47

  1. 1: Numbering is for the full length intron 2: The tertiary elements associated with the domain or sub-domain 3: Frequencies were compared to the wild-type Ll.LtrB intron (ΔORF construct) set equal to 100%; absolute frequencies for the wild-type intron were 30–60% 4: Each value is the average of at least 2 independent assays 5: Numbers in bold represent deletions or mutations that were true homing events (based on PCR verification and sequencing)