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Table 2 Comparison of extracellular transport genes in the S. velum symbiont, other symbiotic and free-living bacteria

From: The genome of the intracellular bacterium of the coastal bivalve, Solemya velum: a blueprint for thriving in and out of symbiosis

Organism

Lifestyle

Transporter gene ratio to S. velum endosymbiont

Genome size (Mb)

Total number of genes involved in transport

Transporter genes per Mb of genome

ATP-dependent transporters

Secondary transporters

Phosphotransferase systems

Ion channels

Unclassified transporters

Protein secretion systems

Outer membrane transporters

Solemya velum endosymbiont

Intracellular symbiont

1.00

2.7

224

75.2

100

70

1

5

5

17

26

C. magnifica endosymbiont

OIS*

0.14

1.16

32

27.6

18

6

0

3

1

0

4

C. okutanii endosymbiont

OIS

0.15

1.02

34

33.3

16

10

0

2

3

0

3

Buchnera aphidicola APS

OIS

0.07

0.64

16

25.0

5

3

5

1

0

0

2

Sulcia muelleri GWSS

OIS

0.03

0.25

7

28.0

4

2

0

0

0

0

1

Ca. Blochmannia floridanus

OIS

0.12

0.71

27

38.0

7

12

3

2

0

0

3

Wigglesworthia glossinidia

OIS

0.11

0.70

25

35.7

9

14

0

2

0

0

0

Baumannia cicadellinicola

OIS

0.13

0.69

28

40.6

11

10

3

1

0

0

3

R. leguminosarum bv. Viciae 3841

FIS*

2.47

7.75

553

71.4

281

203

7

18

2

13

29

Frankia alni ACN14a

FIS

1.05

7.50

236

31.5

114

106

0

12

1

1

4

Vibrio fischeri MJ11

Extracellular symbiont

1.80

4.50

404

89.8

138

141

12

10

6

46

51

Wolbachia pipientis wSim

OIS/parasite

0.21

1.06

48

45.3

19

28

0

0

1

8

0

Rickettsia prowazekii MadridE

Intracellular parasite

0.21

1.10

48

43.6

15

30

0

1

1

0

5

Escherichia coli K-12-MG1655

Commensal

1.58

4.64

354

76.3

74

235

29

13

2

3

35

Klebsiella pneumoniae kp342

Commensal

2.82

5.92

632

106.8

160

336

44

17

4

37

34

Thiomicrospira crunogena XCL-2

Free-living sulfide oxidizer

0.73

2.43

163

67.1

38

58

0

10

3

35

19

Allochromatium vinosum DSM 180

Free-living sulfide oxidizer

0.89

3.67

199

54.2

81

52

5

8

7

14

32

Sulfurimonas denitrificans DSM 1251

Free-living sulfide oxidizer

0.43

2.20

97

44.1

32

52

0

10

3

6

25

Methylococcus capsulatus Bath

Free-living methanotroph

0.76

3.30

171

51.8

56

60

0

6

2

16

31

Thermodesulfovibrio yellowstonii DSM 11347

Free-living sulfate reducer

0.39

2.00

88

44.0

31

34

0

3

2

3

15

  1. OIS - obligate intracellular symbiont; FIS - free-living intracellular symbiont.
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BMC Genomics

ISSN: 1471-2164

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