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Table 2 Phylogenetic distribution of HisIE and HisNB genes.

From: The role of gene fusions in the evolution of metabolic pathways: the histidine biosynthesis case

Domain

Phylum

Class

# His+

% HisIE

% HisNB

Bacteria

Acidobacteria

Acidobacteria

1

0

0

  

Solibacteres

1

0

0

 

Actinobacteria

Actinobacteria

36

2.8

0

 

Aquificae

Aquificae

1

100

0

 

Bacteroidetes

Bacteroidetes

2

100

50

  

Flavobacteria

1

100

100

  

Sphingobacteria

1

100

100

 

Chlorobi

Chlorobia

4

0

0

 

Chloroflexi

Dehalococcoidetes

2

0

0

 

Cyanobacteria

Chroococcales

10

90

0

  

Gloeobacteria

1

100

0

  

Nostocales

2

100

0

  

Oscillatoriales

1

100

0

  

Prochlorales

10

100

0

 

Firmicutes

Bacilli

37

48.7

0

  

Clostridia

10

80

0

 

Planctomycetes

Planctomycetacia

1

0

0

 

Proteobacteria

α

52

1.9

1.85

  

β

39

0

0

  

δ

12

16.7

0

  

ε

7

85.7

82

  

γ

89

68.5

95

 

Spirochaetes

Spirochaetes

4

0

0

 

TD group

Deinococci

4

100

0

 

Thermotogae

Thermotogae

1

100

0

Archaea

Crenarchaeota

Thermoprotei

6

0

0

 

Euryarchaeota

Archaeoglobi

1

0

0

  

Halobacteria

4

0

0

  

Methanobacteria

2

0

0

  

Methanococci

3

0

0

  

Methanomicrobia

8

0

0

  

Methanopyri

1

0

0

  

Thermococci

2

100

0

  

Thermoplasmata

1

100

0

  1. Phylogenetic distribution analysis of the fusions HisIE and HisNB, along with the percentage of species possessing one of them (two right – most columns) on the number of histidine producing organisms (as assessed by the presence of his genes in their genome). Eukarya are treated separately (see HIS4 section) and never possess the hisNB gene fusion.