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Table 4 Most common SCOP folds in minimal organisms. Which SCOP folds are most common in minimal organisms? The first column gives the name and SCOP sccs identifier for folds classified in SCOP 1.67. The second column gives the total number of domains assigned to each fold among the five minimal organisms. The third column is calculated as the average number of domains among the five minimal organisms studied that were assigned to each fold, divided by the number of domains in E. coli assigned to the same fold.

From: Structural proteomics of minimal organisms: Conservation of protein fold usage and evolutionary implications

Fold Name

Number

Ratio

P-loop containing nucleoside triphosphate hydrolases (c.37)

319

0.23

TIM beta/alpha-barrel (c.1)

115

0.14

OB (Oligonucleotide/oligosaccharide-binding) fold (b.40)

108

0.34

Ferredoxin-like (d.58)

95

0.15

Adenine nucleotide alpha hydrolase-like (c.26)

92

0.40

Ribonuclease H-like motif (c.55)

79

0.16

NAD(P)-binding Rossmann-fold domains (c.2)

75

0.12

Class II aaRS and biotin synthetases (d.104)

56

0.75

DNA/RNA-binding 3-helical bundle (a.4)

53

0.04

Reductase/isomerase/elongation factor common domain (b.43)

51

0.43

Flavodoxin-like (c.23)

51

0.11