Figure 3.

Threonine synthesis pathway. Enzymes surrounded by a thick gray box were shown to be horizontally transferred from Bacteria (see main text). Metabolites – I: glycine; II: threonine; III: phosphohomoserine; IV: homoserine; V: aspartate 4-semialdehyde; VI: 4-aspartyl-phosphate; VII: L-aspartate. Enzymes – threonine aldolase; aspartate kinase; aspartate-semialdehyde dehydrogenase; homoserine dehydrogenase; homoserine kinase; threonine synthase. Abbreviations as for Figure 1.

Alves et al. BMC Evolutionary Biology 2013 13:190   doi:10.1186/1471-2148-13-190
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