The tentative (alpha/beta)8-barrel in the pathway of beta-carotene biosynthesis: lycopene cyclase has an amino acid sequence similar to that of xylose isomerase.
Janecek
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D019747:Aldose-Ketose Isomerases; D000595:Amino Acid Sequence; D002238:Carbohydrate Epimerases / Q000737:chemistry*; D004885:Erwinia / Q000201:enzymology; D019753:Intramolecular Lyases; D007535:Isomerases / Q000737:chemistry* / Q000378:metabolism; D008969:Molecular Sequence Data; D017433:Protein Structure, Secondary; D017386:Sequence Homology, Amino Acid; D013302:Streptomyces / Q000201:enzymology*; D019207:beta Carotene / Q000096:biosynthesis*
D019207:beta Carotene; D007535:Isomerases; D002238:Carbohydrate Epimerases; D019747:Aldose-Ketose Isomerases; C023298:xylose isomerase; D019753:Intramolecular Lyases; C070925:lycopene cyclase-isomerase