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Cinnamate 4-hydroxylase (C4H, CYP73A) is a cytochrome P450 monooxygenase associated externally with endoplasmic reticulum of plant cells. The enzyme uses NADPH-cytochrome P450 reductase (CPR) as a donor of electrons and hydroxylates cinnamic acid to form 4-coumaric acid in phenylpropanoid metabolism. In order to better understand the structure and function of this unique class of plant P450 enzymes we have characterized the enzyme C4H1 from lignifying tissues of sorghum, encoded by Sobic.002G126600. Here we report the 1.7 Å resolution cr