Substrate-free Delta9-18:0-acyl carrier protein desaturase (abbreviated to Des)[E.C. # 1.14.99.6] was 2-electron reduced with E'0=-0.03 +-0.01 V; the presence of spinach ferredoxin (SpFd) induces an additional 1-electron reduction wave at E'0=-0.21 +-0.02 V, which shifts by 0.106 V upon substrate binding.
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Reipa et al. (2004) studied this question.
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