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. 1989 Jan 15;257(2):599-602.
doi: 10.1042/bj2570599.

Incorporation of atmospheric oxygen into the carbonyl functionality of the protochlorophyllide isocyclic ring

C J Walker  1 , K E Mansfield, K M Smith, P A Castelfranco
Affiliations

Incorporation of atmospheric oxygen into the carbonyl functionality of the protochlorophyllide isocyclic ring

C J Walker et al. Biochem J. .

Abstract

Detached cucumber (Cucumis sativus L. var. Beit Alpha) cotyledons incubated in darkness with 5-aminolaevulinic acid and either 16O2 air (control) or 18O2 in N2 accumulated protochlorophyllide. This was converted into methyl phaeoporphyrin alpha 5 and analysed by mass spectrometry. The molecular ion of the methyl phaeoporphyrin alpha 5 derived from the 18O2 incubation was 2 mass units greater than that of the control, establishing that the oxo oxygen atom of the isocyclic ring is derived from atmospheric oxygen.

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