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Arabidopsis CHL27, Located in Both Envelope and Thylakoid Membranes, Is Required for the Synthesis of Protochlorophyllide
Stephen Tottey, Maryse A. Block, Michael Allen, Tomas Westergren, Catherine Albrieux, Henrik V. Scheller, Sabeeha Merchant and Poul Erik Jensen
Proceedings of the National Academy of Sciences of the United States of America
Vol. 100, No. 26 (Dec. 23, 2003), pp. 16119-16124
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/3149140
Page Count: 6
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CHL27, the Arabidopsis homologue to Chlamydomonas Crd1, a plastid-localized putative diiron protein, is required for the synthesis of protochlorophyllide and therefore is a candidate subunit of the aerobic cyclase in chlorophyll biosynthesis. δ-Aminolevulinic acid-fed antisense Arabidopsis plants with reduced amounts of Crd1/CHL27 accumulate Mg-protoporphyrin IX monomethyl ester, the substrate of the cyclase reaction. Mutant plants have chlorotic leaves with reduced abundance of all chlorophyll proteins. Fractionation of Arabidopsis chloroplast membranes shows that Crd1/CHL27 is equally distributed on a membrane-weight basis in the thylakoid and inner-envelope membranes.
Proceedings of the National Academy of Sciences of the United States of America © 2003 National Academy of Sciences