{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,12]],"date-time":"2026-10-12T16:51:07Z","timestamp":1791823867223,"version":"4.3.4"},"reference-count":52,"publisher":"Oxford University Press (OUP)","issue":"4","license":[{"start":{"date-parts":[[2000,4,1]],"date-time":"2000-04-01T00:00:00Z","timestamp":954547200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2000,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Magnesium-protoporphyrin IX chelatase (Mg-chelatase) is located at the branchpoint of tetrapyrrole biosynthesis, at which point protoporphyrin IX is distributed for the synthesis of chlorophyll and heme. We investigated the regulatory contribution of Mg-chelatase to the flow of metabolites. In plants, the enzyme complex consists of three subunits, designated CHL D, CHL I, and CHL H. Transgenic tobacco (Nicotiana tabacum) plants expressing antisense RNA for the Mg-chelatase subunit CHL H were analyzed to elucidate further the role of Mg-chelatase in the distribution of protoporphyrin IX into the branched tetrapyrrolic pathway. The transgenic plants displayed a reduced growth rate and chlorophyll deficiency. Both phenotypical properties were correlated with lower Mg-chelatase activity. Unexpectedly, less protoporphyrin IX and heme accumulated, and a decrease in 5-aminolevulinate (ALA)-synthesizing capacity and ALA dehydratase activity paralleled the progressive reduction in Mg-chelatase activity in the transformants compared with control plants. The reduced activities of the early enzymatic steps corresponded with lower levels of transcripts encoding glutamyl-tRNA reductase and ALA-dehydratase. The decreased expression and activities of early enzymes in the pathway could be explained by a feedback-controlled mechanism in response to lower Mg-chelatase activity. We discuss intercompartmental signaling that synchronizes the activities of the first steps in tetrapyrrolic metabolism with the late steps for the synthesis of end products.<\/jats:p>","DOI":"10.1104\/pp.122.4.1161","type":"journal-article","created":{"date-parts":[[2002,7,27]],"date-time":"2002-07-27T05:01:20Z","timestamp":1027746080000},"page":"1161-1170","source":"Crossref","is-referenced-by-count":163,"title":["Role of Magnesium Chelatase Activity in the Early Steps of the Tetrapyrrole Biosynthetic Pathway"],"prefix":"10.1093","volume":"122","author":[{"given":"Jutta","family":"Papenbrock","sequence":"first","affiliation":[{"name":"Institut fu\u0308r Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466 Gatersleben, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hans-Peter","family":"Mock","sequence":"additional","affiliation":[{"name":"Institut fu\u0308r Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466 Gatersleben, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryouichi","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Institut fu\u0308r Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466 Gatersleben, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elisabeth","family":"Kruse","sequence":"additional","affiliation":[{"name":"Institut fu\u0308r Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466 Gatersleben, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernhard","family":"Grimm","sequence":"additional","affiliation":[{"name":"Institut fu\u0308r Pflanzengenetik und Kulturpflanzenforschung, Corrensstrasse 3, 06466 Gatersleben, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2000,4,1]]},"reference":[{"key":"2021062510391447600_R1","first-page":"287","article-title":"Tetrapyrrole metabolism in photosynthetic organisms.","volume-title":"Biosynthesis of Heme and Chlorophylls.","author":"Beale","year":"1990"},{"key":"2021062510391447600_R2","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1016\/0003-2697(76)90527-3","article-title":"A rapid and sensitive method for the quantification of microgram quantities of protein utilizing the principle of protein-dye binding.","volume":"72","author":"Bradford","year":"1976","journal-title":"Anal Biochem"},{"key":"2021062510391447600_R3","doi-asserted-by":"crossref","first-page":"485","DOI":"10.1104\/pp.55.3.485","article-title":"Protoheme turnover and chlorophyll synthesis in greening barley tissue.","volume":"55","author":"Castelfranco","year":"1975","journal-title":"Plant Physiol"},{"key":"2021062510391447600_R4","first-page":"194","article-title":"Biosynthetic studies on chlorophylls: from protoporphyrin IX to protochlorophyllide.","volume-title":"The Biosynthesis of the Tetrapyrrole Pigments. 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