Journal Article

Rice Peptide Deformylase PDF1B is Crucial for Development of Chloroplasts

Sunok Moon, Carmela Giglione, Dong-Yeon Lee, Suyoung An, Dong-Hoon Jeong, Thierry Meinnel and Gynheung An

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 10, pages 1536-1546
Published in print October 2008 | ISSN: 0032-0781
Published online August 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn121
Rice Peptide Deformylase PDF1B is Crucial for Development of Chloroplasts

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  • Biochemistry
  • Molecular and Cell Biology
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Because protein synthesis begins with N-formylmethionine in plant endosymbiotic organelles, removal of the formyl group by peptide deformylase (PDF) is essential to allowing the excision of the first methionine. Rice contains three copies (OsPDF1A, OsPDF1B and OsPDF1B2) of the PDF genes. Unlike OsPDF1A and OsPDF1B, OsPDF1B2 is apparently non-functional, with several deleterious substitutions and deletions. OsPDF1A is more strongly expressed in the roots, while OsPDF1B is expressed at higher levels in mature leaves. Transient expression of PDF–green fluorescent protein (GFP) fusion proteins in the protoplasts demonstrates that, unlike OsPDF1A, OsPDF1B is localized in both the chloroplasts and the mitochondria. We used T-DNA insertional alleles to elucidate functional roles associated with OsPDF1B. Homozygous plants of pdf1b/pdf1b exhibited the phenotypes of chlorina and growth retardation. Histochemical analysis showed that the length of their mesophyll cells was increased 4- to 5-fold, resulting in a reduction in the total number of cells. Transmission electron microscopy analyses revealed that chloroplasts were severely damaged and mitochondria appeared to be mildly altered in the pdf1b mutants. Expression of genes encoded in the chloroplasts and mitochondria was altered in the mutants. Based on these results, we conclude that OsPDF1B is essential for the development of chloroplast and perhaps mitochondria.

Keywords: Chloroplast; Chlorina; Growth retardation; Mitochondria; Peptide deformylation; Rice

Journal Article.  6277 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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