We have identified cDNA clones encoding the two Mg chelatase subunits CHL I and CHL H from tobacco (Nicotiana tabacum) by screening a cDNA library with homologous cDNA fragments from Arabidopsis thaliana. A full-length Chl I cDNA clone encodes a peptide with 426 amino acids. The entire cDNA sequence encoding 1382 amino acid long CHL H was obtained by extension of a truncated cDNA fragment using the ‘rapid amplification of cDNA ends’ (RACE) method. Both genes Chl I and Chl H were strongly expressed in young leaves and to a lesser extent in mature leaves. Only traces of both transcripts were found in flowering organs. Southern blot analysis suggests that CHL I is encoded by a single gene and CHL H most likely by several genes.
Plant Molecular Biology – Springer Journals
Published: Sep 30, 2004
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