Abstract
A recombinant plasmid, pArab8, harbouring the cDNA encoding the mature form of the tetrapyrrole synthesis enzyme porphobilinogen deaminase (EC 4.3.1.8; also known as hydroxymethylbilane synthase) from Arabidopsis thaliana (L.) Heynh. has been constructed, and used to transform Escherichia coli. The porphobilinogen deaminase protein from Arabidopsis was overexpressed in this strain, and purified to homogeneity (3000-fold) with a yield of 20%. Antibodies were raised against the purified plant enzyme, and used in Western blot analysis, immunoprecipitation of enzyme activity and immuno-gold electron microscopy. The results indicate that the enzyme is confined to plastids in both leaves and roots. The implications of this finding for plant tetrapyrrole synthesis are discussed.
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Abbreviations
- DEAE:
-
diethylaminoethyl
- FPLC:
-
fast protein liquid chromatography
- PBG:
-
porphobilinogen
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This work was supported by Science and Engineering Research Council (SERC) and Agricultural and Food Research Council (AFRC) grants to P.M.J. and an AFRC grant to A.G.S. The protein sequencing was carried out by Mr Lawrence Hunt of the SERC MRI Protein Sequencing Unit (Director Dr M.G. Gore) at Southampton University. We acknowledge the Wellcome Foundation for financial support of the Protein and Nucleic Acid Chemistry Facility at the University of Cambridge, where the oligonucleotide primers were synthesised.
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Witty, M., Jones, R.M., Robb, M.S. et al. Subcellular location of the tetrapyrrole synthesis enzyme porphobilinogen deaminase in higher plants: an immunological investigation. Planta 199, 557–564 (1996). https://doi.org/10.1007/BF00195187
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DOI: https://doi.org/10.1007/BF00195187