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sll1722, an unassigned open reading frame of Synechocystis PCC 6803, codes for l-myo-inositol 1-phosphate synthase

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Abstract

l-myo-Inositol 1-phosphate synthase (EC 5.5.1.4; MIPS) catalyzes conversion of glucose 6-phosphate to l-myo-inositol 1-phosphate, the first and the rate-limiting step in the production of inositol, and has been reported from evolutionarily diverse organisms. Two forms of the enzyme have been characterized from higher plants, viz. cytosolic and chloroplastic, and the presence of MIPS has been earlier reported from the cyanobacteria (e.g. Spirulina sp.), the presumed chloroplast progenitors. The present study demonstrates possible multiple forms of MIPS and identifies the gene for one of them in the cyanobacterium Synechocystis sp. PCC 6803. Following detection of at least two immunologically cross-reactive MIPS forms, we have been able to identify from the fully sequenced Synechocystis genome an as yet unassigned open reading frame (ORF), sll1722, coding for the approx. 50-kDa MIPS protein, by using biochemical, molecular and bioinformatics tools. The DNA fragment corresponding to sll1722 was PCR-amplified and functional identity of the gene was confirmed by a complementation assay in Saccharomyces cerevisiae mutants containing a disrupted INO1 gene for the yeast MIPS. The sll1722 PCR product was cloned in Escherichia coli expression vector pET20b and the isopropyl β-d-thiogalactopyranoside (IPTG)-induced overexpressed protein product was characterized following complete purification. Comparison of the sll1722 sequences with other MIPS sequences and its phylogenetic analysis revealed that the Synechocystis MIPS gene is quite divergent from the others.

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Abbreviations

CBB :

Coomassie Brilliant Blue

EST :

Expressed sequence tag

G6P :

d-Glucose 6-phosphate

IPTG:

Isopropyl β-d-thiogalactopyranoside

MIPS :

l–myo-Inositol 1-phosphate synthase

ORF:

Open reading frame

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Acknowledgements

A.C. thanks the Council of Scientific and Industrial Research, Government of India for a Senior Research Fellowship, and the Bioinformatics Centre of Bose Institute for facilities. The work is supported by grants to A.L.M. from the Department of Biotechnology, Department of Science and Technology and Council of Scientific and Industrial Research, Government of India.

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  1. Plant Molecular and Cellular Genetics, Bose Institute (Centenary Building), P-1/12 CIT Scheme VII M, 700054, Kolkata, India

    Anirban Chatterjee, Manoj Majee, Shilpi Ghosh & Arun Lahiri Majumder

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  1. Anirban Chatterjee
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  2. Manoj Majee
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  3. Shilpi Ghosh
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  4. Arun Lahiri Majumder
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Correspondence to Arun Lahiri Majumder.

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Chatterjee, A., Majee, M., Ghosh, S. et al. sll1722, an unassigned open reading frame of Synechocystis PCC 6803, codes for l-myo-inositol 1-phosphate synthase. Planta 218, 989–998 (2004). https://doi.org/10.1007/s00425-003-1190-5

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