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Biosynthesis of myo-inositol in lycopods: characteristics of the pteridophytic l-myo-inositol-1-phosphate synthase and myo-inositol-1-phosphate phosphatase from the strobili of Lycopodium clavatum and Selaginella monospora

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Abstract

Two key enzymes of myo-inositol metabolism [l-myo-inositol-1-phosphate synthase (MIPS) and myo-inositol-1-phosphate-phosphatase (MIPP)] were identified for the first time in Pteridophyta in Lycopodium clavatum and Selaginella monospora. Both enzymes from both plants were partly purified and the degree of purity obtained from 47 to 75 folds. MIPS preparations specifically utilized d-glucose-6-phosphate and NAD+ as its substrate and coenzyme with the K m values for G-6-P and NAD+ were 1.74 and 0.34 mM in L. clavatum; 2.32 and 0.37 mM in S. monospora. MIPP preparations used d/l-myo-inositol-1-phosphate as its principal substrate with the K m values for MIP was 0.068 mM in L. clavatum and 0.076 mM in S. monospora. The pH reliance of all the preparations was around 7.0–7.5 and different cations had variable role.

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Abbreviations

G-6-P:

d-Glucose-6-phosphate

I-1-P:

l-myo-Inositol-1-phosphate

MIP:

myo-Inositol-1-phosphate

MIPP:

d/l-myo-Inositol-1-phosphate phosphatase

MIPS:

l-myo-Inositol-1-phosphate synthase

Pi :

Inorganic phosphate

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Acknowledgments

The authors are grateful to the University Grants Commission, Govt. of India, New Delhi, India for financing the present work with a major research project No. F-33-189/2007 (SR). Thanks are also due to Miss N. Mazumdar for her help.

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Authors and Affiliations

  1. Biochemistry Laboratory, Department of Botany, Presidency University, 86/1 College Street, Kolkata, 700 073, India

    Anusuya Basak, Timir Baran Jha & Jukta Adhikari

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  1. Anusuya Basak
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  2. Timir Baran Jha
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  3. Jukta Adhikari
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Correspondence to Jukta Adhikari.

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Communicated by S. J. Lewak.

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Basak, A., Jha, T.B. & Adhikari, J. Biosynthesis of myo-inositol in lycopods: characteristics of the pteridophytic l-myo-inositol-1-phosphate synthase and myo-inositol-1-phosphate phosphatase from the strobili of Lycopodium clavatum and Selaginella monospora . Acta Physiol Plant 34, 1579–1582 (2012). https://doi.org/10.1007/s11738-012-0924-z

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  • DOI: https://doi.org/10.1007/s11738-012-0924-z

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