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Pyrroloquinoline-quinone and its versatile roles in biological processes

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Abstract

Pyrroloquinoline-quinine (PQQ) was initially characterized as a redox cofactor for membrane-bound dehydrogenases in the bacterial system. Subsequently, PQQ was shown to be an antioxidant protecting the living cells from oxidative damage in vivo and the biomolecules from artificially produced reaction oxygen species in vitro. The presence of PQQ has been documented from different biological samples. It functions as a nutrient and vitamin for supporting the growth and protection of living cells under stress. Recently, the role of PQQ has also been shown as a bio-control agent for plant fungal pathogens, an inducer for proteins kinases involved in cellular differentiation of mammalian cells and as a redox sensor leading to development of biosensor. Recent reviews published on PQQ and enzymes requiring this cofactor have brought forth the case specific roles of PQQ. This review covers the comprehensive information on various aspects of PQQ known till date. These include the roles of PQQ in the regulation of cellular growth and differentiation in mammalian system, as a nutrient and vitamin in stress tolerance, in crop productivity through increasing the availability of insoluble phosphate and as a bio-control agent, and as a redox agent leading to the biosensor development. Most recent findings correlating the exceptionally high redox recycling ability of PQQ to its potential as anti-neurodegenerative, anticancer and pharmacological agents, and as a signalling molecule have been distinctly brought out. This review discusses different findings suggesting the versatility in PQQ functions and provides the most plausible intellectual basis to the ubiquitous roles of this compound in a large number of biological processes, as a nutrient and a perspective vitamin.

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Acknowledgements

I am grateful Dr SK Apte for his support and appreciation for carrying out research on this novel molecule. Dr (Mrs) Shruti Desai, Mrs Swathi Kota and Ms Kruti Mehta for critical reading of the manuscript and Prof YC Kim, Prof F Lisdat and Prof I Hwang for granting permission to reproduce the respective figures from their published papers.

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  1. Molecular Biology Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India

    H S Misra, Y S Rajpurohit & N P Khairnar

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Corresponding editor: Sudha Bhattacharya

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Misra, H.S., Rajpurohit, Y.S. & Khairnar, N.P. Pyrroloquinoline-quinone and its versatile roles in biological processes. J Biosci 37, 313–325 (2012). https://doi.org/10.1007/s12038-012-9195-5

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