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Updated: Feb 15, 2026

Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry
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Absolute Quantitation of Inositol Pyrophosphates by Capillary Electrophoresis Electrospray Ionization Mass Spectrometry

Published on: August 13, 2021

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Role of the inositol pyrophosphate multikinase Kcs1 in Cryptococcus inositol metabolism

Guojian Liao1, Yina Wang2, Tong-Bao Liu2

  • 1Public Health Research Institute Center, Rutgers University - New Jersey Medical School, Newark, NJ, USA; College of Pharmaceutical Sciences, Southwest University, Chongqing, China.

Fungal Genetics and Biology : FG & B
|January 23, 2018
PubMed

Insights

In Cryptococcus neoformans, Kcs1 protein regulates inositol uptake and breakdown. This finding is crucial for understanding fungal meningitis and developing new treatments.

Area of Science:

  • Mycology
  • Molecular Biology
  • Fungal Pathogenesis

Background:

  • Cryptococcus neoformans causes deadly fungal meningitis.
  • Inositol utilization is vital for C. neoformans development and virulence.
  • Regulation of inositol utilization in C. neoformans is currently unknown.

Purpose of the Study:

  • To investigate the regulatory role of inositol hexakisphosphate kinase (Kcs1) in inositol metabolism in C. neoformans.
  • To determine how Kcs1 influences inositol acquisition and utilization pathways.
  • To elucidate the function of Kcs1 in maintaining inositol homeostasis.

Main Methods:

  • Gene expression analysis of inositol pyrophosphate biosynthesis genes.
  • Generation and phenotypic characterization of a kcs1 deletion mutant (kcs1Δ).
  • Comparison of kcs1Δ mutant with wild-type C. neoformans strains regarding inositol uptake and catabolism.

Main Results:

  • Inositol represses genes involved in inositol pyrophosphate biosynthesis, including KCS1.
  • Kcs1 negatively regulates inositol uptake and catabolism in C. neoformans.
  • Unlike in Saccharomyces cerevisiae, Kcs1 does not appear to regulate inositol biosynthesis in C. neoformans.

Conclusions:

  • Kcs1 plays a key role in fine-tuning inositol acquisition in C. neoformans.
  • Kcs1 is essential for maintaining inositol homeostasis in this fungal pathogen.
  • Understanding Kcs1's function provides insights into cryptococcal virulence and potential therapeutic targets.

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