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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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Targeting the GPI biosynthetic pathway.

Usha Yadav1, Mohd Ashraf Khan2

  • 1a Department of Microbiology , University of Delhi , New Delhi , India.

Pathogens and Global Health
|February 28, 2018
PubMed
Summary

The Glycosylphosphatidylinositol (GPI) pathway is crucial for anchoring proteins in eukaryotes. Targeting differences in pathogen GPI pathways offers promising drug development strategies against diseases.

Keywords:
Candida albicansGPI inhibitorGlycosylphosphatidylinositol (GPI)Gwt1Mcd4

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Area of Science:

  • Biochemistry and Molecular Biology
  • Parasitology and Mycology
  • Drug Discovery and Development

Background:

  • The Glycosylphosphatidylinositol (GPI) biosynthetic pathway is a conserved eukaryotic process essential for cell surface protein anchoring.
  • Divergences in the GPI pathway between mammals and pathogens present opportunities for targeted therapeutic interventions.
  • GPI structures and GPI-anchored proteins often function as critical pathogenicity factors in various protozoan and fungal species.

Purpose of the Study:

  • To highlight the significance of the GPI biosynthetic pathway as a target for novel drug development.
  • To review the role of GPI-anchored molecules in the pathogenicity of key human parasites and fungi.
  • To underscore the potential of exploiting pathway-specific differences for creating effective inhibitors.

Main Methods:

  • Review and synthesis of existing research on GPI pathway structures and functions in pathogenic organisms.
  • Analysis of known GPI-anchored proteins and molecules involved in pathogenicity (e.g., VSG, MSP1, LPGs, mannoproteins).
  • Examination of established and emerging drug targets within the GPI pathway and their inhibitors.

Main Results:

  • Identification of specific GPI pathway components and anchored proteins crucial for pathogen survival and virulence.
  • Demonstration of successful development of parasite-specific inhibitors (e.g., targeting GlcNAc-PI de-N-acetylase in Trypanosoma brucei).
  • Validation of antifungal inhibitors targeting key enzymes like fungal inositol acyltransferase (Gwt1) and phosphoethanolamine transferase-I (Mcd4).

Conclusions:

  • The GPI pathway remains a highly promising and actively researched area for developing novel therapeutics against infectious diseases.
  • Targeting unique aspects of the GPI pathway in pathogens offers a viable strategy to combat diseases caused by protozoa and fungi.
  • Continued research into the GPI pathway holds significant potential for improving human health through innovative drug discovery.