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Formation of Lipopolysaccharides01:19

Formation of Lipopolysaccharides

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Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin,...
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Related Experiment Video

Updated: Apr 12, 2026

Enrichment of Bacterial Lipoproteins and Preparation of N-terminal Lipopeptides for Structural Determination by Mass Spectrometry
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Lipoprotein assembly and function in an evolutionary perspective.

Dick J Van der Horst, Kees W Rodenburg

    Biomolecular Concepts
    |May 12, 2015
    PubMed
    Summary

    Lipid transport proteins in mammals and insects show structural similarities but functional differences in lipid delivery. Insect lipoproteins act as reusable shuttles, unlike mammalian ones which are degraded after lipid delivery.

    Area of Science:

    • Biochemistry
    • Comparative Biology
    • Molecular Evolution

    Background:

    • Circulatory fat transport in animals utilizes large lipid transfer protein (LLTP) superfamily members, including apolipoprotein B (apoB) in mammals and apolipophorin II/I (apoLp-II/I) in insects.
    • These proteins form the structural basis of lipoproteins, acquiring lipids via microsomal triglyceride-transfer protein and utilizing amphipathic helical and sheet motifs for binding.

    Purpose of the Study:

    • To comparatively analyze the evolution and structural adaptations of lipid-binding proteins within the LLTP superfamily.
    • To elucidate the functional differences in lipid delivery mechanisms and receptor interactions between mammalian and insect lipoproteins.

    Main Methods:

    • Comparative analysis of apolipoprotein structures and functions.
    • Investigating post-translational modifications and lipoprotein processing in insects.

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  • Examining the roles of lipoprotein receptors in lipid uptake and recycling.

    • Main Results:

    • Insect apoLp-II/I undergoes post-translational cleavage by furin, forming two apolipoproteins in high-density lipophorin (HDLp).
    • Mammalian apoB-lipoprotein remnants are degraded after endocytosis, while insect HDLp functions as a reusable lipid shuttle.
    • Insect HDLp is recycled similarly to transferrin, even after receptor-mediated endocytosis.

    Conclusions:

    • Despite structural similarities, mammalian and insect lipoproteins exhibit distinct lipid delivery strategies and receptor-mediated recycling mechanisms.
    • Functional adaptations in lipoprotein carriers and their receptors reflect divergent evolutionary paths in lipid transport.