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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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The revised structure of capreomycin

S Nomoto, T Teshima, T Wakamiya

    The Journal of Antibiotics
    |November 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Structural elucidation of capreomycins IA and IB revealed a revised molecular structure. This study clarifies the linkage of beta-lysine within the cyclic pentapeptide, differing from tuberactinomycins.

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    Area of Science:

    • Biochemistry
    • Organic Chemistry
    • Structural Biology

    Background:

    • Capreomycins are peptide antibiotics used in tuberculosis treatment.
    • Previous structural proposals for capreomycins IA and IB existed but required refinement.
    • Comparative analysis with tuberactinomycins is a key strategy for elucidating related structures.

    Purpose of the Study:

    • To determine the definitive total structures of capreomycins IA and IB.
    • To revise and clarify the previously proposed molecular architecture of these antibiotics.
    • To elucidate the specific linkage of the beta-lysine residue within the cyclic pentapeptide.

    Main Methods:

    • Nuclear Magnetic Resonance (NMR) spectroscopy was the primary analytical technique.
    • Comparative spectral analysis of capreomycins and tuberactinomycins was employed.
    • Structure elucidation involved detailed interpretation of NMR data.

    Main Results:

    • The total structures of capreomycins IA and IB were definitively determined.
    • A revised structure for capreomycins IA and IB is proposed, correcting prior models.
    • The linkage of the beta-lysine residue to alpha, beta-diaminopropionic acid was clarified.
    • This linkage was found to differ from that observed in tuberactinomycins.

    Conclusions:

    • The revised structures of capreomycins IA and IB provide accurate molecular insights.
    • Understanding these structural nuances is crucial for antibiotic mechanism studies.
    • The findings highlight the structural diversity within related cyclic peptide antibiotics.