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Related Experiment Videos

Evidence for dispensable sequences inserted into a nucleotide fold.

R M Starzyk, T A Webster, P Schimmel

    Science (New York, N.Y.)
    |September 25, 1987
    PubMed
    Summary
    This summary is machine-generated.

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    Internal deletions in Escherichia coli isoleucyl-transfer RNA synthetase (IleRS) show that major sections connecting nucleotide fold parts can be removed without affecting the nucleotide binding site, yielding active enzymes.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • Escherichia coli isoleucyl-transfer RNA synthetase (IleRS) is crucial for protein synthesis.
    • Structural modeling suggests its nucleotide fold initiates in the amino-terminal region.

    Purpose of the Study:

    • To investigate the functional role of the amino-terminal nucleotide fold in IleRS activity.
    • To determine the impact of internal deletions on enzyme stability and nucleotide binding.

    Main Methods:

    • Site-directed mutagenesis to create internal deletions within the nucleotide fold region of IleRS.
    • Enzyme activity assays to assess the functionality of mutant enzymes.
    • Analysis of protein stability for deletion mutants.

    Main Results:

    Related Experiment Videos

    • Deletions spanning up to 145 contiguous amino acids within the nucleotide fold region resulted in active IleRS enzymes.
    • Further extension of these deletions led to inactive or unstable proteins.
    • Structural comparison with homologous proteins suggests active deletions remove segments connecting parts of the nucleotide fold.

    Conclusions:

    • The nucleotide binding site of IleRS is robust and can tolerate the removal of significant polypeptide segments connecting different parts of the nucleotide fold.
    • These findings provide insights into the structural flexibility and functional adaptability of synthetase enzymes.