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Related Experiment Videos

Tissue-type plasminogen activator: variants and crystal/solution structures demarcate structural determinants of

W Bode1, M Renatus

  • 1Max-Planck-Institut für Biochemie, Abteilung für Strukturforschung, Martinsried-Planegg, Germany. bode@biochem.mpg.de

Current Opinion in Structural Biology
|January 22, 1998
PubMed
Summary

Structural insights into tissue-type plasminogen activator (t-PA) reveal key features of its catalytic domain. These findings illuminate t-PA

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Medicine

Background:

  • Numerous structural components of tissue-type plasminogen activator (t-PA) are now characterized.
  • Existing data includes NMR and crystal structures of key domains like finger-EGF pair and kringle-2.
  • Proteolytic domains of both vampire bat PA and human t-PA in different forms have also been solved.

Purpose of the Study:

  • To elucidate the structural basis for the specific enzymatic activity of t-PA.
  • To understand the molecular mechanisms underlying the narrow substrate specificity of t-PA.
  • To identify structural determinants of t-PA's catalytic activity, particularly in its single-chain form.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy.

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  • X-ray crystallography to determine 3D structures.
  • Mutational analysis to probe functional roles of specific residues.

    • Main Results:

    • Structural data confirms a trypsin-like fold for the t-PA proteolytic domain.
    • Surface loops near the catalytic center are identified as crucial for t-PA's specific substrate recognition.
    • The Lys156 sidechain is identified as a key factor in single-chain t-PA's amidolytic activity, substituting for the N-terminal Ile16 in the two-chain form.

    Conclusions:

    • Structural and mutational data provide a detailed understanding of t-PA's catalytic mechanism and specificity.
    • The findings offer insights into the regulation of t-PA activity.
    • These discoveries pave the way for designing novel t-PA variants with enhanced therapeutic potential.