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Context-dependent substrate recognition by protein farnesyltransferase.

James L Hougland1, Corissa L Lamphear, Sarah A Scott

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Biochemistry
|February 10, 2009
PubMed
Summary
This summary is machine-generated.

Protein farnesyltransferase (FTase) recognizes prenylation substrates by evaluating the hydrophobicity and steric volume of the a(2) residue. This enzyme exhibits context-dependent selectivity, impacting substrate recognition and inhibitor design.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Prenylation is a critical posttranslational modification involving C-terminal lipidation for protein membrane localization.
  • The "Ca(1)a(2)X" motif is recognized by prenylation enzymes like protein farnesyltransferase (FTase) and protein geranylgeranyltransferase type I.

Purpose of the Study:

  • To elucidate the specific parameters governing the recognition of the a(2) residue by FTase.
  • To understand how the hydrophobicity and steric volume of the a(2) side chain influence FTase substrate discrimination.
  • To investigate the role of the adjacent X residue in context-dependent a(2) selectivity.

Main Methods:

  • Structure-activity analysis was employed to define FTase recognition parameters.
  • Kinetic analysis was performed to pinpoint the stage of discrimination within the enzymatic mechanism.

Main Results:

  • FTase discriminates peptide substrates based on the hydrophobicity and steric volume of the a(2) residue's side chain.
  • For nonpolar side chains, maximal activity was observed with steric volumes similar to valine, forming a pyramidal pattern.
  • a(2) selectivity is influenced by the adjacent X residue, indicating context-dependent recognition.

Conclusions:

  • FTase recognizes the prenylation motif as interconnected elements rather than independent amino acids.
  • These findings broaden the understanding of FTase substrates and their cellular roles.
  • Improved knowledge of FTase substrate recognition can inform the development of novel therapeutic inhibitors and the characterization of prenylation pathways.