Correlating structure and affinity for PEX5: PTS1 complexes

Gregory J. Gatto, Ernest L. Maynard, Anthony L Guerrerio, Brian V. Geisbrecht, Stephen J Gould, Jeremy M. Berg

Research output: Contribution to journalArticle

Abstract

Many proteins that are destined to reside within the lumen of the peroxisome contain the peroxisomal targeting signal-1 (PTS1), a C-terminal tripeptide approximating the consensus sequence -Ser-Lys-Leu-COO-. The PTS1 is recognized by the tetratricopeptide repeat (TPR) domains of PEX5, a cytosolic receptor that cycles between the cytoplasm and the peroxisome. To gain insight into the energetics of PTS1 binding specificity and to correlate these with features from the recently determined structure of a PEX5:PTS1 complex, we used a fluorescence-based binding assay that enables the quantitation of the dissociation constants for PTS1-containing peptide complexes with the TPR region of human PEX5. Through application of this assay to a collection of pentapeptides containing different C-terminal tripeptide sequences, including both natural and unnatural amino acids, the thermodynamic effects of sequence variation were examined. PTS1 variants that correspond to known functional targeting signals bind to the PEX5 fragment with a change in the standard binding free energy within 1.8 kcal mol-1 of that corresponding to the peptide ending with -Ser-Lys-Leu-COO-. The results suggest that a binding energy threshold may determine the functionality of PTS1 sequences.

Original languageEnglish (US)
Pages (from-to)1660-1666
Number of pages7
JournalBiochemistry®
Volume42
Issue number6
DOIs
StatePublished - Feb 18 2003

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seryl-lysyl-leucine
Peroxisomes
Assays
Peptides
Consensus Sequence
Protein Sorting Signals
Binding energy
Thermodynamics
Free energy
Cytoplasm
Fluorescence
Amino Acids
Proteins
carboxyl radical

ASJC Scopus subject areas

  • Biochemistry

Cite this

Gatto, G. J., Maynard, E. L., Guerrerio, A. L., Geisbrecht, B. V., Gould, S. J., & Berg, J. M. (2003). Correlating structure and affinity for PEX5: PTS1 complexes. Biochemistry®, 42(6), 1660-1666. https://doi.org/10.1021/bi027034z

Correlating structure and affinity for PEX5 : PTS1 complexes. / Gatto, Gregory J.; Maynard, Ernest L.; Guerrerio, Anthony L; Geisbrecht, Brian V.; Gould, Stephen J; Berg, Jeremy M.

In: Biochemistry®, Vol. 42, No. 6, 18.02.2003, p. 1660-1666.

Research output: Contribution to journalArticle

Gatto, GJ, Maynard, EL, Guerrerio, AL, Geisbrecht, BV, Gould, SJ & Berg, JM 2003, 'Correlating structure and affinity for PEX5: PTS1 complexes', Biochemistry®, vol. 42, no. 6, pp. 1660-1666. https://doi.org/10.1021/bi027034z
Gatto, Gregory J. ; Maynard, Ernest L. ; Guerrerio, Anthony L ; Geisbrecht, Brian V. ; Gould, Stephen J ; Berg, Jeremy M. / Correlating structure and affinity for PEX5 : PTS1 complexes. In: Biochemistry®. 2003 ; Vol. 42, No. 6. pp. 1660-1666.
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