Does the edge-to-face interaction between aromatic rings occur in cyclolinopeptide A analogues?

¹Institute of Chemistry, University of Wrocław, Poland.

International Journal of Peptide and Protein Research

|July 1, 1994

Summary

Cyclolinopeptide A analogues exhibit unique conformations and aromatic ring interactions in cyclic forms, unlike their linear counterparts. Substitutions and positions of tyrosine residues significantly impact peptide properties and optical activity.

Area of Science:

Biochemistry
Spectroscopy
Medicinal Chemistry

Background:

Cyclolinopeptide A (CLA) is a cyclic peptide with potential biological activities.
Understanding structure-activity relationships is crucial for peptide drug design.

Purpose of the Study:

To investigate the conformational and spectroscopic properties of cyclolinopeptide A (CLA) and its tyrosine analogues.
To compare the characteristics of cyclic peptides with their linear counterparts.
To elucidate the impact of tyrosine substitutions on peptide structure and interactions.

Main Methods:

1H-NMR spectroscopy
Fluorescence spectroscopy
Circular Dichroism (CD) spectroscopy

Main Results:

Cyclic peptides (CLA and analogues) showed similar conformations, distinct from more diverse linear peptide conformations.
NMR revealed perpendicular aromatic ring arrangements (edge-to-face pairing) in cyclic peptides, absent in linear ones.
Fluorescence quantum yields were lower in cyclic peptides due to aromatic chromophore interactions, influenced by tyrosine position.
Optical activity of aromatic side chains varied with position (position 8 active, position 9 inactive), explained by conformational differences.

Conclusions:

Conformational similarities exist among cyclic CLA analogues, driven by specific aromatic ring interactions.
Linear peptide conformations are more varied, with some resembling cyclic structures.
Tyrosine substitution and its position critically influence peptide spectral properties and side-chain conformation.

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Does the edge-to-face interaction between aromatic rings occur in cyclolinopeptide A analogues?

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Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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