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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides

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Published on: November 21, 2013

Supramolecular secondary helical structures in solid-state N-protected amino acids.

Zhaohui Zong¹, Aiyou Hao¹, Pengyao Xing¹

¹School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China. xingpengyao@sdu.edu.cn.

|October 22, 2020

Summary

Solid-state N-protected amino acids commonly form supramolecular helical structures, similar to protein alpha-helices. This discovery offers insights into chiral materials and crystal engineering.

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Area of Science:

Supramolecular Chemistry
Organic Chemistry
Crystallography

Background:

Helical secondary structures are fundamental in proteins but rarely observed in simple amino acid derivatives.
N-protected amino acids represent a class of molecules where such structures have been overlooked.

Purpose of the Study:

To investigate the prevalence and characteristics of supramolecular helical secondary structures in solid-state N-protected amino acids.
To explore the relationship between these structures and chiroptical properties.

Main Methods:

Database searching within the Cambridge Structural Database.
Screening of N-protected amino acid structures.
Computational analysis of electronic circular dichroism (ECD) spectra.

Main Results:

Approximately 10% of surveyed N-protected amino acids form hydrogen-bonded helical structures.
Identified helical structures exhibit 21 and 31 symmetry, including double-strand helices.
Computational ECD spectra correlate well with experimental data, showing Cotton effects analogous to protein alpha-helices.

Conclusions:

N-protected amino acids can form supramolecular helical secondary structures in the solid state.
These structures exhibit characteristic Cotton effects transferable to protecting groups, relevant for chiroptical materials.
This work enhances understanding of structure-property relationships in supramolecular chiral and chiroptical materials.