Helix compactness and stability

Structure, stability, cooperativity and molecular packing of two major backbone forms: 3-10-helix and
b-strand are investigated. Long models HCO-(Xxx)n-NH2 Xxx = Gly and (L-)Ala, n < 34, are studied at
two levels of theory including the effect of dispersion forces. Structure and folding preferences are
established, the length modulated cooperativity and side-chain determined fold compactness is quantified.
By monitoring DG(b->a) rather than the electronic energy, DE(b->a), it appears that Ala is a much better
helix forming residue than Gly. The achiral Gly forms a more compact 310-helix than any chiral amino
acid residue probed here for L-Ala.

Related publications

  • Imre Jákli , Szilárd N. Fejér , Ödön Farkas , Béla Viskolcz , Svend J. Knak Jensen , Imre G. Csizmadia , András Perczel
    Helix compactness and stability: Electron structure calculations of conformer
    Chem. Phys. Lett. 563:80-87. (2013) Kivonat