α-Helix-to-random coil transition of two-chain, coiled coils. Theory and experiments for thermal denaturation of α-tropomyosin

1983 ◽  
Vol 16 (2) ◽  
pp. 173-180 ◽  
Author(s):  
Marilyn Emerson Holtzer ◽  
Alfred Holtzer ◽  
Jeffrey Skolnick
Keyword(s):  
Thermal Denaturation ◽  
Coiled Coils ◽  
Random Coil ◽  
Coil Transition ◽  
Α Helix ◽  
Theory And Experiments

.alpha.-Helix-to-random coil transition of two-chain, coiled coils. Light scattering experiments on the thermal denaturation of .alpha.-tropomyosin

1985 ◽  
Vol 18 (6) ◽  
pp. 1083-1086 ◽  
Author(s):  
S. Yukioka ◽  
Ichiro Noda ◽  
Mitsuru Nagasawa ◽  
Marilyn Emerson Holtzer ◽  
Alfred Holtzer
Keyword(s):  
Light Scattering ◽  
Thermal Denaturation ◽  
Alpha Helix ◽  
Coiled Coils ◽  
Random Coil ◽  
Coil Transition

CONFORMATION AND PHASE TRANSITION OF POLY-GLUTAMINE

2006 ◽  
Vol 17 (02) ◽  
pp. 235-246 ◽  
Author(s):  
GÖKHAN GÖKOĞLU ◽  
TARIK ÇELİK
Keyword(s):  
Low Temperatures ◽  
Low Energy ◽  
Random Coil ◽  
Polyglutamine Diseases ◽  
Aggregate Formation ◽  
Two Phase ◽  
Coil Transition ◽  
Energy Stable ◽  
Α Helix ◽  
Β Sheet

In order to provide insights into the misfolding mechanism and the subsequent aggregate formation which cause what are known as the neurodegenerative polyglutamine diseases, we have simulated a 10-residue polyglutamine (poly-Q) chain in vacuum and in solvent by multicanonical method, which enabled us to study the system in a wide temperature range and discuss thermodynamic properties. It is understood that the system in vacuum shows two phase transitions, first of them occur at high temperature that is the well-known helix-coil transition and the second one is a solid-solid transition. However, the poly-Q chain in solvent is in a random coil state at higher temperatures, goes through a conformational change at T = 200 K and assumes predominantly a mixture of anti-parallel β-sheet and α-helix structures at low temperatures. One-residue glutamine dipeptide is also simulated and low-energy stable conformations are identified.

Intramolecular α-helix-β-structure-random coil transition in polypeptides

1982 ◽  
Vol 16 (4) ◽  
pp. 275-285 ◽  
Author(s):  
Hiromitsu Wakana ◽  
Takao Shigaki ◽  
Nobuhiko Saitô
Keyword(s):  
Random Coil ◽  
Coil Transition ◽  
Α Helix
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