Journal
JOURNAL OF BIOMECHANICS
Volume 38, Issue 7, Pages 1527-1533Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2004.07.011
Keywords
tropocollagen molecule; elastic properties-Young's modulus; steered molecular dynamics; hydrogen bond network; structural stability
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The aim of this report is to investigate at microscopic level the elastic properties of a tropocollagen-like molecule submitted to linear traction along its longitudinal axis. For this purpose, we performed steered molecular dynamics (SMD) simulations for a wide range of spring constants in order to test the molecular response based on a two-spring model connected in series. An elastic behavior was observed in an elongation range of 2.5-4 % of the molecular length, estimating an effective molecular elastic constant of 1.02 +/- 0.20 kcal/mol angstrom(2) in this region. Accordingly, a Young's modulus for the tropocollagen molecule of Y = 4.8 +/- 1.0GPa was calculated. The complex hydrogen bond network was traced along molecular dynamics (MD) and SMD simulations revealing a rearrangement of these interactions preserving the integrity of the molecular structure when submitted to traction. No evidence of the significant role attributed to water bridges for structural stability was detected, on the contrary facts pointed out that the hydrogen bond network might be the responsible. (c) 2004 Elsevier Ltd. All rights reserved.
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