We have investigated the mechanical properties of the zona pellucida ZP, a multilayer glycoprotein coat that surrounds mammalian eggs, using atomic force spectroscopy. The response of the membrane to mechanical stress has been reconstructed using a modified Hertz model. The transition from elastic behavior, which occurs when low stress forces are applied characterized by a Young’s modulus E=225 kPa, toward plastic behavior is observed. The critical indentation necessary to induce plastic deformations occurs at yield=55050 nm. This high critical value, corresponding to two ZP layers, well supports the noncovalent long lifetimes of interactions that take place between constituent glycoproteins.
Evidence of elastic to plastic transition in the zona pellucida of oocytes using atomic force spectroscopy
SYLLA, LakamyWriting – Original Draft Preparation
;MONACI, MaurizioWriting – Original Draft Preparation
;
2009
Abstract
We have investigated the mechanical properties of the zona pellucida ZP, a multilayer glycoprotein coat that surrounds mammalian eggs, using atomic force spectroscopy. The response of the membrane to mechanical stress has been reconstructed using a modified Hertz model. The transition from elastic behavior, which occurs when low stress forces are applied characterized by a Young’s modulus E=225 kPa, toward plastic behavior is observed. The critical indentation necessary to induce plastic deformations occurs at yield=55050 nm. This high critical value, corresponding to two ZP layers, well supports the noncovalent long lifetimes of interactions that take place between constituent glycoproteins.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.