Download Adhesive Interactions of Mussel Foot Proteins by Jing Yu PDF

By Jing Yu

ISBN-10: 3319060309

ISBN-13: 9783319060309

Water and moisture undermine robust adhesion to polar surfaces. Marine mussels, despite the fact that, in achieving sturdy underwater adhesion utilizing a set of proteins which are atypical in having excessive degrees of three, 4-dihydroxyphenylalanine (Dopa). Mussel adhesion has encouraged quite a few stories on constructing the following iteration of rainy adhesives. This thesis offers contemporary growth in knowing the elemental floor and intermolecular interactions hired through mussels to accomplish powerful and sturdy rainy adhesion. the outside forces gear (SFA) and diverse different recommendations have been utilized to degree the interactions among mussel foot protein-3 fast (Mfp-3 fast) and the version substrate, mica, in addition to the interactions among quite a few mussel adhesive proteins. the implications during this thesis express that Dopa performs a vital position in mussel adhesion and that mussels delicately keep watch over the interfacial redox setting to accomplish robust and sturdy Dopa mediated adhesion. The interaction among Dopa and hydrophobic interactions is usually obvious in mussel adhesion.

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Extra resources for Adhesive Interactions of Mussel Foot Proteins

Example text

5 differed by an order of magnitude in two reports [3, 13]. The holdfast or byssus of a California mussel (Mytilus californianus Conrad) resembles a bundle of threads, each of which is distally tipped with a flared adhesive plaque (Fig. 1a). About ten plaque proteins have been characterized and half of these are unique to the plaque whereas the others are distributed in both threads and plaques [14]. The mussel assembles each new plaque in a few minutes from proteins stockpiled in its foot. The first proteins the foot squirts onto the surface of a rock are mussel foot proteins Mfp-3 and Mfp-5 with Dopa contents of 20 mol% and 30 mol%, respectively [1, 2] (Fig.

At 600 pmol periodate, adhesion is essentially abolished. 5 during approach. 5 (Fig. 3a). The greater repulsion at higher pH could reflect Mfp-3 cross-linking [23] and/or the tautomerization of peptidyl-Dopaquinone to α,β-dehydrodopa, which would have the effect of locking the peptide backbone into a planar double bond at every oxidized Dopa residue [21, 24]. Given its reversibility, tautomerization is the more plausible explanation. Compliant protein chains pulled out normal to the mica surface during separation would be stiffened during the pH-induced oxidation and tautomerization steps, and the stiffened chains would begin resisting compression earlier during the next approach.

2 The Adhesion Properties of Mfp-3 Fast on Mica A strong adhesion force ~12 mN/m equivalent to an adhesion energy of −2 mJ/m2 was measured at pH 3 during separation of two Mfp-3 films after a 1 min compression (Fig. 2a). Strong adhesion is also consistent with the abrupt jumping apart of two surfaces as manifested by the rapid movement of the fringes of equal chromatic order (FECO). 2 The Adhesion Properties of Mfp-3 Fast on Mica 23 Fig. 2 Mfp-3 adhesion and Dopa oxidation. (a) The adhesion force of Mfp-3 at pH 3 with three successive approach and separation cycles.

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