A mussel-derived one component adhesive coacervate.

TitleA mussel-derived one component adhesive coacervate.
Publication TypeJournal Article
Year of Publication2014
AuthorsWei, W, Tan, Y, Rodriguez, NRMartinez, Yu, J, Israelachvili, JN, Waite, JH
JournalActa Biomater
Date Published2014 Apr
KeywordsAdhesiveness, Adsorption, Amino Acid Sequence, Animals, Bivalvia, Buffers, Durapatite, Hydrogen-Ion Concentration, Molecular Sequence Data, Nephelometry and Turbidimetry, Osmolar Concentration, Proteins, Quartz Crystal Microbalance Techniques, Spectrum Analysis, Temperature, Time Factors, Wettability

Marine organisms process and deliver many of their underwater coatings and adhesives as complex fluids. In marine mussels one such fluid, secreted during the formation of adhesive plaques, consists of a concentrated colloidal suspension of a mussel foot protein (mfp) known as Mfp-3S. The results of this study suggest that Mfp-3S becomes a complex fluid by a liquid-liquid phase separation from equilibrium solution at a pH and ionic strength reminiscent of the conditions created by the mussel foot during plaque formation. The pH dependence of phase separation and its sensitivity indicate that inter-/intra-molecular electrostatic interactions are partially responsible for driving the phase separation. Hydrophobic interactions between the non- polar Mfp-3S proteins provide another important driving force for coacervation. As complex coacervation typically results from charge-charge interactions between polyanions and polycations, Mfp-3S is thus unique in being the only known protein that coacervates with itself. The Mfp-3S coacervate was shown to have an effective interfacial energy of ⩽1mJm(-2), which explains its tendency to spread over or engulf most surfaces. Of particular interest to biomedical applications is the extremely high adsorption capacity of coacervated Mfp-3S on hydroxyapatite.

Alternate JournalActa Biomater
PubMed ID24060881
PubMed Central IDPMC3960351
Grant ListR01 DE018468 / DE / NIDCR NIH HHS / United States
R01 DE018468 / DE / NIDCR NIH HHS / United States