Critical role of zinc in hardening of Nereis jaws-Reference-Cited by-同舟云学术

Critical role of zinc in hardening of Nereis jaws

Published:2006-08-15 Issue:16 Volume:209 Page:3219-3225
ISSN:1477-9145
Container-title:Journal of Experimental Biology
language:en
Short-container-title:

Author:

Broomell Chris C.¹,Mattoni Mike A.²,Zok Frank W.²,Waite J. Herbert¹

Affiliation:

1. Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Barbara, Santa Barbara, CA 93106, USA

2. Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106, USA

Abstract

SUMMARY Hardening of invertebrate jaws and mandibles has been previously correlated to diverse, potentially complex modifications. Here we demonstrate directly,for the first time, that Zn plays a critical role in the mechanical properties of histidine-rich Nereis jaws. Using nanoindentation, we show that removal of Zn by chelation decreases both hardness and modulus by over 65%. Moreover, reconstitution of Zn yields a substantial recovery of initial properties. Modulus and hardness of Zn-replete jaws exceed those attainable by current engineering polymers by a factor of >3. Zn-mediated histidine cross-links are proposed to account for this enhancement in mechanical properties.

Publisher

The Company of Biologists

Subject

Insect Science,Molecular Biology,Animal Science and Zoology,Aquatic Science,Physiology,Ecology, Evolution, Behavior and Systematics

Link

http://journals.biologists.com/jeb/article-pdf/209/16/3219/1542205/3219.pdf

Reference21 articles.

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4. Birkedal, H., Khan, R. K., Slack, N., Broomell, C.,Lichtenegger, H. C., Zok, F., Stucky, G. D. and Waite, J. H.(2006). Halogenated veneers: protein crosslinking and halogenation in the jaws of Nereis, a marine polychaete worm. Chembiochem, in press.

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