Intrinsically disordered mollusk shell prismatic protein that modulates calcium carbonate crystal growth.

Abstract:

:The formation of calcite prism architecture in the prismatic layer of the mollusk shell involves the participation of a number of different proteins. One protein family, Asprich, has been identified as a participant in amorphous calcium carbonate stabilization and calcite architecture in the prismatic layer of the mollusk, Atrina rigida . However, the functional role(s) of this protein family are not fully understood due to the fact that insufficient quantities of these proteins are available for experimentation. To overcome this problem, we employed stepwise solid-phase synthesis to recreate one of the 10 members of the Asprich family, the 61 AA single chain protein, Asprich "3". We find that the Asprich "3" protein inhibits the formation of rhombohedral calcite crystals and induces the formation of round calcium carbonate deposits in vitro that contain calcite and amorphous calcium carbonate (ACC). This mineralization behavior does not occur under control conditions, and the formation of ACC and calcite is similar to that reported for the recombinant form of the Asprich "g" protein. Circular dichroism studies reveal that Asprich "3" is an intrinsically disordered protein, predominantly random coil (66%), with 20-30% β-strand content, a small percentage of β-turn, and little if any α-helical content. This protein is not extrinsically stabilized by Ca(II) ions but can be stabilized by 2,2,2-trifluoroethanol to form a structure consisting of turn-like and random coil characteristics. This finding suggests that Asprich "3" may require other extrinsic interactions (i.e., with mineral or ionic clusters or other macromolecules) to achieve folding. In conclusion, Asprich "3" possesses in vitro functional and structural qualities that are similar to other reported for other Asprich protein sequences.

journal_name

Biomacromolecules

journal_title

Biomacromolecules

authors

Ndao M,Keene E,Amos FF,Rewari G,Ponce CB,Estroff L,Evans JS

doi

10.1021/bm100738r

subject

Has Abstract

pub_date

2010-10-11 00:00:00

pages

2539-44

issue

10

eissn

1525-7797

issn

1526-4602

journal_volume

11

pub_type

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