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Calcium binding peptide motifs from calmodulin confer divalent ion selectivity to elastin-like polypeptides.

ABSTRACT: Calcium-sensitive elastin-like polypeptides (CELPs) were synthesized by periodically interspersing a calcium-binding peptide sequence from calmodulin within an elastin-like polypeptide (ELP) with the goal of creating thermal and calcium responsive peptide polymers. The CELPs exhibit high sensitivity to calcium compared to monovalent cations but do not exhibit the exquisite selectivity for calcium over other divalent cations, such as magnesium, that is displayed by calmodulin. The CELPs were further used as a building block for the synthesis of calcium-sensitive nanoparticles by fusing a hydrophilic, noncalcium-sensitive ELP block with a CELP block that becomes more hydrophobic upon calcium binding. We show that addition of calcium at concentrations between 50 and 500 mM imparts sufficient amphiphilicity to the diblock polypeptide between 33 and 46 °C to trigger its self-assembly into monodisperse spherical micelles with a hydrodynamic radius of ?50 nm.

SUBMITTER: Hassouneh W

PROVIDER: S-EPMC3734552 | biostudies-literature | 2013 Jul

REPOSITORIES: biostudies-literature

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Calcium binding peptide motifs from calmodulin confer divalent ion selectivity to elastin-like polypeptides.

Hassouneh Wafa W Nunalee Michelle L ML Shelton M Coleman MC Chilkoti Ashutosh A

Biomacromolecules 20130620 7

Calcium-sensitive elastin-like polypeptides (CELPs) were synthesized by periodically interspersing a calcium-binding peptide sequence from calmodulin within an elastin-like polypeptide (ELP) with the goal of creating thermal and calcium responsive peptide polymers. The CELPs exhibit high sensitivity to calcium compared to monovalent cations but do not exhibit the exquisite selectivity for calcium over other divalent cations, such as magnesium, that is displayed by calmodulin. The CELPs were furt ...[more]

PMID: 23705904

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Project description:BackgroundSafe and effective hemostatic materials are important for reducing mortality resulting from excessive hemorrhage. In this work, new biomaterials with hemostatic effects were created by fusing the gene coding for RADA-16, a self-assembling peptide with the sequence RADARADARADARADA, to the 3'-end of the open reading frame (ORF) encoding elastin-like polypeptides through gene recombination.ResultsThe fusion proteins, termed 36R, 60R and 96R, were solubly over-expressed in Escherichia coli BL21 (DE3) based on genetic manipulation of the high-efficiency prokaryotic expression vector pET28a (+) and bacterial transformation. Western Blot analysis showed that the over-expressed proteins were the target fusion proteins. The target proteins 36R with 94.72% purity, 60R with 96.91% purity and 96R with 96.37% purity were prepared using an inverse phase transition cycle at 65 °C followed by His-tag affinity chromatography. The proliferation results of the mouse fibroblast cell line L929 and hippocampus neuron cell line HT22 indicated that the fusion proteins did not cause obvious cell toxicity. The lyophilized spongy film of the purified 36R, 60R and 96R could stop the hemorrhage of a 2?×?2 mm bleeding wound in the mouse liver after 27.21?±?1.92 s, 18.65?±?1.97 s and 15.85?±?1.21 s, respectively. The hemostasis time was 21.23?±?1.84 s for rat-tail collagen and 14.44?±?1.33 s for RADA-16 lyophilized on gauze. The hemostatic time of three treated groups were all significantly superior to that of the negative control without any hemostasis treatment, which spontaneously stopped bleeding after 37.64?±?1.34 s. Statistical analysis showed that the spongy film with purified 96R exhibited an exciting hemostatic effect that was superior to rat-tail collagen and close to that of RADA-16 lyophilized on gauze.ConclusionsThese results revealed that the fusion proteins achieved by gene recombination technology could serve as a promising hemostatic material.

Dataset Information

Calcium binding peptide motifs from calmodulin confer divalent ion selectivity to elastin-like polypeptides.

Publications

Calcium binding peptide motifs from calmodulin confer divalent ion selectivity to elastin-like polypeptides.

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