Multilayer films, coatings, and microcapsules comprising polypeptides

1. A multilayer film, said film comprising two or more layers of polyelectrolytes, wherein adjacent layers comprise oppositely charged polyelectrolytes,

wherein a first layer polyelectrolyte comprises a composite polypeptide comprising one or more non-homopolymer surface adsorption regions covalently linked to one or more functional regions forming a single polypeptide chain, wherein the composite polypeptide and the one or more non-homopolymer surface adsorption regions have the same polarity,

wherein the one or more non-homopolymer surface adsorption regions comprise one or more amino acid sequence motifs, the one or more amino acid sequence motifs consisting of 5 to 15 amino acid residues and having a magnitude of net charge per residue at neutral pH of greater than or equal to 0.4, and

wherein the one or more functional regions comprise 3 to about 250 amino acid residues, and are selected from the group consisting of a cysteine-containing sequence, a sequence for extracellular matrix recognition, a phosphotyrosine binding domain, a Src homology 2 domain, a protein tyrosine phosphatase domain, an N-linked glycosylation substrate sequence, an O-linked glycosylation substrate sequence, a protease recognition site, an antimicrobial peptide sequence, and a BAG domain, and

wherein the composite polypeptide is an unbranched polypeptide, is not a homopolymer, is at least 15 amino acid residues long, and has an aqueous solubility at pH 4 to 10 of greater than 50 μg/mL;

wherein a second layer comprises a second layer polyelectrolyte comprising a polycationic material or a polyanionic material having a molecular weight of greater than 1,000 and at least 5 charges per molecule, and a charge opposite that of the first layer polypeptide.

2. The multilayer film of claim 1 , wherein the composite polypeptide has an aqueous solubility of greater than or equal to about 1 mg/mL.

3. The multilayer film of claim 1 , wherein the one or more functional regions comprise 3 to about 50 amino acid residues, and wherein the composite polypeptide has a magnitude of net charge per residue at neutral pH of greater than or equal to 0.4.

4. The multilayer film of claim 1 , wherein the one or more functional regions comprise about 50 to about 250 amino acid residues.

5. The multilayer film of claim 4 , wherein the one or more functional regions have a water solubility at pH 4 to 10 of greater than 50 μg/mL.

6. The multilayer film of claim 5 , wherein the one or more functional regions have a water solubility at pH 4 to 10 of greater than or equal to 1 mg/mL.

7. The multilayer film of claim 4 , wherein composite polypeptide comprises at least two amino acid sequence motifs.

8. The multilayer film of claim 1 , wherein the polycationic material comprises a polyamine.

9. The multilayer film of claim 8 , wherein the polyamine comprises polyvinyl amine, poly(aminostyrene), poly(aminoacrylate), poly(N-methyl aminoacrylate), poly(N-ethylaminoacrylate), poly(N,N-dimethyl aminoacrylate), poly(N,N-diethylaminoacrylate), poly(aminomethacrylate), poly(N-methyl amino-methacrylate), poly(N-ethyl aminomethacrylate), poly(N,N-dimethyl aminomethacrylate), poly(N,N-diethyl aminomethacrylate), poly(ethyleneimine), poly(diallyl dimethylammonium chloride), poly(N,N,N-trimethylaminoacrylate chloride), poly(methyacrylamidopropyltrimethyl ammonium chloride), chitosan and combinations comprising one or more of the foregoing polycationic materials.

10. The multilayer film of claim 1 , wherein the polyanionic material comprises a nucleic acid, alginate, carrageenan, furcellaran, pectin, xanthan, hyaluronic acid, heparin, heparan sulfate, chondroitin sulfate, dermatan sulfate, dextran sulfate, poly(meth)acrylic acid, oxidized cellulose, carboxymethyl cellulose, acidic polysaccharides, and crosmarmelose, and combinations comprising one or more of the foregoing polyanionic materials.

11. The multilayer film of claim 1 , wherein the film is in the form of a microcapsule.

12. The multilayer film of claim 11 , wherein the microcapsule comprises a core, and the core comprises a protein, a drug, or a combination thereof.

13. The multilayer film of claim 12 , wherein the protein or drug is in crystallized form.

14. The multilayer film of claim 12 , wherein the protein or drug is in liquid form.

15. The multilayer film of claim 1 , comprising at least 4 pairs of alternately charged layers.

16. The multilayer film of claim 1 , having a thickness of 1 nm to 100 nm.

17. The multilayer film of claim 1 , wherein the film is formed on a substrate.

18. The multilayer film of claim 17 , wherein the substrate comprises a medical device.

19. The multilayer film of claim 1 , wherein the first layer polypeptide comprises at least one amino acid sequence motif that is present in the human proteome.

20. The multilayer film of claim 1 , wherein the composite polypeptide comprises two non-homopolymer surface adsorption regions flanking a functional region.

21. The multilayer film of claim 1 , wherein the second layer polyelectrolyte comprises a second layer polypeptide,

wherein the second layer polypeptide is not a hompolymer, is at least 15 amino acids long, and has a magnitude of net charge per residue at neutral pH of greater than or equal to 0.4.

22. The multilayer film of claim 1 , wherein the one or more functional regions comprise a cysteine-containing sequence, a sequence for extracellular matrix recognition, a phosphotyrosine binding domain, a Src homology 2 domain, an N-linked glycosylation substrate sequence, an O-linked glycosylation substrate sequence, a protease recognition site, or an antimicrobial peptide sequence.

23. The multilayer film of claim 1 , wherein the one or more functional region comprise an antimicrobial peptide sequence.