Long uniform recombinant protein fibers

1. A long uniform recombinant protein fiber, comprising:

a continuous fiber length of at least 600 m, wherein the mean properties along the length of the fiber comprise:

a tenacity greater than or equal to 12 cN/tex;

a linear density less than or equal to 6 dtex;

a coefficient of variation of tenacity less than 15%; and

a coefficient of variation of linear density less than 20%,

wherein the tenacity is measured using ASTM D3822-14, and the linear density is measured using ASTM D1577;

wherein the recombinant protein fiber comprises a protein sequence comprising repeat units, wherein

each repeat unit has at least 95% sequence identity to a sequence that comprises from 2 to 20 quasi-repeat units,

each quasi-repeat unit comprising a polypeptide of {GGY-[GPG-X 1 ] n1 -GPS-(A) n2 } (SEQ ID NO: 111), wherein for each quasi-repeat unit: X 1 is independently selected from the group consisting of SGGQQ (SEQ ID NO: 100), GAGQQ (SEQ ID NO: 101), GQGPY (SEQ ID NO: 102), AGQQ (SEQ ID NO: 103), and SQ; n1 is from 4 to 8; and n2 is from 6 to 10.

2. The recombinant protein fiber of claim 1 , wherein the length is at least 650 m.

3. The recombinant protein fiber of claim 1 , wherein the tenacity has a coefficient of variation less than 10% along the length.

4. The recombinant protein fiber of claim 1 , wherein the linear density has a coefficient of variation less than 15% along the length.

5. The recombinant protein fiber of claim 1 , wherein the mean elongation at break is greater than 25% and the elongation at break has a coefficient of variation of less than 35% along the length.

6. The recombinant protein fiber of claim 1 , wherein the mean initial modulus is greater than 480 cN/tex and the initial modulus has a coefficient of variation of less than 5% along the length.

7. The recombinant protein fiber of claim 1 , wherein the mean elongation is greater than 24% and the elongation has a coefficient of variation of less than 45% along the length.

8. The recombinant protein fiber of claim 1 , wherein the mean work of rupture is greater than 3 cN*cm and the work of rupture has a coefficient of variation of less than 50% along the length.

9. The recombinant protein fiber of claim 1 , wherein the mean force at rupture is greater than 7 cN and the force at rupture has a coefficient of variation less than 25% along the length.

10. The recombinant protein fiber of claim 1 , wherein the recombinant protein fiber is produced by wet spinning a dope comprising a recombinant protein powder dissolved in a spinning solution.

11. The recombinant protein fiber of claim 10 , wherein the recombinant protein powder is less than 65% proteinaceous block copolymer by mass.

12. The recombinant protein fiber of claim 1 , wherein n1 is from 4 to 5 for at least half of the quasi-repeat units.

13. The recombinant protein fiber of claim 1 , wherein n2 is from 5 to 8 for at least half of the quasi-repeat units.

14. The recombinant protein fiber of claim 1 , wherein the repeat unit comprises alanine-rich regions and glycine-rich regions, wherein:

the alanine-rich regions form a plurality of nanocrystalline beta-sheets; and

the glycine-rich regions form a plurality of beta-turn structures.

15. The recombinant protein fiber of claim 1 , wherein the repeat unit comprises SEQ ID NO: 1.

16. The recombinant protein fiber of claim 1 , wherein the linear density and the tenacity are measured using FAVIMAT fiber tensile test equipment model Favimat+ and Robot2.

17. A yarn comprising the recombinant protein fiber of claim 1 , wherein the yarn is a filament yarn.

18. A textile comprising the yarn of claim 17 , wherein the textile is a knitted textile.

19. The textile of claim 18 , wherein the textile is selected from the group consisting of a circular-knitted textile, a flat-knitted textile, and a warp-knitted textiles.

20. A textile comprising the yarn of claim 17 , wherein the textile is a woven textile.

21. The textile of claim 20 , wherein the textile is selected from the group consisting of a plain weave textile, a dobby weave textile, and a jacquard weave textile.

22. A textile comprising the yarn of claim 17 , wherein the textile is a non-woven textile.

23. The textile of claim 22 , wherein the textile is selected from the group consisting of a needle punched textile, a spunlace textile, a wet-laid textile, a dry-laid textile, a melt-blown textile, and a 3-D printed non-woven textile.

24. A yarn comprising the recombinant protein fiber of claim 1 , wherein the yarn is a spun yarn.

25. A yarn comprising the recombinant protein fiber of claim 1 , wherein the yarn is a blended yarn.