Proteinaceous polymers having repetitive units from naturally occurring structural proteins are employed as backbones for functionalities for crosslinking to provide strongly adherent tissue adhesives and sealants. Particularly, block copolymers having repeating units of elastin and fibroin are employed having lysine substitutions in spaced apart units, where the amino group can be crosslinked using difunctional crosslinking agents. The protein polymer contains at least 40 weight percent of repetitive units of 3 to 30 amino acids of at least one naturally occurring structural protein and at least two functional groups capable of reacting with a crosslinking agent to form a strongly adherent adhesive composition for bonding together separated tissue or for sealing tissue defects. A preferred adhesive composition contains glutaraldehyde or polymethylene diisocyanate and a protein block copolymer of at least 30 kD containing at least 70 weight percent of repetitive units of Gly-Ala-Gly-Ala-Gly-Ser and Gly-Val-Gly-Val-Pro, where in at least two units an amino acid is substituted with one of lysine or arginine, and the copolymer has a lysine and arginine equivalent weight in the range of 3 to 15 kD. The protein polymer is produced by recombinant DNA technology, and a kit may be formed containing the crosslinking agent and protein polymer.
蛋白质聚合物具有来自天然结构蛋白的重复单元,被用作交联功能的骨架,以提供具有很强粘附性的组织粘合剂和密封剂。具体来说,采用具有
弹性蛋白和丝蛋白重复单元的嵌段共聚物,其中间隔单元中有赖
氨酸取代,
氨基团可使用双官能
交联剂进行交联。蛋白质聚合物含有至少40重量百分比的至少一种天然结构蛋白的3到30个
氨基酸重复单元,并且至少有两个能够与
交联剂反应形成具有很强粘附性的粘合剂组成的功能基团,用于将分离的组织粘合在一起或用于封闭组织缺陷。优选的粘合剂组成包含
戊二醛或聚甲二
异氰酸酯,以及至少含有30 kD的蛋白质嵌段共聚物,其中至少70重量百分比的重复单元为Gly-Ala-Gly-Ala-Gly-Ser和Gly-Val-Gly-Val-Pro,其中至少两个单元的
氨基酸被赖
氨酸或精
氨酸之一取代,共聚物的赖
氨酸和精
氨酸当量重量在3到15 kD范围内。蛋白质聚合物是通过
重组DNA技术生产的,可以形成一个包含
交联剂和蛋白质聚合物的工具包。