the present invention relates to a biopolymer , bioactive and totally biocompatible , very fluid at ambient temperature , capable of gelling in a sudden manner at 37 ° c ., forming a solid implant , structurally integral and continuous having high mechanical properties . the biopolymer comprises at least a bioactive domain capable of directing in a precise manner the formation of a solid or semisolid implant . furthermore the invention relates to any of the nucleic acids encoding the amino acid sequence of the biopolymer , implants , pharmaceutically acceptable vehicles , uses thereof , and a method of synthesis thereof .