The present invention is directed to recombinant spider silk proteins, nucleic acids, coding for these recombinant spider silk proteins, as well as hosts suitable for expressing those nucleic acids. Furthermore, the present invention is directed to a method of aggregation of spider silk proteins and the use of the proteins in the field of biotechnology and/or medicine and other industrial fields, in particular in the manufacture of automotive parts, in the aircraft construction, in the processing of textiles and leather, as well as in the manufacture and processing of paper and the like.
