The invention relates to an artificial forisome body which comprises a fusion protein consisting of at least one SEO-F protein or a section thereof that comprises at least 50 amino acids, and at least one additional protein or peptide with the exception of the GFP and Venus proteins, in which (a) said additional protein or peptide has a mass of no more than 30 kDa, and/or (b) the forisome body also comprises a non-fusion SEO-F protein or a form of this protein that is C-terminally deleted by up to 45 amino acids and/or N-terminally deleted by up to 13 amino acids, the non-fusion SEO-F protein being selected from those proteins which have the property of being able to form homomeric forisome bodies in the absence of additional SEO-F proteins, or (c) the additional protein or peptide is a section of a second SEO-F protein provided that one of the two SEO-F proteins, in a non-fusion form, is capable of forming homomeric forisome bodies, and the fusion protein consists of an N-terminal SEO-F protein section and a C-terminal SEO-F protein section, said sections constituting an SEO-F protein that is complete or C-terminally deleted by up to 50 amino acids and/or N-terminally deleted by up to 13 amino acids, provided that, if required, any number of the four cysteines present in the native SEO-F proteins in the C-terminal section between AS 600 and AS 670 may be exchanged for amino acids that are unable to form an S-S bridge bond. The invention also relates to a plant cell or yeast cell comprising a vector that codes for the given fusion protein and, if required, also for the non-fusion SEO-F protein or its deleted form as defined in (b), as well as to a vector that can be multiplied in a yeast cell and that comprises a section which codes for the given fusion protein. The artificial forisome body of the invention is suitable for protein-chemical purposes, in particular for providing immobilised enzymes, antibodies, antigens and such proteins or peptides that can be immobilised, on a substrate, on the basis of an affinity reaction with a substrate-bound biological or biochemically-produced material.