Abstract: The invention concerns novel streptavidin muteins. In one embodiment such a the mutein (a) contains at least two cysteine residues in the region of the amino acid positions 44 to 53 with reference to the amino acid sequence of wild type streptavidin as set forth at SEQ ID NO: 212 and (b) has a higher binding affinity than (i) a streptavidin mutein “1” (SEQ ID NO: 112) that comprises the amino acid sequence Val44-Thr45-Ala46-Arg47 (SEQ ID NO: 98), or (ii) wild type-streptavidin of which amino acid residues 14 to 139 are shown as SEQ ID NO: 212 for peptide ligands comprising the amino acid sequence Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 100).

Abstract: The invention concerns novel streptavidin muteins. In one embodiment such a mutein (a) contains two or more mutations in the region of the amino acid positions 117 to 121 with reference to the amino acid sequence of wild type streptavidin of which amino acid residues 14 to 139 are as set forth at SEQ ID NO:212 and (b) has a higher binding affinity than each of (i) a streptavidin mutein “1” (SEQ ID NO: 16) that comprises the amino acid sequence Val44-Thr45-Ala46-Arg47 (SEQ ID NO: 98), or (ii) wild type-streptavidin of which amino acid residues 14 to 139 are shown as SEQ ID NO: 212 for peptide ligands comprising the amino acid sequence Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 100).

Abstract: The invention concerns novel streptavidin muteins and their use for determination, isolation or purification of proteins under denaturing conditions. In one embodiment such a mutein has an Cys residue at sequence position 127 of the wild-type sequence of streptavidin and comprises at least one mutation in the region of the amino acid positions 115 to 121 with reference to the amino acid sequence of wild type streptavidin.

Abstract: The invention concerns novel streptavidin muteins. In one embodiment such a mutein (a) contains two or more mutations in the region of the amino acid positions 117 to 121 with reference to the amino acid sequence of wild type streptavidin of which amino acid residues 14 to 139 are as set forth at SEQ ID NO:212 and (b) has a higher binding affinity than each of (i) a streptavidin mutein “1” (SEQ ID NO: 16) that comprises the amino acid sequence Val44-Thr45-Ala46-Arg47 (SEQ ID NO: 98), or (ii) wild type-streptavidin of which amino acid residues 14 to 139 are shown as SEQ ID NO: 212 for peptide ligands comprising the amino acid sequence Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 100).

Abstract: The invention concerns novel streptavidin muteins. In one embodiment such a mutein (a) contains at least one mutation in the region of the amino acid positions 115 to 121 with reference to the amino acid sequence of wild type streptavidin as set forth at SEQ ID NO: 15 and (b) has a higher binding affinity than each of (i) a streptavidin mutein that comprises the amino acid sequence Val44-Thr45-Ala46-Arg47 (SEQ ID NO: 98), or (ii) a streptavidin mutein that comprises the amino acid sequence He44-Gly45-Ala46-Arg47 (SEQ ID NO: 99) at amino acid positions 44 to 47, or (iii) wild type-streptavidin (SEQ ID NO: 15) for peptide ligands comprising the amino acid sequence Trp-Ser-His-Pro-Gln-Phe-Glu-Lys (SEQ ID NO: 100).

Abstract: The present invention relates to methods of treating a subject with a population of target cells defined by the presence of a specific receptor molecule on the surface; wherein the population of target cells is isolated by a method of reversibly staining the target cells with a detectable label.

Abstract: The present invention relates to methods of reversibly staining a target cell. The invention also relates to methods of isolating a target cell or a target cell population that is defined by the presence of at least one common specific receptor molecule. The invention also provides kits that can be used to carry out the methods of the invention.

Abstract: The present invention relates to methods of reversibly staining a target cell. The invention also relates to methods of isolating a target cell or a target cell population that is defined by the presence of at least one common specific receptor molecule. The invention also provides kits that can be used to carry out the methods of the invention.

Abstract: The present invention relates to sequentially arranged streptavidin-binding binding modules which may in particular be used as affinity tags. The affinity tags comprise at least two individual modules capable of mediating avidic binding to streptavidin.

Abstract: The present invention relates to a new method for reversible staining and functional isolation or characterization of cells, e.g. antigen-specific T cells. With this technique, the original functional status of cells can be substantially maintained after their identification and purification. Thus, this new method is of broad benefit for basic research and clinical applications.

Abstract: The present invention relates to sequentially arranged streptavidin-binding binding modules which may in particular be used as affinity tags. The affinity tags comprise at least two individual modules capable of mediating avidic binding to streptavidin.

Abstract: The present invention relates to a new method for reversible staining and functional isolation or characterization of cells, e.g. antigen-specific T cells. With this technique, the original functional status of cells can be substantially maintained after their identification and purification. Thus, this new method is of broad benefit for basic research and clinical applications.