Metal binding peptide Z3 targeting cadmium ions and application of metal binding peptide Z3

The invention belongs to the technical field of wastewater treatment and particularly relates to a metal binding peptide Z3 targeting cadmium ions and application of the metal binding peptide Z3. Thesequence of the metal binding peptide Z3 is SEQ ID No.5 and is specifically DYNYDRSDSRLT. The screening technology of a random phage dodecapeptide library is utilized to obtain the dodecapeptide whichhas high cadmium ion affinity and can specifically bind with the cadmium ions, the encoding gene of the binding peptide is further integrated into saccharomyces cerevisiae, a saccharomyces cerevisiaelectin surface display system EBY100 is utilized to display the metal binding peptide capable of specifically adsorbing the cadmium ions on the outer surface of the cell wall of the saccharomyces cerevisiae, and accordingly the saccharomyces cerevisiae with the metal binding peptide can be applied as an adsorbing agent. Preliminary tests show that each gram of wet saccharomyces cerevisiae with metal binding peptide can ads