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. Author manuscript; available in PMC: 2020 Nov 18.
Published in final edited form as: Chem Rev. 2020 Aug 20;120(19):10834–10886. doi: 10.1021/acs.chemrev.0c00015

Figure 12.

Figure 12.

(A) 4-Arm PEG-His forms hydrogel networks with Ni2+, Cu2+, or Co2+ ions based on His-M2+ coordination complexes formation. (B) Viscoelastic properties of PEG-His-M2+ hydrogels controlled by longwave low-intensity UV irradiation (365 nm). Reprinted with permission from ref241. Copyright 2017 The Royal Society of Chemistry. (C) Schematic showing the protein network assembled by SpyTag/SpyCatcher chemistry and Co/His6-tag coordination. AA, SpyTag-ELP-SpyTag. BB, SpyCatcher-ELP-SpyCatcher. ELP, elastin-like polypeptide. (D, E) Dynamic frequency sweep tests on the products of AA + BB + Co2+ and AA + BB + Co2+ + NaIO4 with a fixed strain of 5%. The concentration of Co2+ is 3 mM. The insets show the products of AA + BB + Co2+ in the absence and presence of NaIO4. Reprinted with permission from ref239. Copyright 2019 American Chemical Society.