7dws | pdb_00007dws
The structure of T4 Lysozyme I3C/C54T/R125C/E128C complex with Zinc ions
Structural highlights
FunctionENLYS_BPT4 Endolysin with lysozyme activity that degrades host peptidoglycans and participates with the holin and spanin proteins in the sequential events which lead to the programmed host cell lysis releasing the mature viral particles. Once the holin has permeabilized the host cell membrane, the endolysin can reach the periplasm and break down the peptidoglycan layer.[1] Publication Abstract from PubMedThe development of recombinant protein cross-linked injectable hydrogels with good mechanical strength and effective drug loading capacity for bone regeneration is extremely attractive and rarely reported. Here, we report the fabrication of a smart hydrogel delivery system by incorporating a rationally designed T4 lysozyme mutant (T4M) to mediate the localized delivery and synergistic release of Mg(2+) and Zn(2+) for bone repair. Apart from its intrinsic antibacterial properties, T4M bears abundant free amine groups on its surface to function as effective covalent crosslinkers to strengthen the hydrogel network as well as exhibits specific binding affinity to multivalent cations such as Zn(2+). Moreover, the integrin receptor-binding Arg-Gly-Asp (RGD) sequence was introduced onto the C-terminus of T4 lysozyme to improve its cellular affinity and further facilitate rapid tissue regeneration. The final composite hydrogel displays excellent injectability, improved mechanical properties, antibacterial activity, and unique bioactivities. The effective loading of Mg(2+)/Zn(2+) in the hydrogels could mediate the sequential and sustained release of Mg(2+) and Zn(2+), thereby resulting in synergistic enhancement on bone regeneration through modulation of the MAPK signaling pathway. We believe that the strategy proposed in this paper opens up a new route for developing protein cross-linked smart delivery systems for tissue regeneration. Rationally designed protein cross-linked hydrogel for bone regeneration via synergistic release of magnesium and zinc ions.,Chen X, Tan B, Wang S, Tang R, Bao Z, Chen G, Chen S, Tang W, Wang Z, Long C, Lu WW, Yang D, Bian L, Peng S Biomaterials. 2021 May 12;274:120895. doi: 10.1016/j.biomaterials.2021.120895. PMID:34020269[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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