Engineering a zinc binding site into the de novo designed protein DS119 with a βαβ structure

Abstract

Functional proteins designed de novo have potential application in chemical engineering, agriculture and healthcare. Metal binding sites are commonly used to incorporate functions. Based on a de novo designed protein DS119 with a βαβ structure, we have computationally engineered zinc binding sites into it using a home-made searching program. Seven out of the eight designed sequences tested were shown to bind Zn2+ with micromolar affinity, and one of them bound Zn2+ with 1:1 stoichiometry. This is the first time that metalloproteins with an α, β mixed structure have been designed from scratch. © 2011 Higher Education Press and Springer-Verlag Berlin Heidelberg.