Effect of Circular Permutation on the Structure and Function of Type 1 Blue Copper Center in Azurin

Overview

Journal Protein Sci

Specialty Biochemistry

Date 2016 Nov 5

PMID 27759897

Citations 5

Authors

Yang Yu

Igor D Petrik

Kelly N Chacon

Parisa Hosseinzadeh

Honghui Chen

Ninian J Blackburn

Yi Lu

Affiliations

Soon will be listed here.

Abstract

Type 1 copper (T1Cu) proteins are electron transfer (ET) proteins involved in many important biological processes. While the effects of changing primary and secondary coordination spheres in the T1Cu ET function have been extensively studied, few report has explored the effect of the overall protein structural perturbation on active site configuration or reduction potential of the protein, even though the protein scaffold has been proposed to play a critical role in enforcing the entatic or "rack-induced" state for ET functions. We herein report circular permutation of azurin by linking the N- and C-termini and creating new termini in the loops between 1 and 2 β strands or between 3 and 4 β strands. Characterization by electronic absorption, electron paramagnetic spectroscopies, as well as crystallography and cyclic voltammetry revealed that, while the overall structure and the primary coordination sphere of the circular permutated azurins remain the same as those of native azurin, their reduction potentials increased by 18 and 124 mV over that of WTAz. Such increases in reduction potentials can be attributed to subtle differences in the hydrogen-bonding network in secondary coordination sphere around the T1Cu center.

Citing Articles

Circular permutation at azurin's active site slows down its folding.

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