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Title 

Structural asymmetry of procaspase-7 bound to a specific inhibitor

Authors 

Hyo Jin KangYoung Mi LeeKwang-Hee BaeSeung Jun KimSang Jeon Chung

Publisher 

International Union of Crystallography

Issue Date 

2013

Citation 

Acta Crystallographica. Section D, Biological Crystallography, vol. D69, no. 8, pp. 1514-1521

Keywords 

caspase-7 activationinhibitorsprocaspase-7

Abstract 

Caspase-7 is expressed as a proenzyme and is activated by initiator caspases upon the transmission of cell-death signals. Despite extensive structural and biochemical analyses, many questions regarding the mechanism of caspase-7 activation remain unanswered. Caspase-7 is auto-activated during overexpression in Escherichia coli, even in the absence of initiator caspases, indicating that procaspase-7 has intrinsic catalytic activity. When variants of procaspase-7 with altered L2 loops were prepared, a variant with six inserted amino acids showed meaningful catalytic activity which was inhibited by Ac-DEVD-CHO. The kinetic constants of the procaspase-7 variant were determined and its three-dimensional structure was solved with and without bound inhibitor. The homodimeric procaspase-7 bound to the inhibitor revealed an asymmetry. One monomer formed a complete active site bound to the inhibitor in collaboration with the L2 loop from the other monomer, whereas the other monomer had an incomplete active site despite the bound inhibitor. Consequently, the two L2 loops in homodimeric procaspase-7 served as inherent L2 and L2′ loops forming one complete active site. These data represent the first three-dimensional structure of a procaspase-7 variant bound to a specific inhibitor, Ac-DEVD-CHO, and provide insight into the folding mechanism during caspase-7 activation and the basal activity level of procaspase-7.

Citation 

Acta Crystallographica. Section D, Biological Crystallography, D69(8): 1514-1521

ISSN 

0907-4449

Link 

http://dx.doi.org/10.1107/S0907444913010196

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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