Exploring binding sites other than the catalytic core in the crystal structure of the catalytic domain of MKP-4

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Title
Exploring binding sites other than the catalytic core in the crystal structure of the catalytic domain of MKP-4
Author(s)
Dae Gwin JeongTae-Sung Yoon; S K Jung; Byoung Chul Park; H Park; S E Ryu; Seung Jun Kim
Bibliographic Citation
Acta Crystallographica Section D-Biological Crystallography, vol. 67, no. 1, pp. 25-31
Publication Year
2011
Abstract
Map kinase phosphatase 4 (MKP-4), which has been implicated in signalling pathways that negatively regulate glucose uptake, belongs to the dual-specificity phosphatase (DUSP) family. An inherent property of MKPs is an ability to undergo structural rearrangement, transitioning from a partially active to a fully active conformation. Here, a 2.7 A resolution crystal structure of the catalytic domain of MKP-4 (MKP-4C) is presented. It was determined that the MKP-4C structure seriously deviates from canonical conformations of DUSPs and this characteristic feature results in significant gaps between the catalytic core and several surrounding loops which are unique compared with other MKP counterparts that adopt an active conformation. Using virtual library screening, it was found that inhibitors bind to MKP-4C with high affinity near these gaps. Inhibitors that target other binding sites instead of the active site can be utilized to prevent transition to a fully active conformation. Compounds that are able to make contacts with these sites in MKP-4 would not only provide a beneficial increase in affinity but may also permit greater specificity relative to other protein tyrosine phosphatases.
Keyword
dual-specificity phosphatasesmap kinase phosphatase 4catalytic domain
ISSN
0907-4449
Publisher
Int Union Crystallography
DOI
http://dx.doi.org/10.1107/S0907444910042381
Type
Article
Appears in Collections:
Division of Research on National Challenges > Bionanotechnology Research Center > 1. Journal Articles
Critical Diseases Diagnostics Convergence Research Center > 1. Journal Articles
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