%0 Journal Article %1 franz2017binding %A Franz, E. %A Knape, M. J. %A Herberg, F. W. %D 2018 %J ACS Infect. Dis. %K herberg myown %N 3 %P 415-423 %R 10.1021/acsinfecdis.7b00222 %T cGMP binding domain D mediates a unique activation mechanism in Plasmodium falciparum PKG %U http://pubs.acs.org/doi/10.1021/acsinfecdis.7b00222 %V 4 %X cGMP-dependent protein kinase from Plasmodium falciparum (PfPKG) plays a crucial role in the sexual as well as the asexual proliferation of this human malaria causing parasite. However, function and regulation of PfPKG are largely unknown. Previous studies showed that the domain organization of PfPKG significantly differs from human PKG (hPKG) and indicated a critical role of the cyclic nucleotide binding domain D (CNB D). We identified a novel mechanism, where the CNB-D controls activation and regulation of the parasite specific protein kinase. Here, kinase activity is not dependent on a pseudosubstrate autoinhibitory sequence (IS), as reported for human PKG. A construct lacking the putative IS and containing only the CNB D and the catalytic domain is inactive in the absence of cGMP and can efficiently be activated with cGMP. Based on structural evidence, we describe a regulatory mechanism, whereby cGMP binding to CNB-D induces a conformational change involving the αC helix of the CNB D. The inactive state is defined by a unique interaction between Asp597 of the catalytic domain and Arg528 of the αC helix. The same arginine (R528), however, stabilizes cGMP binding by interacting with Tyr480 of the phosphate binding cassette (PBC). This represents the active state of PfPKG. Our results unveil fundamental differences in the activation mechanism between PfPKG and hPKG, building the basis for the development of strategies for targeted drug design in fighting malaria.

@article{franz2017binding, abstract = { cGMP-dependent protein kinase from Plasmodium falciparum (PfPKG) plays a crucial role in the sexual as well as the asexual proliferation of this human malaria causing parasite. However, function and regulation of PfPKG are largely unknown. Previous studies showed that the domain organization of PfPKG significantly differs from human PKG (hPKG) and indicated a critical role of the cyclic nucleotide binding domain D (CNB D). We identified a novel mechanism, where the CNB-D controls activation and regulation of the parasite specific protein kinase. Here, kinase activity is not dependent on a pseudosubstrate autoinhibitory sequence (IS), as reported for human PKG. A construct lacking the putative IS and containing only the CNB D and the catalytic domain is inactive in the absence of cGMP and can efficiently be activated with cGMP. Based on structural evidence, we describe a regulatory mechanism, whereby cGMP binding to CNB-D induces a conformational change involving the αC helix of the CNB D. The inactive state is defined by a unique interaction between Asp597 of the catalytic domain and Arg528 of the αC helix. The same arginine (R528), however, stabilizes cGMP binding by interacting with Tyr480 of the phosphate binding cassette (PBC). This represents the active state of PfPKG. Our results unveil fundamental differences in the activation mechanism between PfPKG and hPKG, building the basis for the development of strategies for targeted drug design in fighting malaria.}, added-at = {2017-12-19T11:20:22.000+0100}, author = {Franz, E. and Knape, M. J. and Herberg, F. W.}, biburl = {https://www.bibsonomy.org/bibtex/2cd98559a53c6c00c1b7c0a643f815717/biochemie}, description = {cGMP binding domain D mediates a unique activation mechanism in Plasmodium falciparum PKG - ACS Infectious Diseases (ACS Publications)}, doi = {10.1021/acsinfecdis.7b00222}, interhash = {03981d146b2301ab41d5a9f4d1e585fd}, intrahash = {cd98559a53c6c00c1b7c0a643f815717}, journal = {ACS Infect. Dis.}, keywords = {herberg myown}, number = 3, pages = {415-423}, timestamp = {2018-05-24T15:37:58.000+0200}, title = {cGMP binding domain D mediates a unique activation mechanism in Plasmodium falciparum PKG }, url = {http://pubs.acs.org/doi/10.1021/acsinfecdis.7b00222}, volume = 4, year = 2018 }