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5jod

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== Publication Abstract from PubMed ==
== Publication Abstract from PubMed ==
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Proplasmepsin II is the zymogen of plasmepsin II, an aspartic proteinase used by Plasmodiumfalciparum to digest hemoglobin during the blood stage of malaria. A large shift between the N-domain and the central and C-domains of proplasmepsin II opens the active site cleft, preventing the formation of a functional aspartic proteinase active site. This mode of inhibition of catalytic activity has not been observed in any other aspartic proteinase zymogen. Instead of occluding a pre-formed active site, as in the gastric aspartic proteinase zymogens, the prosegment of proplasmepsin II interacts extensively with the C-domain and serves as a 'harness' to keep the domains apart. Disruption of key salt bridges at low pH may be important in activation.
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Plasmepsin IV from Plasmodium falciparum (PM IV) is a promising target for the development of novel antimalarial drugs. Here, the crystal structure of the truncated zymogen of PM IV (pPM IV), consisting of the mature enzyme plus a prosegment of 47 residues, has been determined at 1.5 A resolution. pPM IV presents the fold previously described for studied proplasmepsins, displaying closer similarities to proplasmepin IV from P. vivax (pPvPM) than to the other two proplasmepsins from P. falciparum. The study and comparison of the pPM IV structure with the proplasmepsin structures described previously provide information about the similarities and differences in the inactivation-activation mechanisms among the plasmepsin zymogens.
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Crystal structure of the novel aspartic proteinase zymogen proplasmepsin II from plasmodium falciparum.,Bernstein NK, Cherney MM, Loetscher H, Ridley RG, James MN Nat Struct Biol. 1999 Jan;6(1):32-7. PMID:9886289<ref>PMID:9886289</ref>
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Crystal structure of Plasmodium falciparum proplasmepsin IV: the plasticity of proplasmepsins.,Recacha R, Jaudzems K, Akopjana I, Jirgensons A, Tars K Acta Crystallogr F Struct Biol Commun. 2016 Sep;72(Pt 9):659-66. doi:, 10.1107/S2053230X16011663. Epub 2016 Aug 9. PMID:27599854<ref>PMID:27599854</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

Revision as of 08:58, 3 October 2016

Structure of proplasmepsin IV from Plasmodium falciparum

5jod, resolution 1.53Å

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