4off

Structural highlights

Function

KGP_PLAF7 Serine/threonine protein kinase which acts as a downstream effector of the second messenger cGMP (PubMed:12068803, PubMed:12817987, PubMed:26149123). Controls the release of Ca(2+) from intracellular stores by regulating phosphoinositide biosynthesis (PubMed:24594931). Ca(2+) signals are essential for merozoite and sporozoite invasion and egress from host hepatocytes and erythrocytes, and, in the mosquito vector, for gametocyte activation, and ookinete and sporozoite motility (PubMed:24594931). During the host liver stage, regulates the initial invasion of host hepatocytes by sporozoites by regulating sporozoite motility and microneme exocytosis (By similarity). Following parasite development in the hepatocytes, required for the release of merosomes, a vesicle containing the mature merozoites (By similarity). During the asexual blood stage, required for the progression from schizont to the ring stage following merozoite invasion of host erythrocytes and for merozoite egress (PubMed:19915077, PubMed:26149123, PubMed:25646845). Regulates merozoite egress by promoting the release of exonemes and micronemes which contain proteins essential for egress (PubMed:23675297). Phosphorylates CDPK1 predominantly at the late schizont stage; phosphorylation at 'Ser-64' regulates CDPK1 protein-protein interaction and phosphorylation at 'Thr-231' may regulate CDPK1 kinase activity (PubMed:26149123). Phosphorylates MyoA at 'Ser-19' (PubMed:26149123). In the mosquito vector, required for the initiation of gametogenesis induced by xanthurenic acid, specifically the gametocyte differentiation from the crescent-shaped form to the spherical form (PubMed:18532880). Required for the gliding motility of ookinetes to reach and penetrate the midgut epithelium by promoting Ca(2+)-mediated activation of CDPK1 and CDPK4 (By similarity). Also required for microneme secretion in ookinete by promoting Ca(2+)-mediated activation of CDPK3 (By similarity).[UniProtKB:A0A509AKL0]^{[1] [2] [3] [4] [5] [6] [7] [8]}

References

1. ↑ Deng W, Baker DA. A novel cyclic GMP-dependent protein kinase is expressed in the ring stage of the Plasmodium falciparum life cycle. Mol Microbiol. 2002 Jun;44(5):1141-51. doi: 10.1046/j.1365-2958.2002.02948.x. PMID:12068803 doi:http://dx.doi.org/10.1046/j.1365-2958.2002.02948.x
2. ↑ Deng W, Parbhu-Patel A, Meyer DJ, Baker DA. The role of two novel regulatory sites in the activation of the cGMP-dependent protein kinase from Plasmodium falciparum. Biochem J. 2003 Sep 1;374(Pt 2):559-65. doi: 10.1042/BJ20030474. PMID:12817987 doi:http://dx.doi.org/10.1042/BJ20030474
3. ↑ McRobert L, Taylor CJ, Deng W, Fivelman QL, Cummings RM, Polley SD, Billker O, Baker DA. Gametogenesis in malaria parasites is mediated by the cGMP-dependent protein kinase. PLoS Biol. 2008 Jun 3;6(6):e139. doi: 10.1371/journal.pbio.0060139. PMID:18532880 doi:http://dx.doi.org/10.1371/journal.pbio.0060139
4. ↑ Taylor HM, McRobert L, Grainger M, Sicard A, Dluzewski AR, Hopp CS, Holder AA, Baker DA. The malaria parasite cyclic GMP-dependent protein kinase plays a central role in blood-stage schizogony. Eukaryot Cell. 2010 Jan;9(1):37-45. doi: 10.1128/EC.00186-09. Epub 2009 Nov 13. PMID:19915077 doi:http://dx.doi.org/10.1128/EC.00186-09
5. ↑ Collins CR, Hackett F, Strath M, Penzo M, Withers-Martinez C, Baker DA, Blackman MJ. Malaria parasite cGMP-dependent protein kinase regulates blood stage merozoite secretory organelle discharge and egress. PLoS Pathog. 2013 May;9(5):e1003344. doi: 10.1371/journal.ppat.1003344. Epub 2013, May 9. PMID:23675297 doi:http://dx.doi.org/10.1371/journal.ppat.1003344
6. ↑ Brochet M, Collins MO, Smith TK, Thompson E, Sebastian S, Volkmann K, Schwach F, Chappell L, Gomes AR, Berriman M, Rayner JC, Baker DA, Choudhary J, Billker O. Phosphoinositide metabolism links cGMP-dependent protein kinase G to essential Ca(2)(+) signals at key decision points in the life cycle of malaria parasites. PLoS Biol. 2014 Mar 4;12(3):e1001806. doi: 10.1371/journal.pbio.1001806., eCollection 2014 Mar. PMID:24594931 doi:http://dx.doi.org/10.1371/journal.pbio.1001806
7. ↑ Kim JJ, Flueck C, Franz E, Sanabria-Figueroa E, Thompson E, Lorenz R, Bertinetti D, Baker DA, Herberg FW, Kim C. Crystal Structures of the Carboxyl cGMP Binding Domain of the Plasmodium falciparum cGMP-dependent Protein Kinase Reveal a Novel Capping Triad Crucial for Merozoite Egress. PLoS Pathog. 2015 Feb 3;11(2):e1004639. doi: 10.1371/journal.ppat.1004639., eCollection 2015 Feb. PMID:25646845 doi:http://dx.doi.org/10.1371/journal.ppat.1004639
8. ↑ Alam MM, Solyakov L, Bottrill AR, Flueck C, Siddiqui FA, Singh S, Mistry S, Viskaduraki M, Lee K, Hopp CS, Chitnis CE, Doerig C, Moon RW, Green JL, Holder AA, Baker DA, Tobin AB. Phosphoproteomics reveals malaria parasite Protein Kinase G as a signalling hub regulating egress and invasion. Nat Commun. 2015 Jul 7;6:7285. doi: 10.1038/ncomms8285. PMID:26149123 doi:http://dx.doi.org/10.1038/ncomms8285