View source for 8ka1


==Crystal structure of Vibrio vulnificus RID-dependent transforming NADase domain (RDTND)/calmodulin-binding domain of Rho inactivation domain (RID-CBD) complexed with Ca2+-free calmodulin==
<StructureSection load='8ka1' size='340' side='right'caption='[[8ka1]], [[Resolution|resolution]] 2.82&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8ka1]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Vibrio_vulnificus Vibrio vulnificus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8KA1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8KA1 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.82&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=8ka1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ka1 OCA], [https://pdbe.org/8ka1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ka1 RCSB], [https://www.ebi.ac.uk/pdbsum/8ka1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ka1 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MARTX_VIBVL MARTX_VIBVL] Precursor of a multifunctional toxin that causes destruction of the actin cytoskeleton by covalent cross-linking of actin and inactivation of Rho GTPases when translocated into the host cytoplasm. Upon translocation into the host cell, undergoes autoprocessing in cis mediated by the peptidase C80 domain (also named CPD domain): the protease activity is activated upon binding inositol hexakisphosphate (InsP6) present at the host cell membrane and delivers the Cysteine protease domain-containing toxin F3 chain to the host cytosol. The Cysteine protease domain-containing toxin F3 chain will then further cleave and release effector toxin chains that cause disassembly of the actin cytoskeleton and enhance V.vulnificus colonization of the small intestine, possibly by facilitating evasion of phagocytic cells.[UniProtKB:Q9KS12]  Following autocatalytic cleavage in cis, this chain mediates processing in trans to release other individual toxin chains to the host cytosol. Released effector toxin chains cause disassembly of the actin cytoskeleton and enhance V.vulnificus colonization of the small intestine, possibly by facilitating evasion of phagocytic cells.[UniProtKB:Q9KS12]  Actin-directed toxin that catalyzes the covalent cross-linking of host cytoplasmic monomeric actin. Mediates the cross-link between 'Lys-50' of one monomer and 'Glu-270' of another actin monomer, resulting in formation of highly toxic actin oligomers that cause cell rounding. The toxin can be highly efficient at very low concentrations by acting on formin homology family proteins: toxic actin oligomers bind with high affinity to formins and adversely affect both nucleation and elongation abilities of formins, causing their potent inhibition in both profilin-dependent and independent manners. Acts as an acid--amino-acid ligase that transfers the gamma-phosphoryl group of ATP to the 'Glu-270' actin residue, resulting in the formation of an activated acyl phosphate intermediate. This intermediate is further hydrolyzed and the energy of hydrolysis is utilized for the formation of the amide bond between actin subunits.[UniProtKB:Q9KS12]  N-epsilon-fatty acyltransferase that mediates lysine-palmitoylation of host Rho GTPase proteins, with a strong preference for host Rac1. After delivery to the host cytosol, localizes to the host cell membrane where it palmitoylates host Rho GTPase proteins, resulting in loss of all active GTP-bound Rho and subsequent actin depolymerization. Prenylation of host Rac1 at the C-terminus is required for lysine-palmitoylation.[UniProtKB:Q9KS12]  Indirectly activates the small GTPase CDC42.[UniProtKB:Q9KS12]
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Vibrio vulnificus]]
[[Category: Choi S]]
[[Category: Hwang J]]
[[Category: Kim MH]]
[[Category: Lee Y]]