View source for 5nxi


==Carbonic Anhydrase II Inhibitor RA2==
<StructureSection load='5nxi' size='340' side='right'caption='[[5nxi]], [[Resolution|resolution]] 1.16&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5nxi]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NXI OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5NXI 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]] 1.16&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=9DE:4-[(4-bromophenyl)sulfonylamino]benzenesulfonamide'>9DE</scene>, <scene name='pdbligand=CIT:CITRIC+ACID'>CIT</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=5nxi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nxi OCA], [https://pdbe.org/5nxi PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5nxi RCSB], [https://www.ebi.ac.uk/pdbsum/5nxi PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5nxi ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/CAH2_HUMAN CAH2_HUMAN] Defects in CA2 are the cause of osteopetrosis autosomal recessive type 3 (OPTB3) [MIM:[https://omim.org/entry/259730 259730]; also known as osteopetrosis with renal tubular acidosis, carbonic anhydrase II deficiency syndrome, Guibaud-Vainsel syndrome or marble brain disease. Osteopetrosis is a rare genetic disease characterized by abnormally dense bone, due to defective resorption of immature bone. The disorder occurs in two forms: a severe autosomal recessive form occurring in utero, infancy, or childhood, and a benign autosomal dominant form occurring in adolescence or adulthood. Autosomal recessive osteopetrosis is usually associated with normal or elevated amount of non-functional osteoclasts. OPTB3 is associated with renal tubular acidosis, cerebral calcification (marble brain disease) and in some cases with mental retardation.<ref>PMID:1928091</ref> <ref>PMID:1542674</ref> <ref>PMID:8834238</ref> <ref>PMID:9143915</ref> <ref>PMID:15300855</ref> 
== Function ==
[https://www.uniprot.org/uniprot/CAH2_HUMAN CAH2_HUMAN] Essential for bone resorption and osteoclast differentiation (By similarity). Reversible hydration of carbon dioxide. Can hydrate cyanamide to urea. Involved in the regulation of fluid secretion into the anterior chamber of the eye.<ref>PMID:10550681</ref> <ref>PMID:11831900</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Accurate prediction of protein-ligand binding affinities is essential for hit-to-lead optimization and virtual screening. The reliability of scoring functions can be improved by implementing of quantum effects. Here, we demonstrate the ranking power of the semiempirical quantum mechanics (SQM)/implicit solvent (COSMO) scoring function using a challenging set of 10 inhibitors binding to carbonic anhydrase II via Zn2+ in the active site. This new dataset consists of the high-resolution (1.1 - 1.4 A) crystal structures and experimentally determined Ki values. It allowed us to evaluate the common approximations, such as representing the solvent implicitly or using a single target conformation combined with a set of ligand docking poses. The SQM/COSMO attained good correlation of R2 0.56 - 0.77 with the experimental inhibitory activities, benefiting from the careful handling of both noncovalent interactions (e.g. charge transfer) and solvation. This proof-of-concept study of SQM/COSMO ranking for metalloprotein-ligand systems demonstrates its potential for hit-to-lead applications.

Ranking Power of the SQM/COSMO Scoring Function on Carbonic Anhydrase II-Inhibitor Complexes.,Pecina A, Brynda J, Vrzal L, Gnanasekaran R, Horejsi M, Eyrilmez S, Rezac J, Lepsik M, Rezacova P, Hobza P, Majer P, Veverka V, Fanfrlik J Chemphyschem. 2018 Jan 8. doi: 10.1002/cphc.201701104. PMID:29316128<ref>PMID:29316128</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5nxi" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carbonic anhydrase 3D structures|Carbonic anhydrase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Brynda J]]
[[Category: Fanfrlik J]]
[[Category: Horejsi M]]
[[Category: Rezacova P]]