5jn8

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Revision as of 17:59, 15 November 2017

Crystal Structure for the complex of human carbonic anhydrase IV and acetazolamide

Structural highlights

5jn8 is a 4 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , , ,
Related:	5jn9, 5jna, 5jnc, 5jnd
Gene:	CA4 (HUMAN)
Activity:	Carbonate dehydratase, with EC number 4.2.1.1
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[CAH4_HUMAN] Defects in CA4 are the cause of retinitis pigmentosa type 17 (RP17) [MIM:600852]. RP leads to degeneration of retinal photoreceptor cells. Patients typically have night vision blindness and loss of midperipheral visual field. As their condition progresses, they lose their far peripheral visual field and eventually central vision as well. RP17 inheritance is autosomal dominant. Note=Defective acid overload removal from retina and retinal epithelium, due to mutant CA4, is responsible for photoreceptor degeneration, indicating that impaired pH homeostasis is the most likely cause underlying the RP17 phenotype.^[1]

Function

[CAH4_HUMAN] Reversible hydration of carbon dioxide. May stimulate the sodium/bicarbonate transporter activity of SLC4A4 that acts in pH homeostasis. It is essential for acid overload removal from the retina and retina epithelium, and acid release in the choriocapillaris in the choroid.^[2]

Publication Abstract from PubMed

It has recently been demonstrated that the C-terminal deletion mutant of recombinant human carbonic anhydrase IV (G267X CA IV) converts the normally glycosylphosphatidylinositol-anchored enzyme into a soluble secretory form which has the same catalytic properties as the membrane-associated enzyme purified from human tissues. We have determined the three-dimensional structure of the secretory form of human CA IV by x-ray crystallographic methods to a resolution of 2.8 A. Although the zinc binding site and the hydrophobic substrate binding pocket of CA IV are generally similar to those of other mammalian isozymes, unique structural differences are found elsewhere in the active site. Two disufide linkages, Cys-6-Cys-11G and Cys-23-Cys-203, stabilize the conformation of the N-terminal domain. The latter disulfide additionally stabilizes an active site loop containing a cis-peptide linkage between Pro-201 and Thr-202 (this loop contains catalytic residue Thr-199). On the opposite side of the active site, the Val-131-Asp-136 segment adopts an extended loop conformation instead of an alpha-helix conformation as found in other isozymes. Finally, the C terminus is surrounded by a substantial electropositive surface potential, which is likely to stabilize the interaction of CA IV with the negatively charged phospholipid headgroups of the membrane. These structural features are unique to CA IV and provide a framework for the design of sulfonamide inhibitors selective for this particular isozyme.

Crystal structure of the secretory form of membrane-associated human carbonic anhydrase IV at 2.8-A resolution.,Stams T, Nair SK, Okuyama T, Waheed A, Sly WS, Christianson DW Proc Natl Acad Sci U S A. 1996 Nov 26;93(24):13589-94. PMID:8942978^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Yang Z, Alvarez BV, Chakarova C, Jiang L, Karan G, Frederick JM, Zhao Y, Sauve Y, Li X, Zrenner E, Wissinger B, Hollander AI, Katz B, Baehr W, Cremers FP, Casey JR, Bhattacharya SS, Zhang K. Mutant carbonic anhydrase 4 impairs pH regulation and causes retinal photoreceptor degeneration. Hum Mol Genet. 2005 Jan 15;14(2):255-65. Epub 2004 Nov 24. PMID:15563508 doi:ddi023
↑ Yang Z, Alvarez BV, Chakarova C, Jiang L, Karan G, Frederick JM, Zhao Y, Sauve Y, Li X, Zrenner E, Wissinger B, Hollander AI, Katz B, Baehr W, Cremers FP, Casey JR, Bhattacharya SS, Zhang K. Mutant carbonic anhydrase 4 impairs pH regulation and causes retinal photoreceptor degeneration. Hum Mol Genet. 2005 Jan 15;14(2):255-65. Epub 2004 Nov 24. PMID:15563508 doi:ddi023
↑ Stams T, Nair SK, Okuyama T, Waheed A, Sly WS, Christianson DW. Crystal structure of the secretory form of membrane-associated human carbonic anhydrase IV at 2.8-A resolution. Proc Natl Acad Sci U S A. 1996 Nov 26;93(24):13589-94. PMID:8942978

1 Structural highlights
2 Disease
3 Function
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/5jn8"

@@ Line 3: / Line 3: @@
 <StructureSection load='5jn8' size='340' side='right' caption='[[5jn8]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[5jn8]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5JN8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5JN8 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[5jn8]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5JN8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5JN8 FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=AZM:5-ACETAMIDO-1,3,4-THIADIAZOLE-2-SULFONAMIDE'>AZM</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5jn9|5jn9]], [[5jna|5jna]], [[5jnc|5jnc]], [[5jnd|5jnd]]</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CA4 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carbonate_dehydratase Carbonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.1 4.2.1.1] </span></td></tr>
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5jn8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5jn8 OCA], [http://pdbe.org/5jn8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5jn8 RCSB], [http://www.ebi.ac.uk/pdbsum/5jn8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5jn8 ProSAT]</span></td></tr>
@@ Line 27: / Line 28: @@
 </StructureSection>
 [[Category: Carbonate dehydratase]]
+[[Category: Human]]
 [[Category: Cera, E Di]]
 [[Category: Chen, Z]]

5jn8

From Proteopedia

Revision as of 17:59, 15 November 2017

Crystal Structure for the complex of human carbonic anhydrase IV and acetazolamide

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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