View source for 2nxt

{{STRUCTURE_2nxt|  PDB=2nxt  |  SCENE=  }} 
===Structural and kinetic effects of hydrophobic mutations in the active site of human carbonic anhydrase II===
{{ABSTRACT_PUBMED_17330962}}

==Disease==
[[http://www.uniprot.org/uniprot/CAH2_HUMAN CAH2_HUMAN]] Defects in CA2 are the cause of osteopetrosis autosomal recessive type 3 (OPTB3) [MIM:[http://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==
[[http://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> 

==About this Structure==
[[2nxt]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NXT OCA]. 

==See Also==
*[[Carbonic anhydrase|Carbonic anhydrase]]

==Reference==
<ref group="xtra">PMID:017330962</ref><references group="xtra"/><references/>
[[Category: Carbonate dehydratase]]
[[Category: Homo sapiens]]
[[Category: Fisher, S Z.]]
[[Category: McKenna, R.]]
[[Category: Carbonic anhydrase]]
[[Category: Histidine 64]]
[[Category: Lyase]]
[[Category: Proton transfer]]