2ax2
From Proteopedia
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| , resolution 1.50Å | |||||||
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| Ligands: | |||||||
| Gene: | CA2 (Homo sapiens) | ||||||
| Activity: | Carbonate dehydratase, with EC number 4.2.1.1 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Production and X-ray crystallographic analysis of fully deuterated human carbonic anhydrase II
Contents |
Overview
Human carbonic anhydrase II (HCA II) is a zinc metalloenzyme that catalyzes the reversible hydration and dehydration of carbon dioxide and bicarbonate, respectively. The rate-limiting step in catalysis is the intramolecular transfer of a proton between the zinc-bound solvent (H2O/OH-) and the proton-shuttling residue His64. This distance (approximately 7.5 A) is spanned by a well defined active-site solvent network stabilized by amino-acid side chains (Tyr7, Asn62, Asn67, Thr199 and Thr200). Despite the availability of high-resolution (approximately 1.0 A) X-ray crystal structures of HCA II, there is currently no definitive information available on the positions and orientations of the H atoms of the solvent network or active-site amino acids and their ionization states. In preparation for neutron diffraction studies to elucidate this hydrogen-bonding network, perdeuterated HCA II has been expressed, purified, crystallized and its X-ray structure determined to 1.5 A resolution. The refined structure is highly isomorphous with hydrogenated HCA II, especially with regard to the active-site architecture and solvent network. This work demonstrates the suitability of these crystals for neutron macromolecular crystallography.
Disease
Known disease associated with this structure: Osteopetrosis, autosomal recessive 3, with renal tubular acidosis OMIM:[611492]
About this Structure
2AX2 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Production and X-ray crystallographic analysis of fully deuterated human carbonic anhydrase II., Budayova-Spano M, Fisher SZ, Dauvergne MT, Agbandje-McKenna M, Silverman DN, Myles DA, McKenna R, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2006 Jan 1;62(Pt 1):6-9., Epub 2005 Dec 16. PMID:16511248
Page seeded by OCA on Mon Mar 31 01:58:26 2008
