1thj: Difference between revisions

A carbonic anhydrase from the thermophilic archaeon Methanosarcina, thermophila that exhibits no significant sequence similarity to known, carbonic anhydrases has recently been characterized. Here we present the, structure of this enzyme, which adopts a left-handed parallel beta-helix, fold. This fold is of particular interest since it contains only, left-handed crossover connections between the parallel beta-strands, which, so far have been observed very infrequently. The active form of the enzyme, is a trimer with three zinc-containing active sites, each located at the, interface between two monomers. While the arrangement of active site, groups differs between this enzyme and the carbonic anhydrases from higher, vertebrates, there are structural similarities in the zinc coordination, environment, suggestive of convergent evolution dictated by the chemical, requirements for catalysis of the same reaction. Based on sequence, similarities, the structure of this enzyme is the prototype of a new class, of carbonic anhydrases with representatives in all three phylogenetic, domains of life.

1THJ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Methanosarcina_thermophila Methanosarcina thermophila] with ZN as [http://en.wikipedia.org/wiki/ligand ligand]. The following page contains interesting information on the relation of 1THJ with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb49_1.html Carbonic Anhydrase]]. Active as [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] Structure known Active Sites: 1, 2 and 3. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1THJ OCA].  

''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov  5 12:59:57 2007''