1doi

From Proteopedia

Revision as of 10:33, 8 November 2007

2FE-2S FERREDOXIN FROM HALOARCULA MARISMORTUI

Overview

Haloarcula marismortui is an archaebacterium that flourishes in the, world's saltiest body of water, the Dead Sea. The cytosol of this organism, is a supersaturated salt solution in which proteins are soluble and, active. The crystal structure of a 2Fe-2S ferredoxin from H. marismortui, determined at 1.9 A is similar to those of plant-type 2Fe-2S ferredoxins, of known structure, with two important distinctions. The entire surface of, the protein is coated with acidic residues except for the vicinity of the, iron-sulphur cluster, and there is an insertion of two amphipathic helices, near the N-terminus. These form a separate hyperacidic domain whose, postulated function to provide extra surface carboxylates for solvation., These data and the fact that bound surface water molecules have on the, average 40% more hydrogen bonds than in a typical non-halophilic protein, crystal structure support the notion that haloadaptation involves better, water binding capacity.

About this Structure

1DOI is a Single protein structure of sequence from Haloarcula marismortui with K and FES as ligands. Structure known Active Site: 22. Full crystallographic information is available from OCA.

Reference

Insights into protein adaptation to a saturated salt environment from the crystal structure of a halophilic 2Fe-2S ferredoxin., Frolow F, Harel M, Sussman JL, Mevarech M, Shoham M, Nat Struct Biol. 1996 May;3(5):452-8. PMID:8612076

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