1qhw

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spinqualitylabelsall models PDB ID 1qhw Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image
, resolution 2.2Å
Ligands:	, and
Gene:	ACP5 (Rattus norvegicus)
Activity:	Acid phosphatase, with EC number 3.1.3.2
Coordinates:	save as pdb, mmCIF, xml

PURPLE ACID PHOSPHATASE FROM RAT BONE

Overview

The crystal structure of purple acid phosphatase from rat bone has been determined by molecular replacement and the structure has been refined to 2.2 A resolution to an R -factor of 21.3 % (R -free 26.5 %). The core of the enzyme consists of two seven-stranded mixed beta-sheets, with each sheet flanked by solvent-exposed alpha-helices on one side. The two sheets pack towards each other forming a beta-sandwich. The di-iron center, located at the bottom of the active-site pocket at one edge of the beta-sandwich, contains a mu-hydroxo or mu-oxo bridge and both metal ions are observed in an almost perfect octahedral coordination geometry. The electron density map indicates that a mu-(hydr)oxo bridge is found in the metal center and that at least one solvent molecule is located in the first coordination sphere of one of the metal ions. The crystallographic study of rat purple acid phosphatase reveals that the mammalian enzymes are very similar in overall structure to the plant enzymes in spite of only 18 % overall sequence identity. In particular, coordination and geometry of the iron cluster is preserved in both enzymes and comparison of the active-sites suggests a common mechanism for the mammalian and plant enzymes. However, significant differences are found in the architecture of the substrate binding pocket.

About this Structure

1QHW is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Three-dimensional structure of a mammalian purple acid phosphatase at 2.2 A resolution with a mu-(hydr)oxo bridged di-iron center., Lindqvist Y, Johansson E, Kaija H, Vihko P, Schneider G, J Mol Biol. 1999 Aug 6;291(1):135-47. PMID:10438611

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