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1m7s

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{{STRUCTURE_1m7s| PDB=1m7s | SCENE= }}
{{STRUCTURE_1m7s| PDB=1m7s | SCENE= }}
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'''Crystal Structure Analysis of Catalase CatF of Pseudomonas syringae'''
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===Crystal Structure Analysis of Catalase CatF of Pseudomonas syringae===
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==Overview==
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Catalase CatF of Pseudomonas syringae has been identified phylogenetically as a clade 1 catalase, closely related to plant catalases, a group from which no structure has been determined. The structure of CatF has been refined at 1.8 A resolution by using X-ray synchrotron data collected from a crystal flash-cooled with liquid nitrogen. The crystallographic agreement factors R and R(free) are, respectively, 18.3% and 24.0%. The asymmetric unit of the crystal contains a whole molecule that shows accurate 222-point group symmetry. The crystallized enzyme is a homotetramer of subunits with 484 residues, some 26 residues shorter than predicted from the DNA sequence. Mass spectrometry analysis confirmed the absence of 26 N-terminal residues, possibly removed by a periplasmic transport system. The core structure of the CatF subunit was closely related to seven other catalases with root-mean-square deviations (RMSDs) of 368 core Calpha atoms of 0.99-1.30 A. The heme component of CatF is heme b in the same orientation that is found in Escherichia coli hydroperoxidase II, an orientation that is flipped 180 degrees with respect the orientation of the heme in bovine liver catalase. NADPH is not found in the structure of CatF because key residues required for nucleotide binding are missing; 2129 water molecules were refined into the model. Water occupancy in the main or perpendicular channel of CatF varied among the four subunits from two to five in the region between the heme and the conserved Asp150. A comparison of the water occupancy in this region with the same region in other catalases reveals significant differences among the catalases.
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(as it appears on PubMed at http://www.pubmed.gov), where 12557185 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12557185}}
==About this Structure==
==About this Structure==
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[[Category: Alpha helical domain]]
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Revision as of 20:24, 2 July 2008

Image:1m7s.png

Template:STRUCTURE 1m7s

Crystal Structure Analysis of Catalase CatF of Pseudomonas syringae

Template:ABSTRACT PUBMED 12557185

About this Structure

1M7S is a Single protein structure of sequence from Pseudomonas syringae. Full crystallographic information is available from OCA.

Reference

Structure of the Clade 1 catalase, CatF of Pseudomonas syringae, at 1.8 A resolution., Carpena X, Soriano M, Klotz MG, Duckworth HW, Donald LJ, Melik-Adamyan W, Fita I, Loewen PC, Proteins. 2003 Feb 15;50(3):423-36. PMID:12557185

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