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1pxt

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{{STRUCTURE_1pxt| PDB=1pxt | SCENE= }}
{{STRUCTURE_1pxt| PDB=1pxt | SCENE= }}
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'''THE 2.8 ANGSTROMS STRUCTURE OF PEROXISOMAL 3-KETOACYL-COA THIOLASE OF SACCHAROMYCES CEREVISIAE: A FIVE LAYERED A-B-A-B-A STRUCTURE, CONSTRUCTED FROM TWO CORE DOMAINS OF IDENTICAL TOPOLOGY'''
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===THE 2.8 ANGSTROMS STRUCTURE OF PEROXISOMAL 3-KETOACYL-COA THIOLASE OF SACCHAROMYCES CEREVISIAE: A FIVE LAYERED A-B-A-B-A STRUCTURE, CONSTRUCTED FROM TWO CORE DOMAINS OF IDENTICAL TOPOLOGY===
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==Overview==
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BACKGROUND: The peroxisomal enzyme 3-ketoacyl-coenzyme A thiolase of the yeast Saccharomyces cerevisiae is a homodimer with 417 residues per subunit. It is synthesized in the cytosol and subsequently imported into the peroxisome where it catalyzes the last step of the beta-oxidation pathway. We have determined the structure of this thiolase in order to study the reaction mechanism, quaternary associations and intracellular targeting of thiolases generally, and to understand the structural basis of genetic disorders associated with human thiolases. RESULTS: Here we report the crystal structure of unliganded yeast thiolase refined at 2.8 A resolution. The enzyme comprises three domains; two compact core domains having the same fold and a loop domain. Each of the two core domains is folded into a mixed five-stranded beta-sheet covered on each side by helices and the two are assembled into a five-layered alpha beta alpha beta alpha structure. The central layer is formed by two helices, which point with their amino termini towards the active site. The loop domain, which is to some extent stabilized by interactions with the other subunit, runs over the surface of the two core domains, encircling the active site of its own subunit. CONCLUSIONS: The crystal structure of thiolase shows that the active site is a shallow pocket, shaped by highly conserved residues. Two conserved cysteines and a histidine at the floor of this pocket probably play key roles in the reaction mechanism. The two active sites are on the same face of the dimer, far from the amino and carboxyl termini of both subunits and the disordered amino-terminal import signal sequence.
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(as it appears on PubMed at http://www.pubmed.gov), where 7812714 is the PubMed ID number.
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{{ABSTRACT_PUBMED_7812714}}
==About this Structure==
==About this Structure==
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[[Category: Wierenga, R K.]]
[[Category: Wierenga, R K.]]
[[Category: Thiolase]]
[[Category: Thiolase]]
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Revision as of 12:44, 29 July 2008

Image:1pxt.png

Template:STRUCTURE 1pxt

THE 2.8 ANGSTROMS STRUCTURE OF PEROXISOMAL 3-KETOACYL-COA THIOLASE OF SACCHAROMYCES CEREVISIAE: A FIVE LAYERED A-B-A-B-A STRUCTURE, CONSTRUCTED FROM TWO CORE DOMAINS OF IDENTICAL TOPOLOGY

Template:ABSTRACT PUBMED 7812714

About this Structure

1PXT is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.

Reference

The 2.8 A crystal structure of peroxisomal 3-ketoacyl-CoA thiolase of Saccharomyces cerevisiae: a five-layered alpha beta alpha beta alpha structure constructed from two core domains of identical topology., Mathieu M, Zeelen JP, Pauptit RA, Erdmann R, Kunau WH, Wierenga RK, Structure. 1994 Sep 15;2(9):797-808. PMID:7812714

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