1kfl: Difference between revisions

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[[Image:1kfl.jpg|left|200px]]
{{Seed}}
[[Image:1kfl.png|left|200px]]


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{{STRUCTURE_1kfl|  PDB=1kfl  |  SCENE=  }}  
{{STRUCTURE_1kfl|  PDB=1kfl  |  SCENE=  }}  


'''Crystal structure of phenylalanine-regulated 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHP synthase) from E.coli complexed with Mn2+, PEP, and Phe'''
===Crystal structure of phenylalanine-regulated 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHP synthase) from E.coli complexed with Mn2+, PEP, and Phe===




==Overview==
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3-Deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHPS), the first enzyme of the aromatic biosynthetic pathway in microorganisms and plants, catalyzes the aldol-like condensation of phosphoenolpyruvate and D-erythrose-4-phosphate with the formation of 3-deoxy-D-arabino-heptulosonate-7-phosphate. In Escherichia coli, there are three isoforms of DAHPS, each specifically feedback-regulated by one of the three aromatic amino acid end products. The crystal structure of the phenylalanine-regulated DAHPS from E.coli in complex with its inhibitor, L-phenylalanine, phosphoenolpyruvate, and metal cofactor, Mn(2+), has been determined to 2.8A resolution. Phe binds in a cavity formed by residues of two adjacent subunits and is located about 20A from the closest active site. A model for the mechanism of allosteric inhibition has been derived from conformational differences between the Phe-bound and previously determined Phe-free structures. Two interrelated paths of conformational changes transmit the inhibitory signal from the Phe-binding site to the active site of DAHPS. The first path involves transmission within a single subunit due to the movement of adjacent segments of the protein. The second involves alterations in the contacts between subunits. The combination of these two paths changes the conformation of one of the active site loops significantly and shifts the other slightly. This alters the interaction of DAHPS with both of its substrates. Upon binding of Phe, the enzyme loses the ability to bind D-erythrose-4-phosphate and binds phosphoenolpyruvate in a flipped orientation.
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{{ABSTRACT_PUBMED_12126632}}


==About this Structure==
==About this Structure==
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[[Category: Beta/alpha barrel]]
[[Category: Beta/alpha barrel]]
[[Category: Feedback regulation]]
[[Category: Feedback regulation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 10:16:13 2008''

Revision as of 07:16, 2 July 2008

File:1kfl.png

Template:STRUCTURE 1kfl

Crystal structure of phenylalanine-regulated 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase (DAHP synthase) from E.coli complexed with Mn2+, PEP, and Phe

Template:ABSTRACT PUBMED 12126632

About this Structure

1KFL is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Allosteric inhibition of 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase alters the coordination of both substrates., Shumilin IA, Zhao C, Bauerle R, Kretsinger RH, J Mol Biol. 2002 Jul 26;320(5):1147-56. PMID:12126632

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