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2g50

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[[Image:2g50.gif|left|200px]]
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{{STRUCTURE_2g50| PDB=2g50 | SCENE= }}
{{STRUCTURE_2g50| PDB=2g50 | SCENE= }}
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'''The location of the allosteric amino acid binding site of muscle pyruvate kinase.'''
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===The location of the allosteric amino acid binding site of muscle pyruvate kinase.===
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==Overview==
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The isoform of pyruvate kinase from brain and muscle of mammals (M(1)-PYK) is allosterically inhibited by phenylalanine. Initial observations in this model allosteric system indicate that Ala binds competitively with Phe, but elicits a minimal allosteric response. Thus, the allosteric ligand of this system must have requirements for eliciting an allosteric response in addition to the requirements for binding. Phe analogues have been used to dissect what chemical properties of Phe are responsible for eliciting the allosteric response. We first demonstrate that the l-2-aminopropanaldehyde substructure of the amino acid ligand is primarily responsible for binding to M(1)-PYK. Since the allosteric response to Ala is minimal and linear addition of methyl groups beyond the beta-carbon increase the magnitude of the allosteric response, we conclude that moieties beyond the beta-carbon are primarily responsible for allostery. Instead of an all-or-none mechanism of allostery, these findings support the idea that the bulk of the hydrophobic side chain, but not the aromatic nature, is the primary determinant of the magnitude of the observed allosteric inhibition. The use of these results to direct structural studies has resulted in a 1.65 A structure of M(1)-PYK with Ala bound. The coordination of Ala in the allosteric amino acid binding site confirms the binding role of the l-2-aminopropanaldehyde substructure of the ligand. Collectively, this study confirms that a ligand can have chemical regions specific for eliciting the allosteric signal in addition to the chemical regions necessary for binding.
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(as it appears on PubMed at http://www.pubmed.gov), where 16634623 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16634623}}
==About this Structure==
==About this Structure==
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[[Category: Phosphoryl transfer]]
[[Category: Phosphoryl transfer]]
[[Category: Pyruvate kinase]]
[[Category: Pyruvate kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:41:47 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 14:20:07 2008''

Revision as of 11:20, 28 July 2008

Image:2g50.png

Template:STRUCTURE 2g50

The location of the allosteric amino acid binding site of muscle pyruvate kinase.

Template:ABSTRACT PUBMED 16634623

About this Structure

2G50 is a Single protein structure of sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA.

Reference

Differentiating a ligand's chemical requirements for allosteric interactions from those for protein binding. Phenylalanine inhibition of pyruvate kinase., Williams R, Holyoak T, McDonald G, Gui C, Fenton AW, Biochemistry. 2006 May 2;45(17):5421-9. PMID:16634623

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