2f3g
From Proteopedia
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| - | [[Image:2f3g. | + | [[Image:2f3g.jpg|left|200px]]<br /><applet load="2f3g" size="450" color="white" frame="true" align="right" spinBox="true" |
| - | <applet load="2f3g" size="450" color="white" frame="true" align="right" spinBox="true" | + | |
caption="2f3g, resolution 2.13Å" /> | caption="2f3g, resolution 2.13Å" /> | ||
'''IIAGLC CRYSTAL FORM III'''<br /> | '''IIAGLC CRYSTAL FORM III'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2F3G is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Protein-N(pi)-phosphohistidine--sugar_phosphotransferase Protein-N(pi)-phosphohistidine--sugar phosphotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.69 2.7.1.69] | + | 2F3G is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Protein-N(pi)-phosphohistidine--sugar_phosphotransferase Protein-N(pi)-phosphohistidine--sugar phosphotransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.1.69 2.7.1.69] Known structural/functional Site: <scene name='pdbsite=AVE:Molecule Is Transiently Phosphorylated At HIS 90'>AVE</scene>. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2F3G OCA]. |
==Reference== | ==Reference== | ||
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[[Category: signal transduction]] | [[Category: signal transduction]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Dec 18 19:32:22 2007'' |
Revision as of 17:22, 18 December 2007
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IIAGLC CRYSTAL FORM III
Overview
In Escherichia coli, the glucose-specific phosphocarrier protein of the, phosphotransferase system (PTS), IIAGlc (IIIGlc in older literature), is, also the central regulatory protein of the PTS. Depending upon its state, of phosphorylation, IIAGlc binds to a number of different proteins that, display no apparent sequence homology. Previous structural studies, suggested that nonspecific hydrophobic interactions, specific salt, bridges, and an intermolecular Zn(II) binding site contribute to the wide, latitude in IIAGlc binding sites. Two new crystal forms of IIAGlc have, been solved at high resolution, and the models were compared to those, previously studied. The major intermolecular contacts in the crystals, differ in detail, but all involve the hydrophobic active site of IIAGlc, interacting with a hydrophobic patch on a neighbor and all are shown to be, surprisingly similar to the physiologically relevant regulatory, interaction of IIAGlc with glycerol kinase. In two crystal forms, a helix, on one molecule interacts with the face of another, while in the other, crystal form, the primary crystal contact consists of a strand of, beta-sheet that contributes to an intermolecular Zn(II) binding site with, tetrahedral ligation identical to that of the zinc peptidase thermolysin., Thus, relatively nonspecific hydrophobic interactions combined with, specific salt bridges and an intermolecular cation binding site, (cation-promoted association) permit a regulatory protein to bind to, target proteins that have little or no sequence or structural homology, with one another. It is suggested that signal transduction by IIAGlc is a, binary switch in which phosphorylation at the active site directly, controls binding to target molecules.
About this Structure
2F3G is a Single protein structure of sequence from Escherichia coli. Active as Protein-N(pi)-phosphohistidine--sugar phosphotransferase, with EC number 2.7.1.69 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Structural studies of the Escherichia coli signal transducing protein IIAGlc: implications for target recognition., Feese MD, Comolli L, Meadow ND, Roseman S, Remington SJ, Biochemistry. 1997 Dec 23;36(51):16087-96. PMID:9405042
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