2j4r: Difference between revisions

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{{STRUCTURE_2j4r|  PDB=2j4r  |  SCENE=  }}  
{{STRUCTURE_2j4r|  PDB=2j4r  |  SCENE=  }}  


'''STRUCTURAL STUDY OF THE AQUIFEX AEOLICUS PPX-GPPA ENZYME'''
===STRUCTURAL STUDY OF THE AQUIFEX AEOLICUS PPX-GPPA ENZYME===




==Overview==
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The crystal structure of the prototype exopolyphosphatase/guanosine pentaphosphate phosphohydrolase protein family member from Aquifex aeolicus in complex with the intracellular second messenger guanosine tetraphosphate was determined at 2.7-A resolution. The hydrolytic base is identified as E119. The dual specificity established for the Escherichia coli homolog is shown to be compatible with a common active site for guanosine pentaphosphate and polyphosphate hydrolysis. Distinct and different degrees of closure between the two domains of the enzyme are associated with substrate binding. The arginines R22 and R267, residing in different domains, are crucial for guanosine pentaphosphate specificity as they interact with the unique 3'-ribose phosphorylation.
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==About this Structure==
==About this Structure==
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==Reference==
==Reference==
Structure of the PPX/GPPA phosphatase from Aquifex aeolicus in complex with the alarmone ppGpp., Kristensen O, Ross B, Gajhede M, J Mol Biol. 2008 Feb 1;375(5):1469-76. Epub 2007 Dec 4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/18155044 18155044]
Structure of the PPX/GPPA phosphatase from Aquifex aeolicus in complex with the alarmone ppGpp., Kristensen O, Ross B, Gajhede M, J Mol Biol. 2008 Feb 1;375(5):1469-76. Epub 2007 Dec 4. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/18155044 18155044]
Structural characterization of the stringent response related exopolyphosphatase/guanosine pentaphosphate phosphohydrolase protein family., Kristensen O, Laurberg M, Liljas A, Kastrup JS, Gajhede M, Biochemistry. 2004 Jul 20;43(28):8894-900. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15248747 15248747]
[[Category: Aquifex aeolicus]]
[[Category: Aquifex aeolicus]]
[[Category: Single protein]]
[[Category: Single protein]]
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[[Category: Ppgpp]]
[[Category: Ppgpp]]
[[Category: Stringent response]]
[[Category: Stringent response]]
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