1ebg
From Proteopedia
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| - | [[Image:1ebg.gif|left|200px]] | + | [[Image:1ebg.gif|left|200px]] |
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| - | '''CHELATION OF SER 39 TO MG2+ LATCHES A GATE AT THE ACTIVE SITE OF ENOLASE: STRUCTURE OF THE BIS(MG2+) COMPLEX OF YEAST ENOLASE AND THE INTERMEDIATE ANALOG PHOSPHONOACETOHYDROXAMATE AT 2.1 ANGSTROMS RESOLUTION''' | + | {{Structure |
| + | |PDB= 1ebg |SIZE=350|CAPTION= <scene name='initialview01'>1ebg</scene>, resolution 2.1Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene> and <scene name='pdbligand=PAH:PHOSPHONOACETOHYDROXAMIC ACID'>PAH</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Phosphopyruvate_hydratase Phosphopyruvate hydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.11 4.2.1.11] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''CHELATION OF SER 39 TO MG2+ LATCHES A GATE AT THE ACTIVE SITE OF ENOLASE: STRUCTURE OF THE BIS(MG2+) COMPLEX OF YEAST ENOLASE AND THE INTERMEDIATE ANALOG PHOSPHONOACETOHYDROXAMATE AT 2.1 ANGSTROMS RESOLUTION''' | ||
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==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1EBG is a [ | + | 1EBG is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EBG OCA]. |
==Reference== | ==Reference== | ||
| - | Chelation of serine 39 to Mg2+ latches a gate at the active site of enolase: structure of the bis(Mg2+) complex of yeast enolase and the intermediate analog phosphonoacetohydroxamate at 2.1-A resolution., Wedekind JE, Poyner RR, Reed GH, Rayment I, Biochemistry. 1994 Aug 9;33(31):9333-42. PMID:[http:// | + | Chelation of serine 39 to Mg2+ latches a gate at the active site of enolase: structure of the bis(Mg2+) complex of yeast enolase and the intermediate analog phosphonoacetohydroxamate at 2.1-A resolution., Wedekind JE, Poyner RR, Reed GH, Rayment I, Biochemistry. 1994 Aug 9;33(31):9333-42. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/8049235 8049235] |
[[Category: Phosphopyruvate hydratase]] | [[Category: Phosphopyruvate hydratase]] | ||
[[Category: Saccharomyces cerevisiae]] | [[Category: Saccharomyces cerevisiae]] | ||
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[[Category: carbon-oxygen lyase]] | [[Category: carbon-oxygen lyase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:53:07 2008'' |
Revision as of 08:53, 20 March 2008
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| , resolution 2.1Å | |||||||
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| Ligands: | and | ||||||
| Activity: | Phosphopyruvate hydratase, with EC number 4.2.1.11 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CHELATION OF SER 39 TO MG2+ LATCHES A GATE AT THE ACTIVE SITE OF ENOLASE: STRUCTURE OF THE BIS(MG2+) COMPLEX OF YEAST ENOLASE AND THE INTERMEDIATE ANALOG PHOSPHONOACETOHYDROXAMATE AT 2.1 ANGSTROMS RESOLUTION
Overview
The structure of a new crystal form of enolase from bakers' yeast has been solved to 2.1-A resolution. Crystals were grown from poly(ethylene glycol) and KCl at pH 8.2 in the presence of Mg2+ and a reaction intermediate analog, phosphonoacetohydroxamate (PhAH). Crystals belong to space group C2; have unit cell dimensions a = 123.5 A, b = 73.9 A, and c = 94.8 A with beta = 93.3 degrees; and contain one dimer per asymmetric unit. The structure was solved by molecular replacement from the X-ray coordinates of apoenolase [Stec, B., & Lebioda, L. (1990) J. Mol. Biol. 211, 235-248]. Both essential divalent metal ions are observed to be complexed with the inhibitor. The two Mg2+ ions are 4.05 A apart and are bridged by a mu-oxyl ligand from the carbonyl moiety of PhAH. The "high-affinity" Mg2+ coordinates to the carboxylate side chains of Asp 246, Glu 295, and Asp 320, one water molecule, and the hydroxamate and carbonyl oxygens of PhAH. The second Mg2+ coordinates to a phosphonyl oxygen, two water molecules, and the mu-bridge carbonyl oxygen of PhAH. Coordination schemes with respect to PhAH and water ligands are fully consistent with those of the Mn2+ complexes determined spectroscopically [Poyner, R.R., & Reed, G. H. (1992) Biochemistry 31, 7166-7173]. Remaining ligands for the second Mg2+ are the carbonyl oxygen and gamma-oxygen of Ser 39. Chelation of this Ser residue to Mg2+ effectively "latches" a flexible loop extending from Gly 37 through His 43 and closes off the entrance to the active site. The position of the second Mg2+ in the active site provides new insight into the stereochemistry of substrate binding.
About this Structure
1EBG is a Single protein structure of sequence from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
Chelation of serine 39 to Mg2+ latches a gate at the active site of enolase: structure of the bis(Mg2+) complex of yeast enolase and the intermediate analog phosphonoacetohydroxamate at 2.1-A resolution., Wedekind JE, Poyner RR, Reed GH, Rayment I, Biochemistry. 1994 Aug 9;33(31):9333-42. PMID:8049235
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