2gtv: Difference between revisions

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==Overview==

Although protein dynamics has been recognized as a potentially important, contributor to enzyme catalysis, structural disorder is generally, considered to reduce catalytic efficiency. This widely held assumption has, recently been challenged by the finding that an engineered chorismate, mutase combines high catalytic activity with the properties of a molten, globule, a loosely packed and highly dynamic conformational ensemble., Taking advantage of the ordering observed upon ligand binding, we have now, used NMR spectroscopy to characterize this enzyme in complex with a, transition-state analog. The complex adopts a helix-bundle structure, as, designed, but retains unprecedented flexibility on the millisecond, timescale across its entire length. Moreover, pre-steady-state kinetics, data show that binding occurs by an induced-fit mechanism on the same, timescale as the enzymatic reaction, linking global conformational, plasticity with efficient catalysis.

Although protein dynamics has been recognized as a potentially important contributor to enzyme catalysis, structural disorder is generally considered to reduce catalytic efficiency. This widely held assumption has recently been challenged by the finding that an engineered chorismate mutase combines high catalytic activity with the properties of a molten globule, a loosely packed and highly dynamic conformational ensemble. Taking advantage of the ordering observed upon ligand binding, we have now used NMR spectroscopy to characterize this enzyme in complex with a transition-state analog. The complex adopts a helix-bundle structure, as designed, but retains unprecedented flexibility on the millisecond timescale across its entire length. Moreover, pre-steady-state kinetics data show that binding occurs by an induced-fit mechanism on the same timescale as the enzymatic reaction, linking global conformational plasticity with efficient catalysis.

==About this Structure==

Line 10:

==Reference==

Structure and dynamics of a molten globular enzyme., Pervushin K, Vamvaca K, Vogeli B, Hilvert D, Nat Struct Mol Biol. 2007 Nov 11;. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17994104 17994104]

Structure and dynamics of a molten globular enzyme., Pervushin K, Vamvaca K, Vogeli B, Hilvert D, Nat Struct Mol Biol. 2007 Dec;14(12):1202-6. Epub 2007 Nov 11. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17994104 17994104]

[[Category: Chorismate mutase]]

[[Category: Methanocaldococcus jannaschii]]

[[Category: Single protein]]

[[Category: Vogeli, B.R.]]

[[Category: Vogeli, B R.]]

[[Category: TSA]]

[[Category: four-helix bundle]]

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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:35:20 2008''

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@@ Line 4: / Line 4: @@
 ==Overview==
-Although protein dynamics has been recognized as a potentially important, contributor to enzyme catalysis, structural disorder is generally, considered to reduce catalytic efficiency. This widely held assumption has, recently been challenged by the finding that an engineered chorismate, mutase combines high catalytic activity with the properties of a molten, globule, a loosely packed and highly dynamic conformational ensemble., Taking advantage of the ordering observed upon ligand binding, we have now, used NMR spectroscopy to characterize this enzyme in complex with a, transition-state analog. The complex adopts a helix-bundle structure, as, designed, but retains unprecedented flexibility on the millisecond, timescale across its entire length. Moreover, pre-steady-state kinetics, data show that binding occurs by an induced-fit mechanism on the same, timescale as the enzymatic reaction, linking global conformational, plasticity with efficient catalysis.
+Although protein dynamics has been recognized as a potentially important contributor to enzyme catalysis, structural disorder is generally considered to reduce catalytic efficiency. This widely held assumption has recently been challenged by the finding that an engineered chorismate mutase combines high catalytic activity with the properties of a molten globule, a loosely packed and highly dynamic conformational ensemble. Taking advantage of the ordering observed upon ligand binding, we have now used NMR spectroscopy to characterize this enzyme in complex with a transition-state analog. The complex adopts a helix-bundle structure, as designed, but retains unprecedented flexibility on the millisecond timescale across its entire length. Moreover, pre-steady-state kinetics data show that binding occurs by an induced-fit mechanism on the same timescale as the enzymatic reaction, linking global conformational plasticity with efficient catalysis.
 ==About this Structure==
@@ Line 10: / Line 10: @@
 ==Reference==
-Structure and dynamics of a molten globular enzyme., Pervushin K, Vamvaca K, Vogeli B, Hilvert D, Nat Struct Mol Biol. 2007 Nov 11;. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17994104 17994104]
+Structure and dynamics of a molten globular enzyme., Pervushin K, Vamvaca K, Vogeli B, Hilvert D, Nat Struct Mol Biol. 2007 Dec;14(12):1202-6. Epub 2007 Nov 11. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17994104 17994104]
 [[Category: Chorismate mutase]]
 [[Category: Methanocaldococcus jannaschii]]
 [[Category: Single protein]]
-[[Category: Vogeli, B.R.]]
+[[Category: Vogeli, B R.]]
 [[Category: TSA]]
 [[Category: four-helix bundle]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jan 23 12:02:09 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:35:20 2008''