2cgo: Difference between revisions

Revision as of 17:48, 21 February 2008

FACTOR INHIBITING HIF-1 ALPHA WITH FUMARATE

OverviewOverview

In humans both the levels and activity of the alpha-subunit of the hypoxia-inducible transcription factor (HIF-alpha) are regulated by its post-translation hydroxylation as catalyzed by iron- and 2-oxoglutarate (2OG)-dependent prolyl and asparaginyl hydroxylases (PHD1-3 and factor-inhibiting HIF (FIH), respectively). One consequence of hypoxia is the accumulation of tricarboxylic acid cycle intermediates (TCAIs). In vitro assays were used to assess non-2OG TCAIs as inhibitors of purified PHD2 and FIH. Under the assay conditions, no significant FIH inhibition was observed by the TCAIs or pyruvate, but fumarate, succinate, and isocitrate inhibited PHD2. Mass spectrometric analyses under nondenaturing conditions were used to investigate the binding of TCAIs to PHD2 and supported the solution studies. X-ray crystal structures of FIH in complex with Fe(II) and fumarate or succinate revealed similar binding modes for each in the 2OG co-substrate binding site. The in vitro results suggest that the cellular inhibition of PHD2, but probably not FIH, by fumarate and succinate may play a role in the Warburg effect providing that appropriate relative concentrations of the components are achieved under physiological conditions.

About this StructureAbout this Structure

2CGO is a Single protein structure of sequence from Homo sapiens with , and as ligands. Active as Peptide-aspartate beta-dioxygenase, with EC number 1.14.11.16 Known structural/functional Site: . Full crystallographic information is available from OCA.

ReferenceReference

Structural and mechanistic studies on the inhibition of the hypoxia-inducible transcription factor hydroxylases by tricarboxylic acid cycle intermediates., Hewitson KS, Lienard BM, McDonough MA, Clifton IJ, Butler D, Soares AS, Oldham NJ, McNeill LA, Schofield CJ, J Biol Chem. 2007 Feb 2;282(5):3293-301. Epub 2006 Nov 29. PMID:17135241

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OCA

@@ Line 4: / Line 4: @@
 ==Overview==
-In humans both the levels and activity of the alpha-subunit of the, hypoxia-inducible transcription factor (HIF-alpha) are regulated by its, post-translation hydroxylation as catalyzed by iron- and 2-oxoglutarate, (2OG)-dependent prolyl and asparaginyl hydroxylases (PHD1-3 and, factor-inhibiting HIF (FIH), respectively). One consequence of hypoxia is, the accumulation of tricarboxylic acid cycle intermediates (TCAIs). In, vitro assays were used to assess non-2OG TCAIs as inhibitors of purified, PHD2 and FIH. Under the assay conditions, no significant FIH inhibition, was observed by the TCAIs or pyruvate, but fumarate, succinate, and, isocitrate inhibited PHD2. Mass spectrometric analyses under nondenaturing, conditions were used to investigate the binding of TCAIs to PHD2 and, supported the solution studies. X-ray crystal structures of FIH in complex, with Fe(II) and fumarate or succinate revealed similar binding modes for, each in the 2OG co-substrate binding site. The in vitro results suggest, that the cellular inhibition of PHD2, but probably not FIH, by fumarate, and succinate may play a role in the Warburg effect providing that, appropriate relative concentrations of the components are achieved under, physiological conditions.
+In humans both the levels and activity of the alpha-subunit of the hypoxia-inducible transcription factor (HIF-alpha) are regulated by its post-translation hydroxylation as catalyzed by iron- and 2-oxoglutarate (2OG)-dependent prolyl and asparaginyl hydroxylases (PHD1-3 and factor-inhibiting HIF (FIH), respectively). One consequence of hypoxia is the accumulation of tricarboxylic acid cycle intermediates (TCAIs). In vitro assays were used to assess non-2OG TCAIs as inhibitors of purified PHD2 and FIH. Under the assay conditions, no significant FIH inhibition was observed by the TCAIs or pyruvate, but fumarate, succinate, and isocitrate inhibited PHD2. Mass spectrometric analyses under nondenaturing conditions were used to investigate the binding of TCAIs to PHD2 and supported the solution studies. X-ray crystal structures of FIH in complex with Fe(II) and fumarate or succinate revealed similar binding modes for each in the 2OG co-substrate binding site. The in vitro results suggest that the cellular inhibition of PHD2, but probably not FIH, by fumarate and succinate may play a role in the Warburg effect providing that appropriate relative concentrations of the components are achieved under physiological conditions.
 ==About this Structure==
@@ Line 14: / Line 14: @@
 [[Category: Peptide-aspartate beta-dioxygenase]]
 [[Category: Single protein]]
-[[Category: Clifton, I.J.]]
+[[Category: Clifton, I J.]]
-[[Category: Mcdonough, M.A.]]
+[[Category: Mcdonough, M A.]]
-[[Category: Schofield, C.J.]]
+[[Category: Schofield, C J.]]
 [[Category: FE]]
 [[Category: FMR]]
@@ Line 44: / Line 44: @@
 [[Category: transcription regulation]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Feb  3 10:35:06 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:48:25 2008''