The Q188R mutation in human galactose-1-phosphate uridylyltransferase acts as a partial dominant negative.

The Journal of Biological Chemistry
J P Elsevier, Judith L Fridovich-Keil

Abstract

A longstanding goal in the fields of molecular genetics and biochemistry has been to explain how naturally occurring mutations associated with human metabolic disease impair activity of the enzymes involved. This goal is particularly complex for enzymes composed of multiple subunits, because single mutations may exert both intra- and intersubunit effects on holoenzyme structure and function. We have previously applied a yeast coexpression system for human galactose-1-phosphate uridylyltransferase, a dimeric enzyme associated with galactosemia, to investigate the impact of naturally occurring mutations on subunit association and holoenzyme function (). Here we describe the purification and characterization of two heterodimers, R333W/wild type (WT) and Q188R/WT, revealing that although the first exhibits approximately 50% wild-type activity, the second exhibits only approximately 15% wild-type activity. Neither heterodimer varied significantly from the wild type with regard to apparent Km for either substrate, although Q188R/WT but not R333W/WT heterodimers demonstrated significantly increased thermal sensitivity relative to the wild-type enzyme. These results demonstrate for the first time a partial dominant negative effect caus...Continue Reading

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Citations

Oct 22, 2008·Journal of Inherited Metabolic Disease·Johannes Zschocke
Jan 16, 2013·Journal of Inherited Metabolic Disease·Emily L RyanJudith L Fridovich-Keil
Sep 5, 2002·Molecular Genetics and Metabolism·Nicole C Christacos, Judith L Fridovich-Keil
Dec 17, 2009·Protein Engineering, Design & Selection : PEDS·A Facchiano, A Marabotti
Jun 4, 2010·Disease Models & Mechanisms·Rebekah F KushnerJudith L Fridovich-Keil
Oct 1, 2014·Archives of Physiology and Biochemistry·Peter SchadewaldtUdo Wendel
Oct 28, 2009·IUBMB Life·Kent LaiKlaas J Wierenga
Oct 1, 2011·IUBMB Life·Thomas J McCorvie, David J Timson
Apr 16, 2013·Biochimica Et Biophysica Acta·Thomas J McCorvieDavid J Timson
Feb 26, 1999·The Journal of Biological Chemistry·K LaiL J Elsas
Dec 7, 2019·Journal of Inherited Metabolic Disease·Minela HaskovicM Estela Rubio-Gozalbo
Mar 23, 2001·Genetics in Medicine : Official Journal of the American College of Medical Genetics·L J Elsas, K Lai

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