PMID: 29413322

Authors:

Carter M, Jemth AS, Carreras-Puigvert J, Herr P, Martinez Carranza M, Vallin KSA, Throup A, Helleday T, Stenmark P

Title:

Human NUDT22 Is a UDP-Glucose/Galactose Hydrolase Exhibiting a Unique Structural Fold.

Journal:

Structure. 2018 Feb 6;26(2):295-303.e6. doi: 10.1016/j.str.2018.01.004.

Abstract:

Human NUDT22 belongs to the diverse NUDIX family of proteins, but has, until now, remained uncharacterized. Here we show that human NUDT22 is a Mg(2+)-dependent UDP-glucose and UDP-galactose hydrolase, producing UMP and glucose 1-phosphate or galactose 1-phosphate. We present the structure of human NUDT22 alone and in a complex with the substrate UDP-glucose. These structures reveal a partially conserved NUDIX fold domain preceded by a unique N-terminal domain responsible for UDP moiety binding and recognition. The NUDIX domain of NUDT22 contains a modified NUDIX box identified using structural analysis and confirmed through functional analysis of mutants. Human NUDT22's distinct structure and function as a UDP-carbohydrate hydrolase establish a unique NUDIX protein subfamily.