2E3D

Crystal structure of E. coli glucose-1-phosphate uridylyltransferase

2E3D の概要

• エントリーDOI: 10.2210/pdb2e3d/pdb
• 分子名称: UTP--glucose-1-phosphate uridylyltransferase (2 entities in total)
• 機能のキーワード: udp-glucose, carbohydrate, pyrophosphorylase, transferase
• 由来する生物種: Escherichia coli
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 131920.91

構造登録者

Thoden, J.B.,Holden, H.M. (登録日: 2006-11-22, 公開日: 2006-12-12, 最終更新日: 2024-03-13)

主引用文献

Thoden, J.B.,Holden, H.M.
The molecular architecture of glucose-1-phosphate uridylyltransferase
Protein Sci., 16:432-440, 2007

PubMed Abstract: Glucose-1-phosphate uridylyltransferase, also referred to as UDP-glucose pyrophosphorylase or UGPase, catalyzes the formation of UDP-glucose from glucose-1-phosphate and UTP. Not surprisingly, given the central role of UDP-glucose in glycogen synthesis and in the production of glycolipids, glycoproteins, and proteoglycans, the enzyme is ubiquitous in nature. Interestingly, however, the prokaryotic and eukaryotic forms of the enzyme are unrelated in amino acid sequence and structure. Here we describe the cloning and structural analysis to 1.9 A resolution of the UGPase from Escherichia coli. The protein is a tetramer with 222 point group symmetry. Each subunit of the tetramer is dominated by an eight-stranded mixed beta-sheet. There are two additional layers of beta-sheet (two and three strands) and 10 alpha-helices. The overall fold of the molecule is remarkably similar to that observed for glucose-1-phosphate thymidylyltransferase in complex with its product, dTDP-glucose. On the basis of this similarity, a UDP-glucose moiety has been positioned into the active site of UGPase. This protein/product model predicts that the side chains of Gln 109 and Asp 137, respectively, serve to anchor the uracil ring and the ribose of UDP-glucose to the protein. The beta-phosphoryl group of the product is predicted to lie within hydrogen bonding distance to the epsilon-nitrogen of Lys 202 whereas the carboxylate group of Glu 201 is predicted to bridge the 2'- and 3'-hydroxyl groups of the glucosyl moiety. Details concerning the overall structure of UGPase and a comparison with glucose-1-phosphate thymidylyltransferase are presented.

PubMed: 17322528
DOI: 10.1110/ps.062626007

実験手法

X-RAY DIFFRACTION (1.95 Å)