2E9L

Crystal Structure of human Cytosolic Neutral beta-Glycosylceramidase (Klotho-related Prote:KLrP) complex with Glucose and fatty acids

2E9L の概要

• エントリーDOI: 10.2210/pdb2e9l/pdb
• 関連するPDBエントリー: 2E9M
• 分子名称: Cytosolic beta-glucosidase, beta-D-glucopyranose, PALMITIC ACID, ... (6 entities in total)
• 機能のキーワード: novel cytosolic neutral beta-glycosylceramidase, hydrolase
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm, cytosol: Q9H227
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 55003.13

構造登録者

Kakuta, Y.,Hayashi, Y.,Okino, N.,Ito, M. (登録日: 2007-01-25, 公開日: 2007-09-11, 最終更新日: 2023-10-25)

主引用文献

Hayashi, Y.,Okino, N.,Kakuta, Y.,Shikanai, T.,Tani, M.,Narimatsu, H.,Ito, M.
Klotho-related protein is a novel cytosolic neutral beta-glycosylceramidase.
J.Biol.Chem., 282:30889-30900, 2007

PubMed Abstract: Using C6-NBD-glucosylceramide (GlcCer) as a substrate, we detected the activity of a conduritol B epoxide-insensitive neutral glycosylceramidase in cytosolic fractions of zebrafish embryos, mouse and rat brains, and human fibroblasts. The candidates for the enzyme were assigned to the Klotho (KL), whose family members share a beta-glucosidase-like domain but whose natural substrates are unknown. Among this family, only the KL-related protein (KLrP) is capable of degrading C6-NBD-GlcCer when expressed in CHOP cells, in which Myc-tagged KLrP was exclusively distributed in the cytosol. In addition, knockdown of the endogenous KLrP by small interfering RNA increased the cellular level of GlcCer. The purified recombinant KLrP hydrolyzed 4-methylumbelliferyl-glucose, C6-NBD-GlcCer, and authentic GlcCer at pH 6.0. The enzyme also hydrolyzed the corresponding galactosyl derivatives, but each k(cat)/Km was much lower than that for glucosyl derivatives. The x-ray structure of KLrP at 1.6A resolution revealed that KLrP is a (beta/alpha)8 TIM barrel, in which Glu(165) and Glu(373) at the carboxyl termini of beta-strands 4 and 7 could function as an acid/base catalyst and nucleophile, respectively. The substrate-binding cleft of the enzyme was occupied with palmitic acid and oleic acid when the recombinant protein was crystallized in a complex with glucose. GlcCer was found to fit well the cleft of the crystal structure of KLrP. Collectively, KLrP was identified as a cytosolic neutral glycosylceramidase that could be involved in a novel nonlysosomal catabolic pathway of GlcCer.

PubMed: 17595169
DOI: 10.1074/jbc.M700832200

実験手法

X-RAY DIFFRACTION (1.6 Å)