7V6M

Crystal structure of lacto-N-biosidase TnX from Tynzenella nexilis, lacto-N-biose complex

7V6M の概要

• エントリーDOI: 10.2210/pdb7v6m/pdb
• 分子名称: Fibronectin type III domain-containing protein, beta-D-galactopyranose-(1-3)-2-acetamido-2-deoxy-beta-D-glucopyranose (3 entities in total)
• 機能のキーワード: glycoside hydrolase, lacto-n-biosidase, lacto-n-biose complex, hydrolase
• 由来する生物種: Tyzzerella nexilis
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 65248.84

構造登録者

Yamada, C.,Fushinobu, S. (登録日: 2021-08-20, 公開日: 2022-02-09, 最終更新日: 2023-11-29)

主引用文献

Yamada, C.,Katayama, T.,Fushinobu, S.
Crystal structures of glycoside hydrolase family 136 lacto-N-biosidases from monkey gut- and human adult gut bacteria.
Biosci.Biotechnol.Biochem., 86:464-475, 2022

PubMed Abstract: Glycoside hydrolase family 136 (GH136) was established after the discovery and structural analysis of lacto-N-biosidase (LNBase) from the infant gut bacterium Bifidobacterium longum subsp. longum JCM1217 (BlLnbX). Homologous genes of BlLnbX are widely distributed in the genomes of human gut bacteria and monkey Bifidobacterium spp., although only 2 crystal structures were reported in the GH136 family. Cell suspensions of Bifidobacterium saguini, Tyzzerella nexilis, and Ruminococcus lactaris exhibited the LNBase activity. Recombinant LNBases of these 3 species were functionally expressed with their specific chaperones in Escherichia coli, and their kinetic parameters against p-nitrophenol substrates were determined. The crystal structures of the LNBases from B. saguini and T. nexilis in complex with lacto-N-biose I were determined at 2.51 and 1.92 Å resolutions, respectively. These structures conserve a β-helix fold characteristic of GH136 and the catalytic residues, but they lack the metal ions that were present in BlLnbX.

PubMed: 35092420
DOI: 10.1093/bbb/zbac015

実験手法

X-RAY DIFFRACTION (1.92 Å)