3QAY

Catalytic domain of CD27L endolysin targeting Clostridia Difficile

3QAY の概要

• エントリーDOI: 10.2210/pdb3qay/pdb
• 分子名称: Endolysin, ZINC ION, PHOSPHATE ION, ... (4 entities in total)
• 機能のキーワード: amidase a/b fold, lyase
• 由来する生物種: Clostridium phage phiCD27
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 81839.52

構造登録者

Mayer, M.J.,Garefaliki, V.,Spoerl, R.,Narbad, A.,Meijers, R. (登録日: 2011-01-12, 公開日: 2011-12-28, 最終更新日: 2023-09-13)

主引用文献

Mayer, M.J.,Garefalaki, V.,Spoerl, R.,Narbad, A.,Meijers, R.
Structure-based modification of a Clostridium difficile-targeting endolysin affects activity and host range.
J.Bacteriol., 193:5477-5486, 2011

PubMed Abstract: Endolysin CD27L causes cell lysis of the pathogen Clostridium difficile, a major cause of nosocomial infection. We report a structural and functional analysis of the catalytic activity of CD27L against C. difficile and other bacterial strains. We show that truncation of the endolysin to the N-terminal domain, CD27L1-179, gave an increased lytic activity against cells of C. difficile, while the C-terminal region, CD27L180-270, failed to produce lysis. CD27L1-179 also has increased activity against other bacterial species that are targeted by the full-length protein and in addition was able to lyse some CD27L-insensitive strains. However, CD27L1-179 retained a measure of specificity, failing to lyse a wide range of bacteria. The use of green fluorescent protein (GFP)-labeled proteins demonstrated that both CD27L and CD27L1-179 bound to C. difficile cell walls. The crystal structure of CD27L1-179 confirms that the enzyme is a zinc-dependent N-acetylmuramoyl-l-alanine amidase. A structure-based sequence analysis allowed us to identify four catalytic residues, a proton relay cascade, and a substrate binding pocket. A BLAST search shows that the closest-related amidases almost exclusively target Clostridia. This implied that the catalytic domain alone contained features that target a specific bacterial species. To test this hypothesis, we modified Leu 98 to a Trp residue which is found in an endolysin from a bacteriophage of Listeria monocytogenes (PlyPSA). This mutation in CD27L resulted in an increased activity against selected serotypes of L. monocytogenes, demonstrating the potential to tune the species specificity of the catalytic domain of an endolysin.

PubMed: 21803993
DOI: 10.1128/JB.00439-11

実験手法

X-RAY DIFFRACTION (2 Å)