1EGU

CRYSTAL STRUCTURE OF STREPTOCOCCUS PNEUMONIAE HYALURONATE LYASE AT 1.56 A RESOLUTION

1EGU の概要

• エントリーDOI: 10.2210/pdb1egu/pdb
• 分子名称: HYALURONATE LYASE, SULFATE ION (3 entities in total)
• 機能のキーワード: (alfa5/alfa5) barrel, lyase
• 由来する生物種: Streptococcus pneumoniae
• 細胞内の位置: Secreted, cell wall; Peptidoglycan-anchor (Potential): Q54873
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 83754.06

構造登録者

Li, S.,Kelly, S.J.,Lamani, E.,Ferraroni, M.,Jedrzejas, M.J. (登録日: 2000-02-16, 公開日: 2001-02-16, 最終更新日: 2024-02-07)

主引用文献

Li, S.,Kelly, S.J.,Lamani, E.,Ferraroni, M.,Jedrzejas, M.J.
Structural basis of hyaluronan degradation by Streptococcus pneumoniae hyaluronate lyase.
EMBO J., 19:1228-1240, 2000

PubMed Abstract: Streptococcus pneumoniae hyaluronate lyase (spnHL) is a pathogenic bacterial spreading factor and cleaves hyaluronan, an important constituent of the extra- cellular matrix of connective tissues, through an enzymatic beta-elimination process, different from the hyaluronan degradation by hydrolases in animals. The mechanism of hyaluronan binding and degradation was proposed based on the 1.56 A resolution crystal structure, substrate modeling and mutagenesis studies on spnHL. Five mutants, R243V, N349A, H399A, Y408F and N580G, were constructed and their activities confirmed our mechanism hypothesis. The important roles of Tyr408, Asn349 and His399 in enzyme catalysis were proposed, explained and confirmed by mutant studies. The remaining weak enzymatic activity of the H399A mutant, the role of the free carboxylate group on the glucuronate residue, the enzymatic behavior on chondroitin and chondroitin sulfate, and the small activity increase in the N580G mutant were explained based on this mechanism. A possible function of the C-terminal beta-sheet domain is to modulate enzyme activity through binding to calcium ions.

PubMed: 10716923
DOI: 10.1093/emboj/19.6.1228

実験手法

X-RAY DIFFRACTION (1.56 Å)