4UNM

Structure of Galactose Oxidase homologue from Streptomyces lividans

4UNM の概要

• エントリーDOI: 10.2210/pdb4unm/pdb
• 分子名称: SECRETED PROTEIN, COPPER (II) ION, ACETATE ION, ... (4 entities in total)
• 機能のキーワード: metal binding protein, copper oxidase
• 由来する生物種: STREPTOMYCES LIVIDANS
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 135452.64

構造登録者

Chaplin, A.K.,Hough, M.A.,Worrall, J.A.R. (登録日: 2014-05-29, 公開日: 2015-06-10, 最終更新日: 2024-01-10)

主引用文献

Chaplin, A.K.,Petrus, M.L.,Mangiameli, G.,Hough, M.A.,Svistunenko, D.A.,Nicholls, P.,Claessen, D.,Vijgenboom, E.,Worrall, J.A.
Glxa is a New Structural Member of the Radical Copper Oxidase Family and is Required for Glycan Deposition at Hyphal Tips and Morphogenesis of Streptomyces Lividans.
Biochem.J., 469:433-, 2015

PubMed Abstract: Streptomyces lividans displays a distinct dependence on copper to fully initiate morphological development. Evidence has accumulated to implicate the participation of an extracytoplasmic cuproenzyme in morphogenesis. In the present study, we show that GlxA fulfils all criteria to be that cuproenzyme. GlxA is membrane associated and has an active site consisting of a mononuclear copper and a cross-linked Y-C cofactor. The domain organization of the tertiary structure defines GlxA as a new structural member of the mono-copper oxidase family, with copper co-ordination geometry similar to, but spectroscopically distinct from fungal galactose oxidase (Gox). EPR spectroscopy reveals that the oxidation of cupric GlxA generates a protein radical residing on the Y-C cross-link. A variety of canonical Gox substrates (including D-galactose) were tested but none were readily turned over by GlxA. A glxA null-mutant leads to loss of glycan accumulation at hyphal tips and consequently a drastically changed morphology both on solid substrates and in liquid-grown environments, a scenario similarly observed in the absence of the neighbouring glycan synthase CslA (cellulase synthase-like protein). In addition the glxA mutant has lost the stimulation of development by copper, supporting a model whereby the enzymatic action of GlxA on the glycan is required for development and morphology. From a biotechnology perspective, the open mycelium morphology observed with the glxA mutant in submerged culture has implications for use as an enzyme production host.

PubMed: 26205496
DOI: 10.1042/BJ20150190

実験手法

X-RAY DIFFRACTION (1.77 Å)