ジャーナル: J Biochem / 年: 2025 タイトル: Open and closed structures of L-arginine oxidase by cryo-electron microscopy and X-ray crystallography. 著者: Hiroki Yamaguchi / Kazutoshi Takahashi / Nobutaka Numoto / Hiroshi Suzuki / Moemi Tatsumi / Akiko Kamegawa / Kouki Nishikawa / Yasuhisa Asano / Toshimi Mizukoshi / Hiroshi Miyano / Yoshinori ...著者: Hiroki Yamaguchi / Kazutoshi Takahashi / Nobutaka Numoto / Hiroshi Suzuki / Moemi Tatsumi / Akiko Kamegawa / Kouki Nishikawa / Yasuhisa Asano / Toshimi Mizukoshi / Hiroshi Miyano / Yoshinori Fujiyoshi / Masayuki Sugiki / 要旨: L-arginine oxidase (AROD, EC 1.4.3.25) is an oxidoreductase that catalyses the deamination of L-arginine, with flavin adenine dinucleotide (FAD) as a cofactor. Recently identified AROD from ...L-arginine oxidase (AROD, EC 1.4.3.25) is an oxidoreductase that catalyses the deamination of L-arginine, with flavin adenine dinucleotide (FAD) as a cofactor. Recently identified AROD from Pseudomonas sp. TPU 7192 (PT-AROD) demonstrates high selectivity for L-arginine. This enzyme is useful for accurate assays of L-arginine in biological samples. The structural characteristics of the FAD-dependent AROD, however, remain unknown. Here, we report the structure of PT-AROD at a resolution of 2.3 Å by cryo-electron microscopy. PT-AROD adopts an octameric structure with D4 symmetry, which is consistent with its molecular weight in solution, estimated by mass photometry. Comparative analysis of this structure with that determined using X-ray crystallography reveals open and closed forms of the lid-like loop at the entrance to the substrate pocket. Furthermore, mutation of Glu493, located at the substrate binding site, diminishes substrate selectivity, suggesting that this residue contributes significantly to the high selectivity of PT-AROD.
プロトコル: SINGLE WAVELENGTH / 単色(M)・ラウエ(L): M / 散乱光タイプ: x-ray
放射波長
波長: 1 Å / 相対比: 1
反射
解像度: 3.4→49.23 Å / Num. obs: 39436 / % possible obs: 100 % / 冗長度: 6.7 % / Rmerge(I) obs: 0.346 / Rpim(I) all: 0.144 / Net I/σ(I): 4.6
反射 シェル
解像度: 3.4→3.47 Å / Rmerge(I) obs: 0.977 / Mean I/σ(I) obs: 2.1 / Num. unique obs: 4532 / Rpim(I) all: 0.401 / % possible all: 100
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解析
ソフトウェア
名称
バージョン
分類
REFMAC
5.8.0258
精密化
XDS
データ削減
Aimless
データスケーリング
PHASER
位相決定
精密化
構造決定の手法: 分子置換 / 解像度: 3.4→49.04 Å / Cor.coef. Fo:Fc: 0.937 / Cor.coef. Fo:Fc free: 0.845 / SU B: 50.64 / SU ML: 0.749 / 交差検証法: THROUGHOUT / ESU R Free: 0.748 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.31298
1970
5 %
RANDOM
Rwork
0.21198
-
-
-
obs
0.21698
37466
99.92 %
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溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK