ジャーナル: Open Biol / 年: 2014 タイトル: The basic keratin 10-binding domain of the virulence-associated pneumococcal serine-rich protein PsrP adopts a novel MSCRAMM fold. 著者: Tim Schulte / Jonas Löfling / Cecilia Mikaelsson / Alexey Kikhney / Karina Hentrich / Aurora Diamante / Christine Ebel / Staffan Normark / Dmitri Svergun / Birgitta Henriques-Normark / Adnane Achour / 要旨: Streptococcus pneumoniae is a major human pathogen, and a leading cause of disease and death worldwide. Pneumococcal invasive disease is triggered by initial asymptomatic colonization of the human ...Streptococcus pneumoniae is a major human pathogen, and a leading cause of disease and death worldwide. Pneumococcal invasive disease is triggered by initial asymptomatic colonization of the human upper respiratory tract. The pneumococcal serine-rich repeat protein (PsrP) is a lung-specific virulence factor whose functional binding region (BR) binds to keratin-10 (KRT10) and promotes pneumococcal biofilm formation through self-oligomerization. We present the crystal structure of the KRT10-binding domain of PsrP (BR187-385) determined to 2.0 Å resolution. BR187-385 adopts a novel variant of the DEv-IgG fold, typical for microbial surface components recognizing adhesive matrix molecules adhesins, despite very low sequence identity. An extended β-sheet on one side of the compressed, two-sided barrel presents a basic groove that possibly binds to the acidic helical rod domain of KRT10. Our study also demonstrates the importance of the other side of the barrel, formed by extensive well-ordered loops and stabilized by short β-strands, for interaction with KRT10.
手法: 蒸気拡散法, シッティングドロップ法 詳細: 0.2 M LITHIUM SULFATE, 0.1 M SODIUM ACETATE TRIHYDRATE PH 4.6, 25% PEG4000 (W/V) USING THE SITTING DROP VAPOR-DIFFUSION METHOD FOLLOWED BY MICRO-SEEDING
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: 0.97932 Å / 相対比: 1
反射
解像度: 2.25→48.35 Å / Num. obs: 61680 / % possible obs: 100 % / Observed criterion σ(I): 3.2 / 冗長度: 4.6 % / Biso Wilson estimate: 36.12 Å2 / Rmerge(I) obs: 0.06 / Net I/σ(I): 14.8
反射 シェル
解像度: 2.25→2.31 Å / 冗長度: 4.4 % / Rmerge(I) obs: 0.49 / Mean I/σ(I) obs: 3.18 / % possible all: 100
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解析
ソフトウェア
名称
バージョン
分類
PHENIX
(PHENIX.REFINE: 1.8.1_1168)
精密化
XDS
データ削減
XSCALE
データスケーリング
Auto-Rickshaw
位相決定
精密化
構造決定の手法: 単波長異常分散 開始モデル: NONE 解像度: 2.25→48.35 Å / SU ML: 0.22 / σ(F): 1.31 / 位相誤差: 21.32 / 立体化学のターゲット値: ML 詳細: NCS AND REFERENCE MODEL TORSION RESTRAINT WERE APPLIED TO CHAINS B/C AND CHAIN A, RESPECTIVELY. CRYSTAL PACKING ANALYSIS REVEALED THAT THE OVERALL MOBILITY OF CHAIN A WAS RELATIVELY HIGHER ...詳細: NCS AND REFERENCE MODEL TORSION RESTRAINT WERE APPLIED TO CHAINS B/C AND CHAIN A, RESPECTIVELY. CRYSTAL PACKING ANALYSIS REVEALED THAT THE OVERALL MOBILITY OF CHAIN A WAS RELATIVELY HIGHER COMPARED TO THE MOBILITY OF CHAINS B AND C, AS REFLECTED BY HIGHER OVERALL B-FACTOR VALUES AND LOWER MAP CORRELATION COEFFICIENTS.
Rfactor
反射数
%反射
Rfree
0.2145
3090
5 %
Rwork
0.186
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-
obs
0.1874
61669
99.91 %
溶媒の処理
減衰半径: 0.9 Å / VDWプローブ半径: 1.11 Å / 溶媒モデル: FLAT BULK SOLVENT MODEL