Carbohydrate recognition domain of surfactant protein D mediates interactions with Pneumocystis carinii glycoprotein A.

Carbohydrate recognition domain of surfactant protein D mediates interactions with Pneumocystis carinii glycoprotein A.
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表面活性剂蛋白 D 的碳水化合物识别域介导与卡氏肺囊虫糖蛋白 A 的相互作用。

DOI:
10.1165/ajrcmb.24.4.3504
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发表时间:
2001
影响因子:
6.4
通讯作者:
Limper,AH
Limper,AH
中科院分区:
医学1区
文献类型:
--
作者:
Vuk-Pavlovic,Z;Standing,JE;Crouch,EC;Limper,AH

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卡氏肺孢子虫可导致免疫功能低下患者的严重肺炎。肺表面活性蛋白D(SP-D)是一种肺集合素,在肺泡灌洗液中显著积聚。卡氏肺炎并与OFP表面的糖蛋白A(GPA)结合。Carinii,从而增强与肺泡巨噬细胞的相互作用。在此,我们报道了SP-D与GPA相互作用的结构基础。我们证明了天然SP-D在2 mM钙离子存在下以可饱和的、浓度依赖的方式与纯化的GPA结合,这种结合可被10 mM的乙二胺四乙酸所消除。在无阳离子条件下,增加钙离子浓度显著增强SP-D与GPA的结合,而锰和镁离子的影响很小。SP-D与GPA的结合在pH为7.4时达到最大值,在pH为4时有明显的抑制作用。麦芽糖、葡萄糖、甘露糖、N-乙酰氨基葡萄糖也竞争性抑制SP-D与GPA的结合。比较各种天然形式和重组形式的SP-D与GPA的结合,发现在给定的SP-D形式中的碳水化合物识别结构域(CRD)的数量决定了与GPA结合的相对程度。与天然SP-D(十二聚体和高阶SP-D复合体)的结合最大,其次是重组十二聚体。相反,重组全长三聚体表现出明显较少的结合,这与由CRD和Neck区域组成的包含该分子这一部分的三聚体的重组截短分子相似。综上所述,这些结果有力地表明,SP-D的CRD参与了与P的相互作用。CariniigpA通过其附着的寡糖与SP-D结合的程度最高。十二聚体和高阶形式的SP-D对Carinii的影响最大。
Pneumocystis cariniicontinues to cause severe pneumonia in immunocompromised patients. Surfactant protein D (SP-D), a lung collectin, markedly accumulates duringP. cariniipneumonia and binds to glycoprotein A (gpA) on the surface ofP. carinii, thereby enhancing interactions with alveolar macrophages. Herein, we report the structural basis of the interaction of SP-D with gpA. We demonstrate that natural SP-D binds to purified gpA in the presence of 2 mM calcium in a saturable, concentration-dependent manner, which is abolished by 10 mM ethylenediaminetetraacetic acid. Increasing concentrations of calcium under otherwise cation-free conditions significantly enhance SP-D binding to gpA, whereas manganese and magnesium cations have minimal effect. Maximal SP-D binding occurs at pH 7.4, with significant inhibition at pH 4. SP-D binding to gpA is also competitively inhibited by maltose > glucose > mannose > N-acetyl-glucosamine. Comparison of the binding of various natural and recombinant forms of SP-D to gpA reveals that the number of carbohydrate recognition domains (CRDs) in a given SP-D form determines the relative extent of binding to gpA. Maximal binding is observed with natural SP-D (dodecamers and higher order SP-D complexes) followed by recombinant dodecamers. In contrast, recombinant full-length trimers exhibit substantially less binding, which is similar to that observed with a recombinant truncated molecule consisting of the CRD and neck regions, and containing trimers of this portion of the molecule. Taken together, these findings strongly indicate that the CRD of SP-D mediates interaction withP. cariniigpA through its attached oligosaccharides and that the extent of SP-D binding toP. cariniiis greatest with dodecamers and higher order forms of SP-D.
玻连蛋白、纤连蛋白和 gp120 抗体可增强巨噬细胞响应卡氏肺囊虫而释放 TNF-α。
DOI: --
发表时间: 1994
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Neese,LW;Standing,JE;Olson,EJ;Castro,M;Limper,AH
通讯作者: Limper,AH
DOI: --
发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
Crouch,E;Chang,D;Rust,K;Persson,A;Heuser,J
通讯作者: Heuser,J
DOI: --
发表时间: 1993
期刊: European Journal of Biochemistry
影响因子: --
作者:
Jinhua Lu;H. Wiedemann;Uffe Holmskov;Steffen Thiel;R. Timpl;Kenneth B. M. Reid
通讯作者: Kenneth B. M. Reid
DOI: 10.4049/jimmunol.155.11.5343
发表时间: 1995-12
影响因子: 4.4
作者:
C. D. Gaynor;F. X. McCormack;D. Voelker;S. McGowan;L. Schlesinger
通讯作者: C. D. Gaynor;F. X. McCormack;D. Voelker;S. McGowan;L. Schlesinger
表面活性蛋白 D 与卡氏肺囊虫相互作用并介导生物体粘附到肺泡巨噬细胞。
DOI: 10.1172/jci117972
发表时间: 1995
期刊: The Journal of clinical investigation
影响因子: --
作者:
O'Riordan,DM;Standing,JE;Kwon,KY;Chang,D;Crouch,EC;Limper,AH
通讯作者: Limper,AH