Molecular structure of soluble trimeric HIV-1 glycoprotein gp140 KNH1144
マップデータ
For unliganded gp140 maps, z-pixels were scaled to compensate for elongation arising from preferential orientation of trimers with the 3-fold axis predominantly along the direction of the incident beam. The scaling factor was derived from single particle 3D reconstruction based on projection images of each particle from different tilts, which produces a noisier envelope that provides a measure of the shape of the molecule in the absence of distortions generated by the presence of the missing wedge.
ジャーナル: Proc Natl Acad Sci U S A / 年: 2011 タイトル: Trimeric HIV-1 glycoprotein gp140 immunogens and native HIV-1 envelope glycoproteins display the same closed and open quaternary molecular architectures. 著者: Audray Harris / Mario J Borgnia / Dan Shi / Alberto Bartesaghi / Haifeng He / Robert Pejchal / Yun Kenneth Kang / Rafael Depetris / Andre J Marozsan / Rogier W Sanders / Per Johan Klasse / ...著者: Audray Harris / Mario J Borgnia / Dan Shi / Alberto Bartesaghi / Haifeng He / Robert Pejchal / Yun Kenneth Kang / Rafael Depetris / Andre J Marozsan / Rogier W Sanders / Per Johan Klasse / Jacqueline L S Milne / Ian A Wilson / William C Olson / John P Moore / Sriram Subramaniam / 要旨: The initial step in HIV-1 infection occurs with the binding of cell surface CD4 to trimeric HIV-1 envelope glycoproteins (Env), a heterodimer of a transmembrane glycoprotein (gp41) and a surface ...The initial step in HIV-1 infection occurs with the binding of cell surface CD4 to trimeric HIV-1 envelope glycoproteins (Env), a heterodimer of a transmembrane glycoprotein (gp41) and a surface glycoprotein (gp120). The design of soluble versions of trimeric Env that display structural and functional properties similar to those observed on intact viruses is highly desirable from the viewpoint of designing immunogens that could be effective as vaccines against HIV/AIDS. Using cryoelectron tomography combined with subvolume averaging, we have analyzed the structure of SOSIP gp140 trimers, which are cleaved, solubilized versions of the ectodomain of trimeric HIV-1 Env. We show that unliganded gp140 trimers adopt a quaternary arrangement similar to that displayed by native unliganded trimers on the surface of intact HIV-1 virions. When complexed with soluble CD4, Fab 17b, which binds to gp120 at its chemokine coreceptor binding site, or both soluble CD4 and 17b Fab, gp140 trimers display an open conformation in which there is an outward rotation and displacement of each gp120 protomer. We demonstrate that the molecular arrangements of gp120 trimers in the closed and open conformations of the soluble trimer are the same as those observed for the closed and open states, respectively, of trimeric gp120 on intact HIV-1 BaL virions, establishing that soluble gp140 trimers can be designed to mimic the quaternary structural transitions displayed by native trimeric Env.
ダウンロード / ファイル: emd_5320.map.gz / 形式: CCP4 / 大きさ: 3.7 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
For unliganded gp140 maps, z-pixels were scaled to compensate for elongation arising from preferential orientation of trimers with the 3-fold axis predominantly along the direction of the incident beam. The scaling factor was derived from single particle 3D reconstruction based on projection images of each particle from different tilts, which produces a noisier envelope that provides a measure of the shape of the molecule in the absence of distortions generated by the presence of the missing wedge.