Crystal structure of SARS-CoV-2 Orf9b in complex with human TOM70 suggests unusual virus-host interactions.
Crystal structure of SARS-CoV-2 Orf9b in complex with human TOM70 suggests unusual virus-host interactions.
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SARS-CoV-2 Orf9b 与人 TOM70 复合物的晶体结构表明病毒与宿主之间存在不寻常的相互作用
DOI：
10.1038/s41467-021-23118-8
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发表时间：
2021-05-14
影响因子：
16.6
通讯作者：
Cui S
中科院分区：
文献类型：
--
作者：
Gao X;Zhu K;Qin B;Olieric V;Wang M;Cui S
虽然辅助蛋白被认为对冠状病毒复制不是必需的，但越来越多的证据表明，它们对病毒与宿主的相互作用和发病机制至关重要。Orf9b是SARS-CoV-2和SARS-CoV独有的辅助蛋白。它通过靶向线粒体参与免疫逃避，在那里它与多功能适配器TOM70相关。在这里，我们确定了SARS-CoV-2 orf9b与人类TOM70细胞质段复合物的晶体结构至2.2 Å。orf9b的中心部分占据TOM70 c -末端结构域（CTD）的深孔，并采用与orf9b同型二聚体的富含β-薄片结构明显不同的螺旋构象。orf9b与TOM70 CTD之间的相互作用主要是疏水性的，不同于热休克蛋白90 (Hsp90) EEVD基序与TOM70 n端结构域（NTD）之间的静电相互作用。使用等温滴定量热法（ITC），我们证明orf9b二聚体不结合TOM70，但一个含有orf9b片段的合成肽（表示c肽）通过纳摩尔KD结合TOM70。虽然c肽与TOM70 CTD之间的相互作用是一个吸热过程，但Hsp90 EEVD与TOM70 NTD之间的相互作用是放热的，这强调了NTD和CTD口袋的不同结合机制。引人注目的是，当orf9b占据TOM70 CTD的口袋时，Hsp90 EEVD基序与TOM70 NTD的结合亲和力降低了约29倍，支持orf9b变变抑制Hsp90/TOM70相互作用的假设。我们的研究结果揭示了SARS-CoV-2 orf9b介导的干扰素反应抑制的机制。
Although the accessory proteins are considered non-essential for coronavirus replication, accumulating evidences demonstrate they are critical to virus-host interaction and pathogenesis. Orf9b is a unique accessory protein of SARS-CoV-2 and SARS-CoV. It is implicated in immune evasion by targeting mitochondria, where it associates with the versatile adapter TOM70. Here, we determined the crystal structure of SARS-CoV-2 orf9b in complex with the cytosolic segment of human TOM70 to 2.2 Å. A central portion of orf9b occupies the deep pocket in the TOM70 C-terminal domain (CTD) and adopts a helical conformation strikingly different from the β-sheet-rich structure of the orf9b homodimer. Interactions between orf9b and TOM70 CTD are primarily hydrophobic and distinct from the electrostatic interaction between the heat shock protein 90 (Hsp90) EEVD motif and the TOM70 N-terminal domain (NTD). Using isothermal titration calorimetry (ITC), we demonstrated that the orf9b dimer does not bind TOM70, but a synthetic peptide harboring a segment of orf9b (denoted C-peptide) binds TOM70 with nanomolar KD. While the interaction between C-peptide and TOM70 CTD is an endothermic process, the interaction between Hsp90 EEVD and TOM70 NTD is exothermic, which underscores the distinct binding mechanisms at NTD and CTD pockets. Strikingly, the binding affinity of Hsp90 EEVD motif to TOM70 NTD is reduced by ~29-fold when orf9b occupies the pocket of TOM70 CTD, supporting the hypothesis that orf9b allosterically inhibits the Hsp90/TOM70 interaction. Our findings shed light on the mechanism underlying SARS-CoV-2 orf9b mediated suppression of interferon responses.
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DOI：
10.1107/s0907444910045749
发表时间：
2011-04
期刊：
Acta crystallographica. Section D, Biological crystallography
影响因子：
--
作者：
Winn MD;Ballard CC;Cowtan KD;Dodson EJ;Emsley P;Evans PR;Keegan RM;Krissinel EB;Leslie AG;McCoy A;McNicholas SJ;Murshudov GN;Pannu NS;Potterton EA;Powell HR;Read RJ;Vagin A;Wilson KS
通讯作者：
Wilson KS
DOI：
10.1126/science.abe9403
发表时间：
2020-12-04
期刊：
Science (New York, N.Y.)
影响因子：
--
作者：
Gordon DE;Hiatt J;Bouhaddou M;Rezelj VV;Ulferts S;Braberg H;Jureka AS;Obernier K;Guo JZ;Batra J;Kaake RM;Weckstein AR;Owens TW;Gupta M;Pourmal S;Titus EW;Cakir M;Soucheray M;McGregor M;Cakir Z;Jang G;O'Meara MJ;Tummino TA;Zhang Z;Foussard H;Rojc A;Zhou Y;Kuchenov D;Hüttenhain R;Xu J;Eckhardt M;Swaney DL;Fabius JM;Ummadi M;Tutuncuoglu B;Rathore U;Modak M;Haas P;Haas KM;Naing ZZC;Pulido EH;Shi Y;Barrio-Hernandez I;Memon D;Petsalaki E;Dunham A;Marrero MC;Burke D;Koh C;Vallet T;Silvas JA;Azumaya CM;Billesbølle C;Brilot AF;Campbell MG;Diallo A;Dickinson MS;Diwanji D;Herrera N;Hoppe N;Kratochvil HT;Liu Y;Merz GE;Moritz M;Nguyen HC;Nowotny C;Puchades C;Rizo AN;Schulze-Gahmen U;Smith AM;Sun M;Young ID;Zhao J;Asarnow D;Biel J;Bowen A;Braxton JR;Chen J;Chio CM;Chio US;Deshpande I;Doan L;Faust B;Flores S;Jin M;Kim K;Lam VL;Li F;Li J;Li YL;Li Y;Liu X;Lo M;Lopez KE;Melo AA;Moss FR 3rd;Nguyen P;Paulino J;Pawar KI;Peters JK;Pospiech TH Jr;Safari M;Sangwan S;Schaefer K;Thomas PV;Thwin AC;Trenker R;Tse E;Tsui TKM;Wang F;Whitis N;Yu Z;Zhang K;Zhang Y;Zhou F;Saltzberg D;QCRG Structural Biology Consortium;Hodder AJ;Shun-Shion AS;Williams DM;White KM;Rosales R;Kehrer T;Miorin L;Moreno E;Patel AH;Rihn S;Khalid MM;Vallejo-Gracia A;Fozouni P;Simoneau CR;Roth TL;Wu D;Karim MA;Ghoussaini M;Dunham I;Berardi F;Weigang S;Chazal M;Park J;Logue J;McGrath M;Weston S;Haupt R;Hastie CJ;Elliott M;Brown F;Burness KA;Reid E;Dorward M;Johnson C;Wilkinson SG;Geyer A;Giesel DM;Baillie C;Raggett S;Leech H;Toth R;Goodman N;Keough KC;Lind AL;Zoonomia Consortium;Klesh RJ;Hemphill KR;Carlson-Stevermer J;Oki J;Holden K;Maures T;Pollard KS;Sali A;Agard DA;Cheng Y;Fraser JS;Frost A;Jura N;Kortemme T;Manglik A;Southworth DR;Stroud RM;Alessi DR;Davies P;Frieman MB;Ideker T;Abate C;Jouvenet N;Kochs G;Shoichet B;Ott M;Palmarini M;Shokat KM;García-Sastre A;Rassen JA;Grosse R;Rosenberg OS;Verba KA;Basler CF;Vignuzzi M;Peden AA;Beltrao P;Krogan NJ
通讯作者：
Krogan NJ
影响因子：
28.3
作者：
Gorbalenya, Alexander E.;Baker, Susan C.;Ziebuhr, John
通讯作者：
Ziebuhr, John
影响因子：
5.6
作者：
Mills, Ryan D.;Trewhella, Jill;Mulhern, Terrence D.
通讯作者：
Mulhern, Terrence D.
影响因子：
16.6
作者：
Douangamath A;Fearon D;Gehrtz P;Krojer T;Lukacik P;Owen CD;Resnick E;Strain-Damerell C;Aimon A;Ábrányi-Balogh P;Brandão-Neto J;Carbery A;Davison G;Dias A;Downes TD;Dunnett L;Fairhead M;Firth JD;Jones SP;Keeley A;Keserü GM;Klein HF;Martin MP;Noble MEM;O'Brien P;Powell A;Reddi RN;Skyner R;Snee M;Waring MJ;Wild C;London N;von Delft F;Walsh MA
通讯作者：
Walsh MA