1 Bat SARS-like coronavirus WIV1 encodes an extra accessory protein ORFX 1 involved in modulation of host immune response 2 Lei-Ping Zeng 1, Yu-Tao Gao 1, Xing-Yi Ge 1, Qian Zhang1, Cheng Peng 1, Xing-Lou 3 Yang 1, Bing Tan 1, Jing Chen 1, Aleksei A. Chmura 2, Peter Daszak 2, Zheng-Li Shi1* 4 5 6 1 Key Laboratory of Special Pathogens, Wuhan Institute of Virology, Chinese 7 Academy of Sciences, Wuhan, 430071, China; 8 2 EcoHealth Alliance, 460 West 34th Street, New York, NY10001, USA 9 10 Running title: SL-CoV ORFX 11 12 Keywords: SARS-like coronavirus, ORFX, reverse genetics, interferon antagonist, 13 NF-κB activation 14 15 Word counts: 4823 for main text; 174 for abstract 16 17 * Correspondence: Zheng-Li Shi: