谢旗,男，博士，研究员，博士生导师。
1987年中山大学学士。1990年广东省微生物研究所硕士。1994年西班牙Universidad de Madrid大学博士。1995年至1998年分别在Universidad de Madrid 及美国Rockefeller University继续博士后工作。1998年被聘为新加坡国立大学分子农业生物学学院Research Fellow，后任该学院植物细胞研究室执行主任。回国前任新加坡国立大学Temasek Life Sciences Laboratory分子与细胞研究室执行主任(Acting Principal Investigator)。2002年起任中山大学生命科学学院长江学者特聘教授。2003年国家杰出青年科学基金获得者。2004年中国科学院"百人计划"入选者。
谢旗博士的主要研究方向是泛素介导的蛋白修饰及植物逆境胁迫信号传导的分子机制。
主要研究内容：
1. 泛素蛋白酶体途径介导的蛋白修饰机制
泛素蛋白修饰（Ubiquitination）是真核生物特有的蛋白翻译后修饰，它直接或间接地调节生命活动中有关时空特异变化的生物学功能。虽然已在泛素蛋白酶体系统调控植物正常生长发育以及植物对环境响应研究方面取得了一些进展，但对其详细的信号传导机理尚待进一步探讨。尤其是在植物与环境的相互作用领域，关于蛋白泛素修饰参与植物抵抗逆境胁迫的作用机制的研究还处于起步阶段。基于双子叶植物拟南芥及单子叶植物水稻的基因组学和遗传学较其它植物研究得更为深入，我们将利用拟南芥和水稻为模式植物，着重于以下几个方面的研究：① 从功能基因组学方面研究拟南芥中不同E2家族成员的共性及特异性，并且建立适合各种调控途径的体外反应体系，研究E2与E3的特异性结合及生物学功能。② 研究拟南芥和水稻中单亚基类泛素蛋白连接酶（E3）的两大重要家族（RING finger及 U-box家族）的功能，采取点面结合的方式，利用基因组学、生物化学及遗传学手段阐明该类蛋白的功能网络、作用对象及机制。③ 试图阐明泛素蛋白降解对植物生长发育的调控机制以及在植物逆境胁迫中的调控机制.
 2. 植物与生物胁迫因子的相互作用及对非生物胁迫因子的响应及信号传导
我们分别利用正向和反向遗传学的方法，以模式植物拟南芥（Arabidopsis）为材料来研究植物对盐、干旱、冷等非生物胁迫的响应机制及信号传导途径，同时以模式植物小盐芥（Thellugiella halophila）来研究植物耐盐的分子机理。生长在华东地区海滩盐土上的本土植物种类小盐芥，符合作为遗传研究模式系统的各种标准，它的基因组大小接近拟南芥的两倍，但相对于拟南芥最高只能在75mM NaCl的浓度下完成其生活史，小盐芥则能在超过300mM NaCl浓度下完成生活史。因此，用小盐芥作为材料，通过系统的遗传学分析将有可能发现耐盐基因，揭示植物耐盐的分子机制。通过导入耐盐基因来获得抗逆的转基因经济作物，将扩大其种植范围和提高作物产量。
以双生病毒(Geminivirus)与植物的相互作用为模式研究植物与生物胁迫因子的相互作用。双生病毒是一组具有双生颗粒形态的单链环状植物DNA病毒。对双生病毒基因组结构、遗传表达机制、复制和转录调控机制及病毒与寄主的相互识别等方面进行深入研究，有助于揭示病毒与寄主植物相互间的作用方式。我们以甜菜曲顶卷叶病毒（Beet Curly Top Virus, BCTV）等双生病毒及模式植物拟南芥为材料, 结合基因组学、酵母双杂交系统及DNA芯片等技术来进行研究，目标是应用一种新的研究植物与病毒相互作用的方法研究植物与生物胁迫因子的相互作用，为防治由双生病毒引起的植物病害提出新的技术方案。
综合以上的研究领域以期最终能够揭示植物响应生物胁迫及非生物胁迫信号传导的交汇（Crosstalk）机制。
热忱欢迎对以上研究项目有兴趣的有志青年报考硕士、博士或联系博士后工作。
主要论著目录
H. Chen, Z. Zhang, K. Teng, J. Lai, Y. Zhang, Y. Huang, Y. Li, L. Liang, Y. Wang, C. Chu, H. Guo, Q. Xie. (2009).Up-regulation of LSB1/GDU3 impacts geminivirus infection by activating the salicylic acid pathway. Plant J, DOI: 10.1111/j.1365-313X.2009.04120.x
L. Liu, Y. Zhang, S. Tang, Q. Zhao, Z. Zhang, H. Zhang, L. Dong, H. Guo, Q. Xie. (2009).An efficient system to detect protein ubiquitination by agroinfiltration in Nicotiana benthamiana. Plant J, DOI: 10.1111/j.1365-313X.2009.04109.x
L. Huang, S. Yang, S. Zhang, M. Liu, J. Lai, Y. Qi, S. Shi, J. Wang, Y. Wang, Q. Xie, C. Yang. (2009).The Arabidopsis SUMO E3 ligase AtMMS21, a homologue of NSE2/MMS21, regulates cell proliferation in the root. Plant J, 60, 666-678.
Q. Bu, H. Li, Q. Zhao, H. Jiang, Q. Zhai, J. Zhang, X. Wu, J. Sun, Q. Xie, D. Wang, C. Li.(2009) The Arabidopsis RING finger E3 ligase RHA2a is a novel positive regulator of abscisic acid signaling during seed germination and early seedling development. Plant Physiol, 150, 463-481.
Lai, J., Chen, H., Teng, K., Zhao, Q., Zhang, Z., Li, Y., Liang, L., Xia, R., Wu, Y., Guo, H., and Xie, Q. (2009). RKP, a RING finger E3 ligase induced by BSCTV C4 protein, affects geminivirus infection by regulation of the plant cell cycle. Plant J. 57, 905-917
Yu, J.W., Rubio, V., Lee, N.Y., Bai, S., Lee, S.Y., Kim, S.S., Liu, L., Zhang, Y., Irigoyen, M.L., Sullivan, J.A., Zhang, Y., Lee, I., Xie, Q., Paek, N.C., and Deng, X.W. (2008). COP1 and ELF3 control circadian function and photoperiodic flowering by regulating GI stability. Mol Cell 32, 617-630
Liu, J., Zhang, Y., Qin, G., Tsuge, T., Sakaguchi, N., Luo, G., Sun, K., Shi, D., Aki, S., Zheng, N., Aoyama, T., Oka, A., Yang, W., Umeda, M., Xie, Q., Gu, H., and Qu, L.J. (2008). Targeted degradation of the cyclin-dependent kinase inhibitor ICK4/KRP6 by RING-type E3 ligases is essential for mitotic cell cycle progression during Arabidopsis gametogenesis. Plant Cell20,1538-1554
Du, Q., Duan, C., Zhang, Z., Fang, Y., Fang, R., Xie, Q., and Guo, H. DCL4 Targets Cucumber Mosaic Virus Satellite RNA at Novel Secondary Structures. Journal of Virology. published ahead of print on 3 July 2007, doi:10.1128/JVI.02885-06.
Zhang, Y., Yang, C., Li, Y., Zheng, N., Chen, H., Zhao, Q., Gao, T., Guo, H., and Xie, Q. (2007). SDIR1 Is a RING Finger E3 Ligase That Positively Regulates Stress-Responsive Abscisic Acid Signaling in Arabidopsis. Plant Cell 19, 1912-1929.
Chu, Z., Chen, H., Zhang, Y., Zhang, Z., Zheng, N., Yin, B., Yan, H., Zhu, L., Zhao, X., Yuan, M., Zhang, X., and Xie, Q. (2007). Knockout of the AtCESA2 gene affects microtubule orientation and causes abnormal cell expansion in Arabidopsis. Plant Physiol 143, 213-224.
Zou, J., Zhang, S., Zhang, W., Li, G., Chen, Z., Zhai, W., Zhao, X., Pan, X., Xie, Q., and Zhu, L. (2006). The rice HIGH-TILLERING DWARF1 encoding an ortholog of Arabidopsis MAX3 is required for negative regulation of the outgrowth of axillary buds. Plant J 48, 687-698.
Desvoyes, B., Ramirez-Parra, E., Xie, Q., Chua, N.H., and Gutierrez, C. (2006). Cell type-specific role of the retinoblastoma/E2F pathway during Arabidopsis leaf development. Plant Physiol 140, 67-80.
Dong, C.H., Agarwal, M., Zhang, Y., Xie, Q., and Zhu, J.K. (2006). The negative regulator of plant cold responses, HOS1, is a RING E3 ligase that mediates the ubiquitination and degradation of ICE1. Proc Natl Acad Sci USA103, 8281-8286.
Guo, H.S., Xie, Q., Fei, J.F., and Chua, N.H. (2005). MicroRNA directs mRNA cleavage of the transcription factor NAC1 to downregulate auxin signals for arabidopsis lateral root development. Plant Cell 17, 1376-1386.
Zeng, L.R., Qu, S., Bordeos, A., Yang, C., Baraoidan, M., Yan, H., Xie, Q., Nahm, B.H., Leung, H., and Wang, G.L. (2004). Spotted leaf11, a negative regulator of plant cell death and defense, encodes a U-box/armadillo repeat protein endowed with E3 ubiquitin ligase activity. Plant Cell 16, 2795-2808.
Guo, H.S., Fei, J.F., Xie, Q., and Chua, N.H. (2003). A chemical-regulated inducible RNAi system in plants. Plant J 34, 383-392.
Hu, Y., Xie, Q., and Chua, N.H. (2003). The Arabidopsis auxin-inducible gene ARGOS controls lateral organ size. Plant Cell 15, 1951-1961.
Xie, Q., Guo, H.S., Dallman, G., Fang, S., Weissman, A.M., and Chua, N.H. (2002). SINAT5 promotes ubiquitin-related degradation of NAC1 to attenuate auxin signals. Nature 419, 167-170. (Covery story)
Xie, Q., Frugis, G., Colgan, D., and Chua, N.H. (2000). Arabidopsis NAC1 transduces auxin signal downstream of TIR1 to promote lateral root development. Genes Dev 14, 3024-3036.
Xie, Q., Sanz-Burgos, A.P., Guo, H., Garcia, J.A., and Gutierrez, C. (1999). GRAB proteins, novel members of the NAC domain family, isolated by their interaction with a geminivirus protein. Plant Mol Biol 39, 647-656.
Ramirez-Parra, E., Xie, Q., Boniotti, M.B., and Gutierrez, C. (1999). The cloning of plant E2F, a retinoblastoma-binding protein, reveals unique and conserved features with animal G(1)/S regulators. Nucleic Acids Res 27, 3527-3533.
Xie, Q., Sanz-Burgos, A.P., Hannon, G.J., and Gutierrez, C. (1996). Plant cells contain a novel member of the retinoblastoma family of growth regulatory proteins. EMBO J 15, 4900-4908.
Xie, Q., Suarez-Lopez, P., and Gutierrez, C. (1995). Identification and analysis of a retinoblastoma binding motif in the replication protein of a plant DNA virus: requirement for efficient viral DNA replication. EMBO J 14, 4073-4082.
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