This work is supported in part by grants from National Natural Science Foundation of China (grants 39925017 and 39970168), the Ministry of Education of China and the 863 program from the Ministry of Science and Technology of China, the French Ministère de l'Education Nationale, de la Recherche et de la Technologie (Programme de Recherche Fondamentale de Microbiologie, Maladies Infectieuses et Parasitaires). We are grateful for the continuing support from Programme Franco-Chinois de Recherches Avancées (PRA), in association with the China National Center for Biotechnology Development of the Ministry of Science and Technology of China. Part of this work has been submitted to and accepted by Molecular Microbiology (2001).

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