Dynamic integration and excision of filamentous phage XacF1 in Xanthomonas citri pv. citri, the causative agent of citrus canker disease

作者：Ahmad Abdelmonim A; Kawabe Makoto; Askora Ahmed; Kawasaki Takeru; Fujie Makoto; Yamada Takashi^*

来源：FEBS Open Bio, 2017, 7(11): 1715-1721.

DOI：10.1002/2211-5463.12312

• biocontrol
• citrus canker
• filamentous phage
• integration mechanism
• XerC/D

Inovirus XacF1 (7325 nucleotides) is integrated into the genome of Xanthomonas citri pv. citri (Xcc) strains at the host dif site (attB) by the host XerC/D recombination system. The XacF1 attP sequence is located within the coding region of ORF12, a possible phage regulator. After integration, this open reading frame (ORF) is split into two pieces on the host genome. We examined dynamic integration/excision of XacF1 in Xcc strain MAFF 301080 and found that the integration started at 4 h postinfection (p.i.) and peaked at 12 h p.i. Thereafter, the ratio of integrated to free forms remained constant, suggesting equilibrium of integration and excision of XacF1 in the host genome. However, the integrated state became very unstable following a 5-deletion of ORF12 in XacF1, suggesting that ORF12 plays a key role in the integration cycle of XacF1 in Xcc strains.

• 出版日期2017-11