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. 2022 Nov 29;9:961354. doi: 10.3389/fvets.2022.961354

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Copyright © 2022 Wang, Deng, Ren, Liang, Li, Niu, Wu, Zhao, Gao, Yan, Liu, Ma, Tian and Yan.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Analysis of RAP44 integrase and genomic island in R. anatipestifer. (A) Integrase gene with P1/P2 primer pairs was detected in R. anatipestifer ATCC 11845, RA-YM, and 20 R. anatipestifer clinical isolated strains. (B) Detecting of integrase in R. anatipestifer clinical isolated strain with primer pair P1/P2. Lane 1: R. anatipestifer ATCC11845 strain; lane 2, R. anatipestifer YM strain; lanes 3–22: 20 clinical isolated strains no. 1–20; lane 23: negative control; ATCC 11845, RA-YM, and clinical isolated strain no. 9 with the integrase. (C) Sequence alignment analysis shows that the integrase was tyrosine integrase and highly conserved in R. anatipestifer. (D) Phyre² was applied to predict the integrase protein 3D structure. We found that the integrase protein structure is similar to tyrosine recombinase Cre.