PMID- 38112810 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20231222 IS - 2191-0855 (Print) IS - 2191-0855 (Electronic) IS - 2191-0855 (Linking) VI - 13 IP - 1 DP - 2023 Dec 19 TI - Klebsiella michiganensis: a nitrogen-fixing endohyphal bacterium from Ustilago maydis. PG - 146 LID - 10.1186/s13568-023-01618-8 [doi] LID - 146 AB - Ustilago maydis is a pathogenic fungus in Basidiomycota causing corn smut disease. A strain of U. maydis YZZF202006 was isolated from the tumor of corn smut collected from Jingzhou city in China. The intracellular bacteria were confirmed inner hyphal of the strain YZZF202006 by PCR amplification and fluorescence in situ hybridization (FISH) and SYTO-9. An endohyphal bacterium YZUMF202001 was isolated from the protoplasts of the strain YZZF202006. It was gram-negative, short rod-shaped with smooth light yellow colony. The endohyphal bacterium was genomic evidenced as Klebsiella michiganensis on the basis of average nucleotide identity (ANI) analysis and the phylogram. Then K. michiganensis was GFP-Labeled and reintroduced into U. maydis, which confirmed the bacterium can live in hyphae of U.maydis. The bacterium can grow on N-free culture media. Its nitrogenase activity was reached av. 646.25 +/- 38.61 nmol.mL(- 1).h(- 1) C(2)H(4) by acetylene reduction assay. A cluster of nitrogen fixation genes (nifJHDKTXENXUSVWZMFLABQ) was found from its genome. The endohyphal K. michiganensis may play an important role to help nitrogen fixation for fungi in the future. CI - (c) 2023. The Author(s). FAU - Liang, Pengyu AU - Liang P AD - Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, 434025, China. FAU - Jiang, Jianwei AU - Jiang J AD - Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, 434025, China. FAU - Sun, Zhengxiang AU - Sun Z AD - Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, 434025, China. FAU - Li, Yanyan AU - Li Y AD - Tobacco Research Institute of Hubei Province, Wuhan, 430000, China. FAU - Yang, Chunlei AU - Yang C AD - Tobacco Research Institute of Hubei Province, Wuhan, 430000, China. ycl193737@163.com. FAU - Zhou, Yi AU - Zhou Y AD - Department of Plant Protection, College of Agriculture, Yangtze University, Jingzhou, 434025, China. zhouyi@yangtzeu.edu.cn. LA - eng GR - 2020BBA051/the key research and development plan project of Hubei Province/ GR - 110202101013 (XJ-5)/Science and technology project of China National Tobacco Corporation/ GR - 027Y2022-023/Key science and technology projects of China National Tobacco Corporation in Hubei Province/ PT - Journal Article DEP - 20231219 PL - Germany TA - AMB Express JT - AMB Express JID - 101561785 PMC - PMC10730499 OTO - NOTNLM OT - Endohyphal bacterium OT - Klebsiella michiganensis OT - Nitrogen fixation OT - Ustilago maydis COIS- The authors declare no competing interests. EDAT- 2023/12/19 19:54 MHDA- 2023/12/19 19:55 PMCR- 2023/12/19 CRDT- 2023/12/19 11:17 PHST- 2023/01/26 00:00 [received] PHST- 2023/10/03 00:00 [accepted] PHST- 2023/12/19 19:55 [medline] PHST- 2023/12/19 19:54 [pubmed] PHST- 2023/12/19 11:17 [entrez] PHST- 2023/12/19 00:00 [pmc-release] AID - 10.1186/s13568-023-01618-8 [pii] AID - 1618 [pii] AID - 10.1186/s13568-023-01618-8 [doi] PST - epublish SO - AMB Express. 2023 Dec 19;13(1):146. doi: 10.1186/s13568-023-01618-8.