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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Biochemistry. 2019 Oct 7;59(34):3061–3063. doi: 10.1021/acs.biochem.9b00524

Fig. 2. Mechanism of BGAL1-mediated innate immune response in plant apoplast.

Fig. 2

Host BGAL1 removes modified viosamine from P. syringae flagellin, allowing further protease processing of the flagellin to release immunogenic peptides that bind host FL2 and initiate PAMP-triggered immunity (PTI). P. syringae strains can evade PTI by producing a small molecule inhibitor of BGAL1 or by altering the flagellin glycan so that it is no longer a BGAL1 substrate.