LtrA is critical for biofilm formation and colonization of Vibrio parahaemolyticus on food-related surfaces

Shuhui Xiong; Nan Zhang; Hui Sun; Miaomiao Zhang; Xue Li; Xi Luo; Yiquan Zhang; Renfei Lu

doi:10.1016/j.ijfoodmicro.2025.111327

LtrA is critical for biofilm formation and colonization of Vibrio parahaemolyticus on food-related surfaces

Int J Food Microbiol. 2025 Jun 24:441:111327. doi: 10.1016/j.ijfoodmicro.2025.111327. Online ahead of print.

Authors

Shuhui Xiong¹, Nan Zhang², Hui Sun¹, Miaomiao Zhang³, Xue Li⁴, Xi Luo⁴, Yiquan Zhang⁵, Renfei Lu⁶

Affiliations

¹ Department of Clinical Laboratory, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu, China; School of Medicine, Nantong University, Nantong 226001, Jiangsu, China.
² Department of Clinical Laboratory, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu, China; School of Medicine, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
³ School of Medicine, Nantong University, Nantong 226001, Jiangsu, China.
⁴ Department of Clinical Laboratory, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu, China.
⁵ Department of Clinical Laboratory, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu, China. Electronic address: zhangyiquanq@163.com.
⁶ Department of Clinical Laboratory, Nantong Third People's Hospital, Affiliated Nantong Hospital 3 of Nantong University, Nantong 226006, Jiangsu, China. Electronic address: rainman78@163.com.

PMID: 40580700
DOI: 10.1016/j.ijfoodmicro.2025.111327

Abstract

Vibrio parahaemolyticus is the leading causative agent of seafood-associated acute gastroenteritis. The formation of biofilms is one of the key reasons for its resistance to adverse environments and its persistence in seafood. Investigating the regulatory mechanisms of biofilm formation is beneficial for the development of new intervention methods to reduce V. parahaemolyticus contamination during seafood processing and storage. In this study, we identified a global regulator, LtrA (VPA0519), which is involved in regulating biofilm formation in V. parahaemolyticus. The deletion of ltrA led to a significant alteration in the transcription levels of 706 genes, including those associated with type III and VI secretion systems and biofilm formation. LtrA positively regulated biofilm formation by enhancing the production of exopolysaccharides, extracellular proteins, extracellular DNA, and cyclic di-GMP (c-di-GMP), as well as by decreasing swimming and swarming motility. The deletion of the ltrA gene also led to a reduction in the metabolic activity of biofilm cells but did not affect the production of capsular polysaccharide. Furthermore, the deletion of the ltrA gene resulted in a decrease in the biofilm formation ability of V. parahaemolyticus on the surfaces of shrimp (Parapenaeopsis hardwickii), crab (Portunus trituberculatus), polypropylene plastic, glass, and stainless steel. The findings in this study extend our understanding of the roles of LtrA and the genetic determinants involved in biofilm formation by V. parahaemolyticus.

Keywords: Biofilm formation; LtrA; Mechanism; Regulation; Transcription; Vibrio parahaemolyticus.