Crystal Structure of a Soluble Fragment of the Membrane Fusion Protein HlyD in a Type I Secretion System of Gram-Negative Bacteriaopen access
- Authors
- Kim, Jin-Sik; Song, Saemee; Lee, Minho; Lee, Seunghwa; Lee, Kangseok; Ha, Nam-Chul
- Issue Date
- Mar-2016
- Publisher
- CELL PRESS
- Citation
- STRUCTURE, v.24, no.3, pp 477 - 485
- Pages
- 9
- Journal Title
- STRUCTURE
- Volume
- 24
- Number
- 3
- Start Page
- 477
- End Page
- 485
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/7178
- DOI
- 10.1016/j.str.2015.12.012
- ISSN
- 0969-2126
1878-4186
- Abstract
- The protein toxin HlyA of Escherichia coli is exported without a periplasmic intermediate by the type I secretion system (T1SS). The T1SS is composed of an inner membrane ABC transporter HlyB, an outermembrane channel protein TolC, and a membrane fusion protein HlyD. However, the assembly of the T1SS remains to be elucidated. In this study, we determine the crystal structure of a part of the C-terminal periplasmic domain of HlyD. The long alpha-helical domain consisting of three alpha helices and a lipoyl domain was identified in the crystal structure. Based on the HlyD structure, we modeled the hexameric assembly of HlyD with a long alpha-helical barrel, which formed a complex with TolC in an intermeshing cogwheel-to-cogwheel manner, as observed in tripartite RND-type drug efflux pumps. These observations provide a structural blueprint for understanding the type I secretion system in pathogenic Gram-negative bacteria.
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Collections - College of Natural Sciences > Department of Life Science > 1. Journal Articles
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