期刊
STRUCTURE
卷 25, 期 1, 页码 203-211出版社
CELL PRESS
DOI: 10.1016/j.str.2016.10.010
关键词
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资金
- SSGCID, Seattle, USA
- NIH/NIAID [HHSN272200700057C, HHSN272201200025C]
- ERC AdG FICModFun [340330]
- SNF [310030B-149886, 31003A_138414]
- European Research Council (ERC) [340330] Funding Source: European Research Council (ERC)
- Swiss National Science Foundation (SNF) [31003A_138414] Funding Source: Swiss National Science Foundation (SNF)
The BID (Bep intracellular delivery) domain functions as secretion signal in a subfamily of protein substrates of bacterial type IV secretion (T4S) systems. It mediates transfer of (1) relaxases and the attached DNA during bacterial conjugation, and (2) numerous Bartonella effector proteins (Beps) during protein transfer into host cells infected by pathogenic Bartonella species. Furthermore, BID domains of Beps have often evolved secondary effector functions within host cells. Here, we provide crystal structures for three representative BID domains and describe a novel conserved fold characterized by a compact, antiparallel four-helix bundle topped with a hook. The conserved hydrophobic core provides a rigid scaffold to a surface that, despite a few conserved exposed residues and similarities in charge distribution, displays significant variability. We propose that the genuine function of BID domains as T4S signal may primarily depend on their rigid structure, while the plasticity of their surface may facilitate adaptation to secondary effector functions.
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