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Vibrio vulnificus Secretes an Insulin-degrading Enzyme That Promotes Bacterial Proliferation in Vivo

Authors
Kim, In HwangKim, Ik-JungWen, YanchengPark, Na-YoungPark, JinyoungLee, Keun-WooKoh, AraLee, Ji-HyunKoo, Seung-HoiKim, Kun-Soo
Issue Date
24-7월-2015
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Citation
JOURNAL OF BIOLOGICAL CHEMISTRY, v.290, no.30, pp.18708 - 18720
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume
290
Number
30
Start Page
18708
End Page
18720
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/92989
DOI
10.1074/jbc.M115.656306
ISSN
0021-9258
Abstract
We describe a novel insulin-degrading enzyme, SidC, that contributes to the proliferation of the human bacterial pathogen Vibrio vulnificus in a mouse model. SidC is phylogenetically distinct from other known insulin-degrading enzymes and is expressed and secreted specifically during host infection. Purified SidC causes a significant decrease in serum insulin levels and an increase in blood glucose levels in mice. A comparison of mice infected with wild type V. vulnificus or an isogenic sidC-deletion strain showed that wild type bacteria proliferated to higher levels. Additionally, hyperglycemia leads to increased proliferation of V. vulnificus in diabetic mice. Consistent with these observations, the sid operon was up-regulated in response to low glucose levels through binding of the cAMP-receptor protein (CRP) complex to a region upstream of the operon. We conclude that glucose levels are important for the survival of V. vulnificus in the host, and that this pathogen uses SidC to actively manipulate host endocrine signals, making the host environment more favorable for bacterial survival and growth.
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Koo, Seung Hoi
생명과학대학 (생명과학부)
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