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Author Sun, Yazhou ♦ Maternal, Nanjing ♦ Zhou, Yahui ♦ Liu, Xiao ♦ Zhang, Fan ♦ Yan, Linping ♦ Chen, Ling ♦ Wang, Xing ♦ Ruan, Hongjie ♦ Ji, Chenbo ♦ Cui, Xianwei ♦ Wang, Jiaqin
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword APPLIED LIFE SCIENCES ♦ ABSORPTION SPECTROSCOPY ♦ CELL WALL ♦ ELECTRON MICROSCOPY ♦ MILK ♦ PEPTIDES
Abstract Human milk has always been considered an ideal source of elemental nutrients to both preterm and full term infants in order to optimally develop the infant's tissues and organs. Recently, hundreds of endogenous milk peptides were identified in human milk. These peptides exhibited angiotensin-converting enzyme inhibition, immunomodulation, or antimicrobial activity. Here, we report the antimicrobial activity and mechanism of a novel type of human antimicrobial peptide (AMP), termed PDC213 (peptide derived from β-Casein 213-226 aa). PDC213 is an endogenous peptide and is present at higher levels in preterm milk than in full term milk. The inhibitory concentration curve and disk diffusion tests showed that PDC213 had obvious antimicrobial against S. aureus and Y. enterocolitica, the common nosocomial pathogens in neonatal intensive care units (NICUs). Fluorescent dye methods, electron microscopy experiments and DNA-binding activity assays further indicated that PDC213 can permeabilize bacterial membranes and cell walls rather than bind intracellular DNA to kill bacteria. Together, our results suggest that PDC213 is a novel type of AMP that warrants further investigation. - Highlights: • PDC213 is an endogenous peptide presenting higher levels in preterm milk. • PDC213 showed obvious antimicrobial against S. aereus and Y. enterocolitica. • PDC213 can permeabilize bacterial membranes and cell walls to kill bacterias. • PDC213 is a novel type of antimicrobial peptides worthy further investigation.
ISSN 0006291X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-02-26
Publisher Place United States
Journal Biochemical and Biophysical Research Communications
Volume Number 484
Issue Number 1


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