当前位置： SCI文献检索 > BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS期刊下所有文献 > Proadrenomedullin N-terminal 20 peptide (PAMP) and its C-terminal 12-residue peptide, PAMP(9-20): Cell selectivity and antimicrobial mechanism.

Proadrenomedullin N-terminal 20 peptide (PAMP) and its C-terminal 12-residue peptide, PAMP(9-20): Cell selectivity and antimicrobial mechanism.

Abstract：

:Proadrenomedullin N-terminal 20 peptide (PAMP) is a regulatory peptide that is found in various cell types. It is involved in many biological activities and is rich in basic and hydrophobic amino acids, a common feature of antimicrobial peptides (AMPs). In this study, the cell selectivity and antimicrobial mechanism of PAMP and its C-terminal peptide, PAMP(9-20), were investigated. PAMP and PAMP(9-20) displayed potent antimicrobial activity (minimum inhibitory concentration: 4-32 μM) against standard bacterial strains, but showed no hemolytic activity even at the highest tested concentration of 256 μM. PAMP(9-20) showed 2- to 4-fold increase in antimicrobial activity against gram-negative bacteria compared to PAMP. Cytoplasmic membrane depolarization, leakage of calcein dye from membrane mimic liposomes, SYTOX Green uptake, membrane permeabilization, and flow cytometry studies indicated that the major target of PAMP and PAMP(9-20) is not the microbial cell membrane. Interestingly, laser-scanning confocal microscopy demonstrated that FITC-labeled PAMP and PAMP(9-20) enter the cytoplasm of Escherichia coli similar to buforin-2, and gel retardation assay indicated that PAMP and PAMP(9-20) effectively bind to bacterial DNA. These results suggest that the intracellular target mechanism is responsible for the antimicrobial action of PAMP and PAMP(9-20). Collectively, PAMP and PAMP(9-20) could be considered promising candidates for the development of new antimicrobial agents.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Ajish C,Yang S,Kumar SD,Shin SY

doi

10.1016/j.bbrc.2020.04.063

subject

Has Abstract

pub_date

2020-06-30 00:00:00

pages

744-750

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(20)30789-0

journal_volume

527

pub_type

杂志文章

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