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Requirement of ßDELSEED-Motif of <em>Escherichia coli</em> F<sub>1</sub>F<sub>O</sub> ATP Synthase in Antimicrobial Peptide Binding.

F1FO ATP synthase is a membrane bound enzyme capable of synthesizing and hydrolyzing ATP. Lately, α-helical cationic peptides such as melittin and melittin related peptide (MRP) were shown to inhibit E. coli ATP synthase. The proposed but unconfirmed site of inhibition is βDELSEED-motif formed by the residues 380-386, located at the interface of α/β subunit of ATP synthase. This project was a mutagenic analysis of βDELSEED-motif residues to understand the binding mechanism and mode of action of peptide inhibitors. The study addressed 2 main questions: Are the antibacterial/anticancer effects of these peptides related to their inhibitory action on ATP synthase through interaction with the βDELSEED-motif? If so, which amino acid residues play critical role in peptide binding?
The findings demonstrated that the βDELSEED-motif is the binding site of the above peptides on ATP synthase and Glutamate residues are more important in peptide binding than the Aspartate residues.

Identiferoai:union.ndltd.org:ETSU/oai:dc.etsu.edu:etd-2451
Date01 May 2011
CreatorsTayou, Junior Kom
PublisherDigital Commons @ East Tennessee State University
Source SetsEast Tennessee State University
Detected LanguageEnglish
Typetext
Formatapplication/pdf
SourceElectronic Theses and Dissertations
RightsCopyright by the authors.

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