1ohm
Sakacin P variant that is structurally stabilized by an inserted C-terminal disulfide bridge.
Structural highlights
FunctionSAKP_LATSK Bactericidal activity; inhibits closely related Lactobacilli, Listeria monocytogenes and ivanovvi, Enterococcus faecalis, Carnobacterium sp and Brocothrix thermosphacta. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe three-dimensional structures in dodecylphosphocholine (DPC) micelles and in trifluoroethanol (TFE) of the pediocin-like antimicrobial peptide sakacin P and an engineered variant of sakacin P (termed sakP[N24C+44C]) have been determined by use of nuclear magnetic resonance spectroscopy. SakP[N24C+44C] has an inserted non-native activity- and structure-stabilizing C-terminal disulfide bridge that ties the C-terminus to the middle part of the peptide. In the presence of DPC, the cationic N-terminal region (residues 1-17) of both peptides has an S-shaped conformation that is reminiscent of a three-stranded antiparallel beta-sheet and that is more pronounced when the peptide was dissolved in TFE instead of DPC. The four positively charged residues located in the N-terminal part are found pointing to the same direction. For both peptides, the N-terminal region is followed by a well-defined central amphiphilic alpha-helix (residues 18-33), and this in turn is followed by the C-terminal tail (residues 34-43 for sakacin P and 34-44 for sakP[N24C+44C]) that lacks any apparent common secondary structural motif. In the presence of DPC, the C-terminal tails in both peptides fold back onto the central alpha-helix, thereby creating a hairpin-like structure in the C-terminal halves. The lack of long-range NOEs between the beta-sheet Nu-terminal region and the hairpin-like C-terminal half indicates that there is a flexible hinge between these regions. We discuss which implications such a structural arrangement has on the interaction with the target cell membrane. Three-dimensional structure in lipid micelles of the pediocin-like antimicrobial peptide sakacin P and a sakacin P variant that is structurally stabilized by an inserted C-terminal disulfide bridge.,Uteng M, Hauge HH, Markwick PR, Fimland G, Mantzilas D, Nissen-Meyer J, Muhle-Goll C Biochemistry. 2003 Oct 7;42(39):11417-26. PMID:14516192[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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