Other studies have shown the ability of spermine-based polymers to neutralize the negative charge of nucleic acids to yield an overall neutralized to slightly positive charge suitable for interaction with the negatively charged cell membrane.
Strains of bacteria where the LPS is highly substituted with 4-amino-4-deoxy-L-arabinose or is highly acylated show greater resistance to positively charged antimicrobial peptides, lending further credibility to the theory that electrostatic charge is important for interaction with the target cell membrane [ 28].
This concentration of positive charges is primed for interaction with a negatively charged group such as phosphate.
HEWL was chosen for use since it crystallizes under a wide range of conditions and especially due to its highly positive charge making it ideal for interaction with negatively charged POMs.
Many studies of the Fe S proteins showed that although these proteins usually have conserved charged residues (such as positive charges in ferredoxins), these charges are mainly important for interaction with the redox partner, and usually their mutations do not cause significant changes in the reduction potential.
It is possible that charge is also important for interaction of the OB-fold with the Trt1 complex, and alteration of this charge, for example through the K75A mutation, could reduce telomerase activity.
This indicates that the strongest charge transfer is responsible for interaction between N2O gas and nanotube in this model.
For MiaB, the mainly positively charged TRAM domain is poised to attract negatively charged tRNA substrates, whereas in RimO, the negatively charged TRAM domain makes it possible for interaction with the positively charged S12 protein.
Although AMPs vary widely in length, structure, and source, they have some important common traits, such as positive charges, presumed to be important for interaction with the negatively charged surface of pathogens, and amphipathicity, which enables better combine with the hydrophilic surface and interact with the hydrophobic part of the microbial membrane (Silva et al. 2014).
A triple mutant R146E/R153E/K156E effectively reverses the surface charge of a large part of the helix, making it unfavourable for interaction with negatively charged membranes.
