The role of lipid composition on the interaction between a tryptophan-rich protein and model bacterial membranes


Autoria(s): Sanders, Michael R.; Clifton, Luke A.; Frazier, Richard A.; Green, R. J.
Data(s)

27/01/2016

Resumo

The interaction between tryptophan-rich puroindoline proteins and model bacterial membranes at the air-liquid interface has been investigated by FTIR spectroscopy, surface pressure measurements and Brewster angle microscopy. The role of different lipid constituents on the interactions between lipid membrane and protein was studied using wild type (Pin-b) and mutant (Trp44 to Arg44 mutant, Pin-bs) puroindoline proteins. The results show differences in the lipid selectivity of the two proteins in terms of preferential binding to specific lipid head groups in mixed lipid systems. Pin-b wild type was able to penetrate mixed layers of phosphatidylethanolamine (PE) and phosphatidylglycerol (PG) head groups more deeply compared to the mutant Pin-bs. Increasing saturation of the lipid tails increased penetration and adsorption of Pin-b wild type, but again the response of the mutant form differed. The results provide insight as to the role of membrane architecture, lipid composition and fluidity, on antimicrobial activity of proteins. Data show distinct differences in the lipid binding behavior of Pin-b as a result of a single residue mutation, highlighting the importance of hydrophobic and charged amino acids in antimicrobial protein and peptide activity.

Formato

text

Identificador

http://centaur.reading.ac.uk/52906/3/Sanders%20et%20al.%20Languir%20final%20260116.pdf

Sanders, M. R., Clifton, L. A., Frazier, R. A. <http://centaur.reading.ac.uk/view/creators/90000815.html> and Green, R. J. <http://centaur.reading.ac.uk/view/creators/90000853.html> (2016) The role of lipid composition on the interaction between a tryptophan-rich protein and model bacterial membranes. Langmuir, 38 (8). pp. 2050-2057. ISSN 0743-7463 doi: 10.1021/acs.langmuir.5b04628 <http://dx.doi.org/10.1021/acs.langmuir.5b04628>

Idioma(s)

en

Publicador

American Chemical Society

Relação

http://centaur.reading.ac.uk/52906/

creatorInternal Frazier, Richard A.

creatorInternal Green, R. J.

10.1021/acs.langmuir.5b04628

Tipo

Article

PeerReviewed