4S3G
Structure of the F249X mutant of Phosphatidylinositol-specific phospholipase C from Staphylococcus aureus
Summary for 4S3G
| Entry DOI | 10.2210/pdb4s3g/pdb |
| Related | 4RV3 |
| Descriptor | 1-phosphatidylinositol phosphodiesterase, 1,2,3,4,5,6-HEXAHYDROXY-CYCLOHEXANE, ACETATE ION, ... (4 entities in total) |
| Functional Keywords | tim barrel, cation-pi, phospholipase, lyase |
| Biological source | Staphylococcus aureus str. Newman |
| Cellular location | Secreted: P45723 |
| Total number of polymer chains | 1 |
| Total formula weight | 34500.15 |
| Authors | He, T.,Gershenson, A.,Eyles, S.J.,Gao, J.,Roberts, M.F. (deposition date: 2015-01-26, release date: 2015-07-01, Last modification date: 2024-11-06) |
| Primary citation | He, T.,Gershenson, A.,Eyles, S.J.,Lee, Y.J.,Liu, W.R.,Wang, J.,Gao, J.,Roberts, M.F. Fluorinated Aromatic Amino Acids Distinguish Cation-pi Interactions from Membrane Insertion. J.Biol.Chem., 290:19334-19342, 2015 Cited by PubMed Abstract: Cation-π interactions, where protein aromatic residues supply π systems while a positive-charged portion of phospholipid head groups are the cations, have been suggested as important binding modes for peripheral membrane proteins. However, aromatic amino acids can also insert into membranes and hydrophobically interact with lipid tails. Heretofore there has been no facile way to differentiate these two types of interactions. We show that specific incorporation of fluorinated amino acids into proteins can experimentally distinguish cation-π interactions from membrane insertion of the aromatic side chains. Fluorinated aromatic amino acids destabilize the cation-π interactions by altering electrostatics of the aromatic ring, whereas their increased hydrophobicity enhances membrane insertion. Incorporation of pentafluorophenylalanine or difluorotyrosine into a Staphylococcus aureus phosphatidylinositol-specific phospholipase C variant engineered to contain a specific PC-binding site demonstrates the effectiveness of this methodology. Applying this methodology to the plethora of tyrosine residues in Bacillus thuringiensis phosphatidylinositol-specific phospholipase C definitively identifies those involved in cation-π interactions with phosphatidylcholine. This powerful method can easily be used to determine the roles of aromatic residues in other peripheral membrane proteins and in integral membrane proteins. PubMed: 26092728DOI: 10.1074/jbc.M115.668343 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.5 Å) |
Structure validation
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