Sandbox Reserved 1099: Difference between revisions
From Proteopedia
Jump to navigationJump to search
No edit summary |
No edit summary |
||
| Line 29: | Line 29: | ||
* Assembly of three monomers : | * Assembly of three monomers : | ||
The '''trimer''' is formed by '''<scene name='82/829352/Salt_bridges/1'>salt bridges</scene>''' between 3 subunits. These bonds based on the zipper structure are managed again by the negatively and positively charged residues so hydrophilic residues. Polar amino acids can be localized in the bond area too. In total, 96 residues are ionizable and which are all facing toward the interior of the tunnel. They are creating a channel overall charge of -12 because DCD-1L peptide is -2. However, the amino acids pointing toward the exterior are hydrophobic because they are able to interact with the acyl chain of the membrane. | The '''trimer''' is formed by '''<scene name='82/829352/Salt_bridges/1'>salt bridges</scene>''' between 3 subunits. These bonds based on the zipper structure are managed again by the negatively and positively charged residues so hydrophilic residues. Polar amino acids can be localized in the bond area too. In total, 96 residues are ionizable and which are all facing toward the interior of the tunnel. They are creating a channel overall charge of -12 because DCD-1L peptide is -2. However, the amino acids pointing toward the exterior are hydrophobic because they are able to interact with the acyl chain of the membrane. The conformation of the charged residues formed <scene name='82/829352/Girdles/1'>five girdles</scene> as I,II,III,II,I ; as they are alterning negative (in blue) and positive (in red) global charge.<ref>Song, C. et al. : Crystal Structure and Functional Mechanism of a Human Antimicrobial Membrane Channel. PNAS. 2013 [[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3607029/#!po=50.0000]]</ref>They play a role in the cell membrane insertion. | ||
The bonds between monomers allow the formation of 6 lateral openings of a diameter of 1 nm. And the presence of small (such as polar amino acids) and positive residues may have an impact on the selection of ion entry. | The bonds between monomers allow the formation of 6 lateral openings of a diameter of 1 nm. And the presence of small (such as polar amino acids) and positive residues may have an impact on the selection of ion entry. | ||