Leishmania donovani ADF/cofilin (LdCof) is a novel member of ADF/cofilin family. LdCof depolymeri... more Leishmania donovani ADF/cofilin (LdCof) is a novel member of ADF/cofilin family. LdCof depolymerizes, but does not co-sediment with, rabbit muscle actin filaments. Its F-actin depolymerizing activity is pH independent. Further, it possesses weak F-actin severing activity. In order to better understand its characteristic properties, we have determined the solution NMR structure of LdCof and have analyzed protein backbone dynamics from 15 N-relaxation measurements. The structure of LdCof possesses a conserved ADF/cofilin fold with a central mixed b-sheet consisting of six b-strands which is surrounded by five a-helices. LdCof structure has conserved G/F-actin binding site which includes the characteristic long kinked a-helix (a3). LdCof binds to rabbit muscle ADP-G-actin with 1:1 stoichiometry (K d $ 0.2 lM). The F-actin binding site is not well formed and analysis of 15 N-relaxation data shows that residues in the b4-b5 loop region and C-terminal are relatively flexible, which seems to be a determinant for the low F-actin severing activity of LdCof.
Leishmania donovani ADF/cofilin (LdCof) is a novel member of ADF/cofilin family. LdCof depolymeri... more Leishmania donovani ADF/cofilin (LdCof) is a novel member of ADF/cofilin family. LdCof depolymerizes, but does not co-sediment with, rabbit muscle actin filaments. Its F-actin depolymerizing activity is pH independent. Further, it possesses weak F-actin severing activity. In order to better understand its characteristic properties, we have determined the solution NMR structure of LdCof and have analyzed protein backbone dynamics from 15 N-relaxation measurements. The structure of LdCof possesses a conserved ADF/cofilin fold with a central mixed b-sheet consisting of six b-strands which is surrounded by five a-helices. LdCof structure has conserved G/F-actin binding site which includes the characteristic long kinked a-helix (a3). LdCof binds to rabbit muscle ADP-G-actin with 1:1 stoichiometry (K d $ 0.2 lM). The F-actin binding site is not well formed and analysis of 15 N-relaxation data shows that residues in the b4-b5 loop region and C-terminal are relatively flexible, which seems to be a determinant for the low F-actin severing activity of LdCof.
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