Abstract:
:The shock-induced serine protease HtrA1 is a potential regulator of human placenta development during pregnancy. The protein contains a functional PDZ domain that has been solved in complex with a phage display-derived heptapeptide: Asp-6 Ser-5 Arg-4 Ile-3 Trp-2 Trp-1 Val0 . In this study, a rationally designed halogen bond was introduced to the domain-peptide complex based on its NMR structure in solution. We computationally compared the stabilization energies and hindrance effects due to the presence of different halogens X (X = F, Cl, Br, or I), using a hybrid quantum mechanics/molecular mechanics (QM/MM) approach, and found that the Br atom could considerably promote the peptide binding free energy (ΔΔG = -5.2 kcal/mol). Fluorescence assays confirmed that the peptide affinity to the HtrA1 PDZ domain was improved by approximately sevenfold upon bromination. Structural analysis identified a geometrically perfect halogen bond between the Br atom of the peptide Trp-1 residue and the carbonyl O atom of the HtrA1 Ile385 residue, with a bond length and an interaction energy of d = 3.20 Å and ΔE = -3.7 kcal/mol, respectively.
journal_name
Arch Pharm (Weinheim)journal_title
Archiv der Pharmazieauthors
Dou SF,Liu H,Cao TM,Wen QL,Li J,Shao QCdoi
10.1002/ardp.201500466subject
Has Abstractpub_date
2016-04-01 00:00:00pages
302-7issue
4eissn
0365-6233issn
1521-4184journal_volume
349pub_type
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