Probing backbone hydrogen bonding in PDZ/ligand interactions by protein amide-to-ester mutations
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Probing backbone hydrogen bonding in PDZ/ligand interactions by protein amide-to-ester mutations. / Pedersen, Søren W; Pedersen, Stine B; Anker, Louise; Hultqvist, Greta; Kristensen, Anders S; Jemth, Per; Strømgaard, Kristian.
In: Nature Communications, Vol. 5, 3215, 2014, p. 1-11.Research output: Contribution to journal › Journal article › Research › peer-review
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T1 - Probing backbone hydrogen bonding in PDZ/ligand interactions by protein amide-to-ester mutations
AU - Pedersen, Søren W
AU - Pedersen, Stine B
AU - Anker, Louise
AU - Hultqvist, Greta
AU - Kristensen, Anders S
AU - Jemth, Per
AU - Strømgaard, Kristian
PY - 2014
Y1 - 2014
N2 - PDZ domains are scaffolding modules in protein-protein interactions that mediate numerous physiological functions by interacting canonically with the C-terminus or non-canonically with an internal motif of protein ligands. A conserved carboxylate-binding site in the PDZ domain facilitates binding via backbone hydrogen bonds; however, little is known about the role of these hydrogen bonds due to experimental challenges with backbone mutations. Here we address this interaction by generating semisynthetic PDZ domains containing backbone amide-to-ester mutations and evaluating the importance of individual hydrogen bonds for ligand binding. We observe substantial and differential effects upon amide-to-ester mutation in PDZ2 of postsynaptic density protein 95 and other PDZ domains, suggesting that hydrogen bonding at the carboxylate-binding site contributes to both affinity and selectivity. In particular, the hydrogen-bonding pattern is surprisingly different between the non-canonical and canonical interaction. Our data provide a detailed understanding of the role of hydrogen bonds in protein-protein interactions.
AB - PDZ domains are scaffolding modules in protein-protein interactions that mediate numerous physiological functions by interacting canonically with the C-terminus or non-canonically with an internal motif of protein ligands. A conserved carboxylate-binding site in the PDZ domain facilitates binding via backbone hydrogen bonds; however, little is known about the role of these hydrogen bonds due to experimental challenges with backbone mutations. Here we address this interaction by generating semisynthetic PDZ domains containing backbone amide-to-ester mutations and evaluating the importance of individual hydrogen bonds for ligand binding. We observe substantial and differential effects upon amide-to-ester mutation in PDZ2 of postsynaptic density protein 95 and other PDZ domains, suggesting that hydrogen bonding at the carboxylate-binding site contributes to both affinity and selectivity. In particular, the hydrogen-bonding pattern is surprisingly different between the non-canonical and canonical interaction. Our data provide a detailed understanding of the role of hydrogen bonds in protein-protein interactions.
U2 - 10.1038/ncomms4215
DO - 10.1038/ncomms4215
M3 - Journal article
C2 - 24477114
VL - 5
SP - 1
EP - 11
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 3215
ER -
ID: 108650774