3B7A

Complex of S52A Substituted Droposphila LUSH protein with Ethanol

Summary for 3B7A

• Entry DOI: 10.2210/pdb3b7a/pdb
• Related: 1OOF 1OOG 1OOH 1OOI 1t14 3B6X
• Descriptor: General odorant-binding protein lush, ETHANOL, ACETATE ION, ... (4 entities in total)
• Functional Keywords: odorant binding protein, alochol binding protein, behavior, olfaction, pheromone response, pheromone-binding, secreted, sensory transduction, transport, transport protein
• Biological source: Drosophila melanogaster (fruit fly)
• Cellular location: Secreted: O02372
• Total number of polymer chains: 2
• Total formula weight: 28740.30

Authors

Jones, D.N.M.,Thode, A.B. (deposition date: 2007-10-30, release date: 2008-02-05, Last modification date: 2024-11-13)

Primary citation

Thode, A.B.,Kruse, S.W.,Nix, J.C.,Jones, D.N.
The role of multiple hydrogen-bonding groups in specific alcohol binding sites in proteins: insights from structural studies of LUSH.
J.Mol.Biol., 376:1360-1376, 2008

PubMed Abstract: It is now generally accepted that many of the physiological effects of alcohol consumption are a direct result of binding to specific sites in neuronal proteins such as ion channels or other components of neuronal signaling cascades. Binding to these targets generally occurs in water-filled pockets and leads to alterations in protein structure and dynamics. However, the precise interactions required to confer alcohol sensitivity to a particular protein remain undefined. Using information from the previously solved crystal structures of the Drosophila melanogaster protein LUSH in complexes with short-chain alcohols, we have designed and tested the effects of specific amino acid substitutions on alcohol binding. The effects of these substitutions, specifically S52A, T57S, and T57A, were examined using a combination of molecular dynamics, X-ray crystallography, fluorescence spectroscopy, and thermal unfolding. These studies reveal that the binding of ethanol is highly sensitive to small changes in the composition of the alcohol binding site. We find that T57 is the most critical residue for binding alcohols; the T57A substitution completely abolishes binding, while the T57S substitution differentially affects ethanol binding compared to longer-chain alcohols. The additional requirement for a potential hydrogen-bond acceptor at position 52 suggests that both the presence of multiple hydrogen-bonding groups and the identity of the hydrogen-bonding residues are critical for defining an ethanol binding site. These results provide new insights into the detailed chemistry of alcohol's interactions with proteins.

PubMed: 18234222
DOI: 10.1016/j.jmb.2007.12.063

Experimental method

X-RAY DIFFRACTION (1.9 Å)