TY  - JOUR
A1  - Lehner, Florian
A1  - Kudlinzki, Denis
A1  - Richter, Christian
A1  - Müller-Werkmeister, Henrike
A1  - Eberl, Katharina Barbara
A1  - Bredenbeck, Jens
A1  - Schwalbe, Harald
A1  - Silvers, Robert
T1  - Impact of azidohomoalanine incorporation on protein structure and ligand binding
T2  - Postprint, zuerst in: ChemBioChem
N2  - The impact of the incorporation of a non-natural amino acid (NNAA) on protein structure, dynamics, and ligand binding has not been studied rigorously so far. NNAAs are regularly used to modify proteins post-translationally in vivo and in vitro through click chemistry. Herein, structural characterisation of the impact of the incorporation of azidohomoalanine (AZH) into the model protein domain PDZ3 is examined by means of NMR spectroscopy and X-ray crystallography. The structure and dynamics of the apo state of AZH-modified PDZ3 remain mostly unperturbed. Furthermore, the binding of two PDZ3 binding peptides are unchanged upon incorporation of AZH. The interface of the AZH-modified PDZ3 and an azulene-linked peptide for vibrational energy transfer studies has been mapped by means of chemical shift perturbations and NOEs between the unlabelled azulene-linked peptide and the isotopically labelled protein. Co-crystallisation and soaking failed for the peptide-bound holo complex. NMR spectroscopy, however, allowed determination of the protein-ligand interface. Although the incorporation of AZH was minimally invasive for PDZ3, structural analysis of NNAA-modified proteins through the methodology presented herein should be performed to ensure structural integrity of the studied target.
KW  - NMR spectroscopy
KW  - X-ray diffraction
KW  - amino acids
KW  - proteins
KW  - structure elucidation
Y1  - 2017
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/51315
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-513151
N1  - Postprint, zuerst in: ChemBioChem 18.2017, 23, S. 2340-2350, doi: 10.1002/cbic.201700437
Gefördert durch: European Union: Horizon 2020. Infrastructure for NMR, EM and X-rays for Translational Research, iNEXT, H2020 Grant # 653706
VL  - 18
IS  - 23
SP  - 2340
EP  - 2350
ER  -