University of Illinois at Chicago
Chicago IL 60607
Research in the Lorieau group integrates Biophysics, Physical Chemistry, Structural Biology and Biochemistry in elucidating the interplay between biomolecular structure, dynamics, chemistry and function. With a combination of solution- and solid-state Nuclear Magnetic Resonance spectroscopies, computational tools and other biophysical methods, our research focuses on membrane protein structure and dynamics, membrane protein biochemistry, the development of theory and techniques to enhance the precision and resolution of structural and dynamic information by NMR, and the investigation of molecular dynamics as it relates to enzymatic catalysis and kinetics.
- Membrane protein and membrane channel structure, dynamics and function
- Methods for the high-resolution characterization of structure and dynamics for solution-state and solid-state nuclear magnetic resonace of large molecular-weight biomolecules
- Software development for the simulation of magnetic resonance, including data and statistical analysis of multidimensional datasets
Recent Publications and Group News
Publication: Hybrid NMR: A Union of Solution- and Solid-State NMR
Hybrid NMR (hdNMR) is a powerful new tool that combines the strengths of solution- and solid-state NMR to measure dipolar, chemical shift, and quadrupolar tensors in aqueous solution. We introduce the theory of hdNMR and partially randomly oriented (PRO) crystalline hydrogel samples. PRO samples produce randomly oriented spectra with characteristic Pake patterns from the solid state, yet they maintain the high-resolution dispersion of solution NMR experiments. With new pulse sequences, we show how hdNMR can be used to measure with high precision the 1Hα–13Cα dipolar tensor and carboxylate chemical shift anisotropy tensor of aspartate. These measurements contain detailed information on the distribution of electron density, interatomic distances, and the orientation dependence of molecular motion.
News: NSF CAREER Awarded to the Lorieau Group
The Lorieau group received the CAREER award from the National Science Foundation (NSF) for the project titled, “CAREER: Mechanism of Protein Catalyzed Membrane Fusion.” This project investigates the molecular mechanism of viral infection in the influenza virus and other related viral systems. News coverage on the grant can be found here. (Photo: UIC/Jenny Fontaine)
Publication: Membrane Fusion and Infection of the Influenza Hemagglutinin (Chapter)
The influenza virus is a major health concern associated with an estimated 5000 to 30,000 deaths every year (Reed et al. 2015) and a significant economic impact with the development of treatments, vaccinations and research (Molinari et al. 2007). The entirety of the influenza genome is comprised of only eleven coding genes. An enormous degree of variation in non-conserved regions leads to significant challenges in the development of inclusive inhibitors for treatment. The fusion peptide domain of the influenza A hemagglutinin (HA) is a promising candidate for treatment since it is one of the most highly conserved sequences in the influenza genome (Heiny et al. 2007), and it is vital to the viral life cycle. Hemagglutinin is a class I viral fusion protein that catalyzes the membrane fusion process during cellular entry and infection. Impediment of the hemagglutinin’s function, either through incomplete post-translational processing (Klenk et al. 1975; Lazarowitz and Choppin 1975) or through mutations (Cross et al. 2001), leads to non-infective virus particles. This review will investigate current research on the role of hemagglutinin in the virus life cycle, its structural biology and mechanism as well as the central role of the hemagglutinin fusion peptide (HAfp) to influenza membrane fusion and infection.
News: The Lorieau Group (2016)
Group photo of the Lorieau Group. Members, from left to right, are ustin L Lorieau, Adrian W Draney, Alec Malooney, Charles D DeLisle, Indrani Banerjee, Ed Gluzman, Bhagya Mendis and Sean T Smrt.
News: Chemistry Demo Day
Chemistry demo day with Adrian W Draney, Charles Delisle and Sean T Smrt.
Publication: A Positively Charged Liquid Crystalline Medium for Measuring Residual Dipolar Couplings in Membrane Proteins by NMR
Residual Dipolar Couplings (RDCs) are integral to the refinement of membrane protein structures by NMR since they accurately define the orientation of helices and other structural units. Only a small set of liquid crystals used for RDC measurements are compatible with the detergents needed in membrane protein studies. The available detergent-compatible liquid crystals are negatively charged, thus offering effectively only one of five orthogonal components of the alignment Saupe matrix. In this communication, we present a robust liquid crystalline medium that is positively charged, pinacyanol acetate (PNA), for the determination of orthogonal sets of RDCs in membrane proteins. This new medium promises to enhance the accuracy of membrane protein structures and the measurement of dynamics based on RDCs.Residual Dipolar Couplings (RDCs) are integral to the refinement of membrane protein structures by NMR since they accurately define the orientation of helices and other structural units. Only a small set of liquid crystals used for RDC measurements are compatible with the detergents needed in membrane protein studies.The available detergent-compatible liquid crystals are negatively charged, thus offering effectively only one of five orthogonal components of the alignment Saupe matrix. In this communication, we present a robust liquid crystalline medium that is positively charged, pinacyanol acetate (PNA), for the determination of orthogonal sets of RDCs in membrane proteins. This new medium promises to enhance the accuracy of membrane protein structures and the measurement of dynamics based on RDCs.