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SUMMARY:Investigating heterogeneous lipid membranes with ultrafast 2D infra
 red spectroscopy
LOCATION:Chemistry A101
TZID:America/Denver
DTSTART:20200116T160000
UID:2026-05-02-23-37-21@natsci.colostate.edu
DTSTAMP:20260502T233721
Description:About the Seminar:\nLipid membranes are much more than barriers
  between cell compartments\, they are integral components of the cell invo
 lved in key functions such as signaling\, transport\, and sensing. Membran
 es are composed of hundreds of different lipid species and contain thousan
 ds of proteins. The biological reason for this heterogeneity is not unders
 tood. We use ultrafast 2D IR spectroscopy to probe the local hydrogen-bond
  dynamics at the interface. Specifically\, we investigate how cations\, at
  physiological concentrations\, alter the lipid-lipid and lipid-water inte
 ractions at the interface. Our results indicate that Ca2+ at low mM concen
 trations slows down the interfacial water dynamics. In the second part of 
 this talk\, I will discuss our current work on utilizing peptides with bac
 kbone isotope labels to probe the degree of water penetration into the bil
 ayer\, as well as using peptides to “crowd” the lipids. Our results sh
 ow that the presence of polar residues in membrane proteins increase the d
 egree of water penetration within the bilayer.\nAbout the Speaker:\nCarlos
  Baiz is a faculty member at the University of Texas at Austin. His lab st
 udies the biophysics of complex systems such as heterogeneous lipid membra
 nes and membrane proteins using ultrafast two-dimensional infrared spectro
 scopy and molecular dynamics simulations. His group also develops vibratio
 nal models\, including frequency maps to connect experiments with simulati
 ons. He has a Ph.D. in Chemistry from the University of Michigan where he 
 worked in the lab of Prof. Kevin Kubarych and postdoctoral training at MIT
  and University of Chicago with Prof. Andrei Tokmakoff.\n&nbsp\; 4:00 pm
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