 Download MendeleyCrystallization of Enantiomerically Pure Proteins from Quasi-Racemic Mixtures: Structure Determination by X-Ray Diffraction of Isotope-Labeled Ester Insulin and Human Insulin.
Mandal, K., Dhayalan, B., Avital-Shmilovici, M., Tokmakoff, A., Kent, S.B.(2016) Chembiochem 17: 421-425
- PubMed: 26707939 
- DOI: https://doi.org/10.1002/cbic.201500600
- Primary Citation of Related Structures:  
5EN9, 5ENA - PubMed Abstract: 
As a part of a program aimed towards the study of the dynamics of human insulin-protein dimer formation using two-dimensional infrared spectroscopy, we used total chemical synthesis to prepare stable isotope labeled [(1-(13) C=(18) O)Phe(B24) )] human insulin, via [(1-(13) C=(18) O)Phe(B24) )] ester insulin as a key intermediate product that facilitates folding of the synthetic protein molecule (see preceding article). Here, we describe the crystal structure of the synthetic isotope-labeled ester insulin intermediate and the product synthetic human insulin. Additionally, we present our observations on hexamer formation with these two proteins in the absence of phenol derivatives and/or Zn metal ions. We also describe and discuss the fractional crystallization of quasi-racemic protein mixtures containing each of these two synthetic proteins.
Organizational Affiliation: 
Department of Chemistry, University of Chicago, 929 East 57th Street, Chicago, IL, 60637, USA. [email protected].
