John B. Vincent

John B. Vincent



  • NIH Postdoctoral Fellow, University of Virginia, 1990-1991
  • Postdoctoral Research Associate, University of Virginia, 1988-1990
  • PhD, Indiana University, 1988
  • BS, Murray State University, 1984


Elucidation of the structure, function, and mode of action of metallobiomolecules.The elucidation of the structure, function, and mode of action of metallobiomolecules via: 1) spectroscopic, magnetic, kinetic and biochemical studies of the natural systems and 2) the synthesis and characterization of biomimetic inorganic complexes.

Our research applies biochemical and synthetic and physical inorganic methods to characterize the function and properties of metallobiomolecules (naturally occurring molecules such as proteins, sugars, etc. that contain tightly bound metal ions). The presence of the metal ions gives these species unique magnetic and spectroscopic properties (such as color) that provide avenues (not available to the study of simple proteins, etc.) by which we can examine these compounds in detail. Techniques involved include a variety of chromatographic methods; gel electrophoresis; mass spectrometry; electronic, Raman, electron spin resonance, IR, UV-visible, X-ray absorbance and nuclear magnetic resonance spectroscopies; and an assortment of synthetic methods.

Currently our efforts are focussed on the elucidation of the role of chromium in diabetes and the maintenance of proper carbohydrate and lipid metabolism and on the use of metalloprotein affinity metal chromatography.

We have recently shown that the oligopeptide chromodulin (or also known as low-molecular-weight chromium-binding substance, LMWCr) binds to insulin receptor in response to insulin; this results in an increase of the ability of insulin to signal cells that blood glucose concentrations are high. This may be related to adult-onset diabetes (90% of all diabetes cases in the United States), where body tissues become insensitive to insulin. We have also developed a synthetic biomimetic for chromodulin; this comple, called Cr3, has been shown to lower total blood cholesterol levels in rats by 30% and LDL cholesterol by 40%, and may have potential in the treatment of the symptoms of adult-onset diabetes.

At present, it is extremely difficult to selectively remove metal ions from dilute aqueous solutions of mixed metal ions. Metalloprotein affinity metal chromatography uses Nature’s own tricks for accomplishing this process to selectively remove and recover metal ions from waste streams. Current efforts are focussed on the removal of actinide ions (uranium, plutonium, etc.) using the metal transport protein transferrin covalently attached to chromatography supports.

Selected Publications

Over Thirty Years of REU Programs in the Department of Chemistry and Biochemistry at The University of Alabama. John B. Vincent and Stephen A. Woski, Best Practices for REU Programs, Mark Griep and Linette Watkins, Eds., ACS Symposium Series 1295, American Chemical Society, Washington, D. C., 2018, 17-31.

Chromium. John B. Vincent and Henry C. Lukaski. Adv. Nutr. 2018, 9, 505-506.

New Evidence against Chromium as an Essential Trace Element. John B. Vincent. J. Nutr. 2017, 147, 2212-2219.

The Effects of the Glycation of Transferrin on Chromium Binding and the Transport and Distribution of Chromium In Vivo. Ge Deng, Samantha L. Dyroff, Molly Lockart, Michael K. Bowman, and John B. Vincent, J. Inorg. Biochem. 2016, 164, 26-33.

The Potential of Cr3 [triaqua-m3-oxo-hexa-m-propionatotrichromium(III) chloride] to Reduce Birth Defects in the Offspring of Diabetic CD-1 Mice.  Johnathan D. Keith, Christina Vincent, Michael Goetsch, Amie Lemley, Riley Kraus, Austin Broussard, Ashley Kildow, Josh Faught, John B. Vincent, and Jane F. Rasco, Birth Defects Res. Part B: Developmental Reprod. Toxicol. 2015, 204, 65-70.

Trivalent Chromium Has No Effect on Delaying Azoxymethane-induced Colorectal Cancer in FVB/NJ Mice. Pandora E. White, Ge Deng, M. Kaitlyn Kuyendall, Abbey M. Tadros, Samantha L. Dyroff, Rachel E. Honan, Preshus M. Robertson, John B. Vincent, and Jane F. Rasco. Biol. Trace Elem. Res. 2015, 168, 221-226.

Spectroscopic and Biological Activity Studies of the Chromium-Binding Peptide EEEEGDD. Hirohumi Arakawa, Machender R. Kandadi, Evgenity Panzhinskiy, Kenneth Belmore, Ebony Love, Preshus M. Robertson, Juliette J. Commodore, Carolyn J. Cassady, Sreejayan Nair, and John B. Vincent, J. Biol. Inorg. Chem. 2016, 21, 369-381.

Binding of Trivalent Chromium to Serum Transferrin Is Sufficiently Rapid to be Physiologically Relevant. Ge Deng, Kristi Wu, Alex Cruce, Michael W. Bowman, and John B. Vincent. J. Inorg. Biochem. 2015, 143, 48-55.

Is Chromium Pharmacologically Relevant? John B. Vincent. J. Trace Elem. Med. Biol. 2014, 28, 397-405.

The Bioinorganic Chemistry of Chromium. John B. Vincent.  John Wiley & Sons, Ltd., Chichester, UK, 2013.

Urinary Chromium Excretion in Response to an Insulin Challenge Is Not a Biomarker for Chromium Status.  Sharifa T. Love, Kristin R. Di Bona, Sarmistha Halder Sinha, DeAna McAdory, Brittany R. Skinner, Jane F. Rasco, and John B. Vincent, Biol. Trace Elem. Res. 2013, 152, 57-65.

Comparison of Tissue Metal Concentration in Zucker Lean, Zucker Obese, and Zucker Diabetic Fatty Rats and the Effect of Chromium Supplementation on Tissue Metal Concentrations. Halina Stanick, Nicholas R. Rhodes, Kristin R. Di Bona, Ge Deng, Sharifa Love, Leigh Ann Pledger, Jeremy Blount, Emmalea Gomberg, Frances Grappe, Chelsea Cernosek, Brittany Peoples, Jane F. Rasco, Zbigniew Krejpcio, and John B. Vincent, Biol. Trace Elem. Res. 2012, 151, 373-383.

Monocarboxylate Transporters Are Not Responsible for Cr3+ Transport from Endosomes. Nicholas R. Rhodes, Paul A. LeBlanc, Jane F. Rasco, and John B. Vincent, Biol. Trace Elem. Res. 2012, 148, 409-414.

Long-term Exposure to [Cr3O(O2CCH2CH3)6(H2O)3]+ in Wistar Rats Fed Normal or High-fat Diets Does Not Alter Glucose Metabolism. Betty J. Herring, Amanda L. Logsdon, Jarrett E. Lockard, Brittany M. Miller, Hanna Kim, Eric A. Calderon, John B. Vincent, and Melissa M. Bailey, Biol. Trace Elem. Res. 2012, 151, 406-414.

Chromium Is Not an Essential Trace Element for Mammals: Effects of a “Low-chromium” Diet.  Kristin R. Di Bona, Sharifa Love, Nicholas R. Rhodes, DeAna McAdory, Sarmistha Halder Sinha, Naomi Kern, Julia Kent, Jessyln Strickland, Austin Wilson, Janis Beaird,James Ramage,  Jane F. Rasco, and John B. Vincent.  J. Biol. Inorg. Chem. 2011,16, 381-390.

Potential of Chromium(III) Picolinate for Reproductive or Developmental Toxicity Following Exposure of Male CD-1 Mice Prior to Mating. DeAna McAdory, Nicholas R. Rhodes, Felicia Briggins, Melissa M. Bailey, Kristin R. Di Bona, Craig Goodwin, John B. Vincent, and Jane. F. Rasco.  Biol. Trace Elem. Res. 2011, 143, 1666-1672.

Characterizing the Organic Component of Low-molecular-weight Chromium-binding Substance and Its Binding of Chromium.  Yuen Chen, Heather M. Watson,  Junjie Gao, Sarmistha Halder Sinha, Carolyn J. Cassady, and John B. Vincent. J. Nutr. 2011, 141, 1225-1232.

Effects of Transition Metal Ion Coordination on Collision-induced Dissociation of Polyalanines.  Heather M. Watson, John B. Vincent, and Carolyn J. Cassady,  J. Mass Spectrom. 2011, 46, 1099-1107.

Urinary Chromium Loss Associated with Diabetes is Offset by Increases in Absorption.  Nicholas R. Rhodes, DeAna McAdory, Sharifa Love, Kristin R. Di Bona, Yuan Chen, Kirsten Ansorge, Jasmina Hira, Julia Kent, Paul Lara, Jane F. Rasco, and John B. Vincent. J. Inorg. Biochem. 2010, 104, 790-797.