Molybdate affects glucocorticoid receptor chromatography on DEAE cellulose.

Area of Science:

• Biochemistry
• Molecular Biology
• Chromatography

Background:

• Glucocorticoid receptor (GR) research often involves chromatographic separation.
• Understanding factors influencing GR elution is vital for accurate analysis.
• DEAE cellulose chromatography is a common technique for protein separation.

Purpose of the Study:

• To investigate the impact of molybdate on the chromatographic behavior of the glucocorticoid receptor (GR).
• To determine if molybdate affects both transformed and untransformed GR elution profiles on DEAE cellulose.
• To ascertain the mechanism behind molybdate's effect on protein chromatography.

Main Methods:

• Ion-exchange chromatography using DEAE cellulose.
• Elution of glucocorticoid receptors with varying concentrations of molybdate (0-20 mM).
• Control experiments using bovine serum albumin (BSA) to assess molybdate's general protein effects.

Main Results:

• Molybdate progressively altered the elution positions of both transformed and untransformed GR.
• At 20 mM molybdate, the transformed GR eluted prior to the KCl gradient initiation.
• Observed changes were not attributable to buffer conductivity variations; molybdate directly influenced protein-chromatography interactions, as confirmed with BSA.

Conclusions:

• Molybdate demonstrably alters the chromatographic elution profiles of proteins, including the glucocorticoid receptor.
• Failure to account for molybdate's effect can lead to misinterpretations of transformed versus untransformed receptor proportions.
• This highlights the importance of considering buffer additives in chromatographic analyses.