Modern bioanalysis of proteins by electrophoretic techniques.

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• Metallothionein (MT) is a cysteine-rich protein known for binding heavy metals.
• MT and related proteins are found across diverse species, including mammals, plants, and fungi.
• MT is recognized as a potential biomarker for cancer and is extensively studied for its biological roles.

Purpose of the Study:

• To develop and optimize a protocol for separating and quantifying major mammalian metallothionein isoforms (MT-1 and MT-2).
• To enable the study of basic metallothionein behavior and facilitate their quantification.

Main Methods:

• Capillary electrophoresis (CE) coupled with a UV detector was employed for MT isoform separation.
• Optimized background electrolyte: 20 mM sodium borate buffer (pH 9.5).
• Separation performed in a 75 μm internal diameter fused silica capillary at an electric field intensity of 350 V/cm, with detection at 254 nm.

Main Results:

• Successful separation of two major mammalian MT isoforms (MT-1 and MT-2) was achieved.
• The developed protocol allows for quantification of MT isoforms with a detection limit in the ng/μL range.
• Characterization of MT isoform behavior under optimized CE conditions.

Conclusions:

• The described CE protocol provides an effective method for separating and quantifying mammalian MT isoforms.
• This technique supports further research into MT's role in biological systems and disease.
• The protocol's sensitivity makes it valuable for studying MT as a potential cancer marker.