Rabbit Tamm-Horsfall urinary glycoprotein. Chemical composition and subunit structure

Area of Science:

• Biochemistry
• Urology

Background:

• Tamm-Horsfall glycoprotein (THG) is a major protein found in mammalian urine.
• Understanding the structure and properties of THG from different species can provide insights into its biological functions.

Purpose of the Study:

• To isolate and characterize Tamm-Horsfall glycoprotein (THG) from rabbit urine.
• To determine its chemical composition, subunit structure, and immunological properties.

Main Methods:

• Isolation and purification of THG using ultracentrifugation and electrophoresis.
• Chemical composition analysis (carbohydrate and amino acid content).
• Molecular weight determination using gel filtration and disc gel electrophoresis.
• N-terminal amino acid analysis.
• Immunological cross-reactivity studies.

Main Results:

• Homogeneous preparation of rabbit THG was obtained.
• THG contains approximately 31% carbohydrate, with amino acid composition similar to human THG.
• Leucine was identified as the sole N-terminal amino acid.
• The subunit molecular weight was determined to be approximately 84,000 +/- 6,000.
• Disulfide bonds were found to be intrachain.
• Immunological cross-reactivity was observed between rabbit and human THG.

Conclusions:

• Rabbit Tamm-Horsfall glycoprotein shares structural and immunological similarities with its human counterpart.
• This study provides a detailed characterization of rabbit THG, contributing to comparative studies of this important urinary protein.