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Human hypoxanthine-guanine phosphoribosyltransferase. Evidence for tetrameric structure
The Journal of Biological Chemistry
|June 25, 1978
Summary
Researchers purified hypoxanthine-guanine phosphoribosyltransferase (HGPRT) from human red blood cells. The enzyme appears to exist as a tetramer in its native state, based on cross-linking studies.
Area of Science:
- Biochemistry
- Enzymology
- Human Physiology
Background:
- Hypoxanthine-guanine phosphoribosyltransferase (HGPRT) is a crucial enzyme in purine salvage pathways.
- Deficiency in HGPRT leads to Lesch-Nyhan syndrome, highlighting its importance in human health.
Purpose of the Study:
- To purify HGPRT from normal human erythrocytes.
- To characterize the subunit molecular weight and quaternary structure of purified HGPRT.
Main Methods:
- Affinity chromatography using a GMP column for enzyme purification.
- Cross-linking of the purified enzyme using dimethylsuberimidate, dimethyladipimidate, and glutaraldehyde.
- Analysis of protein species after cross-linking to determine enzyme structure.
Main Results:
- HGPRT was purified 23,000-fold from human erythrocytes.
- The subunit molecular weight of the purified enzyme was determined to be 24,000.
- Cross-linking studies revealed four protein species, suggesting a tetrameric structure for native HGPRT.
Conclusions:
- The study successfully purified HGPRT from human erythrocytes.
- Evidence suggests that HGPRT exists as a tetramer in its native form.
- Understanding HGPRT's structure is vital for comprehending purine metabolism and related disorders.