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Structural insights into pathogenic mutations in heme-dependent cystathionine-beta-synthase
Mamoru Yamanishi1, Omer Kabil, Suvajit Sen
1Redox Biology Center and Department of Biological Chemistry, University of Nebraska, Lincoln, NE 68588-0664, USA.
Journal of Inorganic Biochemistry
|October 31, 2006
Summary
Human cystathionine beta-synthase (CBS) regulates homocysteine levels. This review analyzes CBS mutations linked to hereditary hyperhomocysteinemia using structural models to understand disease mechanisms.
Area of Science:
- Biochemistry
- Enzymology
- Human Genetics
Background:
- Human cystathionine beta-synthase (CBS) is a pyridoxal phosphate-dependent hemeprotein crucial for managing intracellular homocysteine levels.
- CBS catalyzes the conversion of serine and homocysteine to cystathionine, a key step in the transsulfuration pathway.
- Hereditary hyperhomocysteinemia is a disorder linked to elevated homocysteine, often caused by CBS dysfunction.
Purpose of the Study:
- To conduct a structure-function analysis of human CBS.
- To investigate the impact of pathogenic mutations on CBS function in hereditary hyperhomocysteinemia.
- To correlate structural models with clinical observations of CBS mutations.
Main Methods:
- Utilized available structural models of full-length human CBS.
- Integrated data from crystallography, hydrogen-deuterium exchange mass spectrometry, and docking studies.
- Performed structure-function analysis on a selection of pathogenic CBS mutations.
Main Results:
- Identified specific structural features of CBS relevant to its enzymatic activity.
- Elucidated how certain mutations disrupt CBS structure and/or function.
- Provided a molecular basis for understanding the pathogenicity of specific CBS mutations.
Conclusions:
- Structural insights into CBS are vital for understanding hereditary hyperhomocysteinemia.
- The structure-function analysis highlights the importance of specific CBS domains for enzyme activity.
- This work provides a foundation for future therapeutic strategies targeting CBS dysfunction.
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