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Synapsin I is structurally similar to ATP-utilizing enzymes
1Howard Hughes Medical Institute, Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas 75235-9050, USA.
The EMBO Journal
|March 28, 1998
Summary
Synapsins, crucial nerve terminal proteins, were structurally analyzed. Findings reveal synapsins bind ATP in a calcium-dependent manner, suggesting they function as ATP-utilizing enzymes.
Area of Science:
- Neuroscience
- Structural Biology
- Biochemistry
Background:
- Synapsins are key proteins regulating nerve terminal function.
- The C-domain is the most conserved region among synapsins.
Purpose of the Study:
- To determine the crystal structure of the synapsin C-domain (synC).
- To investigate the ATP and Ca2+ binding properties of synC.
Main Methods:
- X-ray crystallography was used to determine the structure of bovine synapsin I's C-domain (synC).
- Complex structures of synC with ATPgammaS and Ca2+ were analyzed.
Main Results:
- SynC forms compact, dimeric structures.
- SynC monomers exhibit structural similarity to ATP-utilizing enzymes.
- SynC binds ATP in a Ca2+-dependent manner, showing preference for Ca2+ over Mg2+.
Conclusions:
- The structure of synC provides insights into synapsin function.
- Results suggest synapsins may function as ATP-utilizing enzymes, impacting nerve terminal regulation.