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Glutamic acid decarboxylase cDNA: nucleotide sequence encoding an enzymatically active fusion protein
Summary
Researchers sequenced feline Glutamic Acid Decarboxylase (GAD) cDNA, revealing a 625-codon open reading frame. This sequence contains a pyridoxal phosphate-binding site crucial for GAD enzyme activity.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Glutamic acid decarboxylase (GAD) is essential for synthesizing GABA, the primary inhibitory neurotransmitter in the mammalian brain.
- A lambda gt-11 recombinant, lambda-GAD, containing feline GAD cDNA, has been previously isolated.
- The fusion protein encoded by lambda GAD exhibits enzymatic activity, converting glutamate to GABA and CO2.
Purpose of the Study:
- To determine the nucleotide sequence of feline GAD cDNA.
- To analyze the structural features of the feline GAD sequence, including potential active sites.
Main Methods:
- Nucleotide sequencing of feline GAD cDNA.
- Bioinformatic analysis of the derived GAD sequence.
Main Results:
- The feline GAD cDNA sequence comprises 2265 bases with a 625-codon open reading frame.
- A conserved pyridoxal phosphate-binding site (Asn-Pro-His-Lys) was identified, matching that of porcine DOPA decarboxylase.
- The sequence from nucleotide 118 (putative start site) predicts characteristics consistent with known GAD properties.
Conclusions:
- The nucleotide sequence of feline GAD cDNA has been elucidated.
- Structural analysis reveals conserved functional domains, providing insights into GAD's catalytic mechanism.
- This data contributes to understanding the molecular basis of GABA synthesis in the mammalian brain.