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Aspergillus ficuum phytase: complete primary structure elucidation by chemical sequencing
1Southern Regional Research Center, ARS, USDA, New Orleans, Louisiana 70124.
Biochemical and Biophysical Research Communications
|April 30, 1993
Summary
Researchers determined the primary structure of Aspergillus ficuum phytase, a 441-residue protein. This phytase enzyme contains a putative active site homologous to acid phosphatases.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- Phytases are crucial enzymes for breaking down phytic acid.
- Understanding enzyme structure is key to optimizing function.
Purpose of the Study:
- To elucidate the primary structure of Aspergillus ficuum phytase.
- To identify key structural features, including the active site.
Main Methods:
- Peptide sequencing to determine amino acid sequence.
- Bioinformatic analysis for molecular mass and pI estimation.
- Analysis of amino acid composition and glycosylation.
Main Results:
- The unglycosylated Aspergillus ficuum phytase is a 441-residue protein (48.5-KDa).
- The estimated isoelectric point (pI) is 4.76, with 9 of 19 Asn residues being glycosylated.
- The enzyme comprises 37% non-polar, 42% polar, 11.5% acidic, and 9.5% basic amino acids.
- A putative active site (RHG sequence) was identified in the N-terminal region.
Conclusions:
- The primary structure of Aspergillus ficuum phytase has been determined.
- The active site shows homology to microbial and mammalian acid phosphatases and phosphoglycerate mutase.
- Structural insights provide a basis for understanding phytase function and potential applications.