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Bovine testis acylphosphatase: purification and amino acid sequence
L Pazzagli1, G Cappugi, G Camici
1Department of Biochemical Sciences, University of Florence, Italy.
Journal of Protein Chemistry
|October 1, 1993
Summary
Researchers isolated and sequenced two bovine testis acylphosphatase isoenzymes (ACY1 and ACY2). These organ-common enzymes differ in length and amino terminus, highlighting variations in acylphosphatase structure.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Acylphosphatases are enzymes involved in cellular metabolism.
- Isoenzymes of acylphosphatase exist in various tissues.
- Understanding enzyme structure is crucial for function.
Purpose of the Study:
- To isolate and characterize molecular forms of acylphosphatase from bovine testis.
- To determine the amino acid sequences of these isolated forms.
- To compare these forms with previously identified acylphosphatase isoenzymes.
Main Methods:
- Isolation of acylphosphatase molecular forms from bovine testis.
- Amino acid sequencing of the purified enzymes.
- Comparative sequence analysis.
Main Results:
- Two distinct acylphosphatase molecular forms, ACY1 (98 residues) and ACY2 (100 residues), were isolated.
- Both forms are N-acetylated and share significant sequence homology.
- ACY2 possesses an additional Ser-Met tail at its amino terminus compared to ACY1.
- These bovine testis isoenzymes exhibit approximately 50% sequence difference from the bovine muscle isoenzyme.
Conclusions:
- Bovine testis contains at least two distinct acylphosphatase isoenzymes.
- Structural differences, particularly at the amino terminus, distinguish these isoenzymes.
- The identified forms are organ-common isoenzymes, suggesting broader functional roles.