ATP-Reactive Sites in the Bacteriophage λ Packaging Protein Terminase Lie in the N-Termini of Its Subunits, gpA and gpNu1
| Autor: | Baljeet Kaur Babbar, Marvin Gold |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Adenosine Triphosphatases
chemistry.chemical_classification Azides Chromatography Binding Sites Endodeoxyribonucleases biology Sequence analysis Virus Assembly Protein subunit Affinity Labels Peptide Photoaffinity Labels biology.organism_classification Bacteriophage lambda Amino acid Bacteriophage Adenosine Triphosphate Biochemistry chemistry Virology Escherichia coli Peptides Fluorescein-5-isothiocyanate |
| Zdroj: | Virology. 247:251-264 |
| ISSN: | 0042-6822 |
| Popis: | ATP-reactive sites in terminase and its subunits have been successfully identified using three different affinity analogs of ATP (2- and 8-azidoATP and FITC). GpA, the larger subunit of terminase, was shown to have a higher affinity for these analogs than gpNu1, the smaller subunit. The suitability of these reagents as affinity analogs of ATP was demonstrated by ATP protection experiments and in vitro assays done with the modified proteins. These analogs were thus shown to modify the ATP-reactive sites. The results obtained from these experiments also indicate the importance of subunit–subunit interactions in the holoenzyme. Terminase, gpA, and gpNu1 were modified with these analogs and the ATP-reactive sites were identified by isolating the modified peptide by reverse-phase chromatography. The sequence analysis of the modified peptides indicates a region including amino acids 18–35 in the N-terminus of gpNu1 and a region including amino acids 59–85 in the N-terminus of gpA as being the ATP-reactive sites. |
| Databáze: | OpenAIRE |
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