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An ATPase depending on the presence of single-stranded DNA from mouse myeloma
Abstract:
An ATPase was purified from mouse myeloma MOPC 70E the activity of which depends on the presence of single-stranded DNA and divalent cations such as Mg2+, Mn2+, Ca2+, Ni2+ or Fe2+. The enzyme splits both ribonucleoside and deoxyribonucleoside triphosphates but preferentially ATP and dATP yielding nucleoside diphosphates and inorganic phosphate. The enzyme has an absolute requirement for single-stranded DNA. Alternating double-stranded polydeoxynucleotides are only slight effective, and native double-stranded DNA, single-stranded and double-stranded RNAs as well as DNA - RNA hybrids are ineffective in stimulating the ATPase. The enzyme has further characterized by sedimentation in a sucrose density gradient (s20, w = 5.5 S) and by isoelectric focussing in an ampholine pH gradient (pI = 6.5).
Insights
This study purified a novel ATPase enzyme from mouse myeloma cells. The enzyme requires single-stranded DNA and divalent cations to hydrolyze nucleoside triphosphates, primarily ATP and dATP.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- ATPases are crucial enzymes involved in various cellular processes.
- Understanding the specific requirements and substrate preferences of ATPases is essential for elucidating their biological functions.
Purpose of the Study:
- To purify and characterize a novel ATPase from mouse myeloma MOPC 70E.
- To determine the enzyme's dependency on single-stranded DNA and divalent cations.
- To identify the enzyme's substrate specificity and catalytic activity.
Main Methods:
- Enzyme purification using established biochemical techniques.
- ATPase activity assays with various nucleotide triphosphates and DNA/RNA substrates.
- Enzyme characterization via sucrose density gradient sedimentation and isoelectric focusing.
Main Results:
- A novel ATPase was successfully purified from mouse myeloma MOPC 70E.
- Enzyme activity was dependent on single-stranded DNA and divalent cations (Mg2+, Mn2+, Ca2+, Ni2+, Fe2+).
- The enzyme hydrolyzed both ribonucleoside and deoxyribonucleoside triphosphates, with a preference for ATP and dATP.
Conclusions:
- The purified ATPase exhibits unique requirements for single-stranded DNA and specific divalent cations.
- This enzyme plays a potential role in cellular processes involving DNA metabolism or processing.
- Further research is warranted to explore the physiological relevance of this novel ATPase.