7 research outputs found
Narrowing the Gender Pay Gap by Providing Equal Opportunities: The Need for Tenured Female Professors in Higher STEM Institutions in an Effort to Recast Gender Norms
[no abstract
Logic, Not Evidence, Supports a Change in Expert Testimony Standards: Why Evidentiary Standards Promulgated by the Supreme Court for Scientific Expert Testimony are Inappropriate and Inefficient When Applied in Patent Infringement Suits
Cloning, Purification, and Partial Characterization of the Halobacterium sp. NRC-1 Minichromosome Maintenance (MCM) Helicase
The MCM gene from the archaeon Halobacterium, with and without its intein, was cloned into an Escherichia coli expression vector, overexpressed and the protein was purified and antibodies were generated. The antibodies were used to demonstrate that in vivo only the processed enzyme, without the intein, could be detected
Thermoplasma acidophilum Cdc6 protein stimulates MCM helicase activity by regulating its ATPase activity
The minichromosome maintenance (MCM) proteins are thought to function as the replicative helicases in archaea. In most archaeal species studied, the interaction between MCM and the initiator protein, Cdc6, inhibits helicase activity. To date, the only exception is the helicase and Cdc6 proteins from the archaeon Thermoplasma acidophilum. It was previously shown that when the Cdc6 protein interacts with MCM it substantially stimulates helicase activity. It is shown here that the mechanism by which the Cdc6 protein stimulates helicase activity is by stimulating the ATPase activity of MCM. Also, through the use of site-specific substitutions, and truncated and chimeric proteins, it was shown that an intact Cdc6 protein is required for this stimulation. ATP binding and hydrolysis by the Cdc6 protein is not needed for the stimulation. The data suggest that binding of Cdc6 protein to MCM protein changes the structure of the helicase, enhancing the catalytic hydrolysis of ATP and helicase activity