Jan. 16, 2013 - NEWARK, N.J. – One of the most extraordinary properties of living cells is their ability to precisely reproduce themselves through processes that transfer genetic information from one cell to the next. However, there are times when one of the steps of information transfer, transcription, goes awry at the cellular level, potentially producing diseases such as cancer and other health disorders. Unraveling how those processes work and how substandard transcription can be prevented is a major goal of biomedical science. Progress in this area may also lead the way toward development of drugs that target the genetic transcription process in disease-causing microbes.
A research team led by Arkady Mustaev, PhD, of the Public Health Research Institute (PHRI) at the University of Medicine and Dentistry of New Jersey-New Jersey Medical School, has published a study posted online by the Journal of Biological Chemistry, that describes an effort by the investigators to understand the underlying mechanisms of high precision (fidelity) of RNA synthesis by RNA polymerase, the major enzyme that promotes the transcription process. They attempted to influence the role of active center tuning (ACT) -- a mechanism they first identified -- in the process of transcription fidelity, which is the accurate copying of genetic information.
ACT is a rearrangement of the RNA polymerase catalytic center from an inactive to a catalytically proficient state. The investigators found that both reactions of NTP polymerization and hydrolytic RNA proofreading are performed by the same active center that includes two magnesium (Mg) ions coordinated by aspartate triad. The active center is normally “turned off” since it is missing one of Mg ions. Correct NTP substrates as well as misincorporated RNA residues can promote ACT by inclusion of the missing Mg ion through establishing recognition contacts in the active center. Incorrect substrates cannot trigger ACT and are rejected. The investigators also demonstrate that transcript cleavage factors Gre build on ACT mechanism by providing the residues for stabilization of catalytic Mg ion and for activation of the attacking water causing 3000-4000-fold reaction enhancement thereby strongly reinforcing proofreading.
The suggested ACT mechanism is fundamentally different from that proposed for DNA replication enzyme, DNA polymerase (DNAP) in which the active centers for DNA synthesis and proofreading are separated and discrimination between deoxy- and ribo-substrate is achieved through strict fitting requirements for the sugar rather than through active center rearrangement. In DNAP active center carboxylates stem from rigid scaffolds, while in multisubunit RNAP they reside in an apparently flexible loop. ACT is accompanied by significant re-shaping of the loop, which would not be possible in DNAP.
This study was supported by NIH grant RO1 GM-30717-21.
Journalists who wish to speak with Dr. Arkady Mustaev should contact Rob Forman, UMDNJ Chief of News Services, at 973-972-7276 or firstname.lastname@example.org .
The Public Health Research Institute (PHRI) (www.phri.org) is a 71-year-old biomedical research organization that emphasizes translational approaches to overcome critical issues of infectious diseases. Founded in New York City, PHRI became an academic affiliate of the New Jersey Medical School-University of Medicine and Dentistry of New Jersey (UMDNJ) in 2006. PHRI’s 23 laboratories work on a wide range of infectious diseases issues including HIV and other viruses, TB, hospital and community acquired bacterial infections, fungal infections, biodefense and drug resistance. Fundamental knowledge of the disease process and its components is used to develop a new generation of diagnostics, therapeutics and vaccines. For more than 7 decades, PHRI’s culture of research innovation and excellence has led to important new discoveries in science and medicine.
The University of Medicine and Dentistry of New Jersey (UMDNJ) is New Jersey’s only health sciences university with more than 6,000 students on five campuses attending three medical schools, the State’s only dental school, a graduate school of biomedical sciences, a school of health related professions, a school of nursing and New Jersey’s only school of public health. UMDNJ operates University Hospital, a Level I Trauma Center in Newark, and University Behavioral HealthCare, which provides a continuum of healthcare services with multiple locations throughout the State.