The stunning pace of advancement in uncovering the molecular basis for human disease has not been matched by a corresponding profusion of drugs that exploit these newly gained mechanistic insights. Though not one single factor is responsible for this lag in pharmaceutical innovation, there is good reason to believe that a major factor lies in the limited toolkit of molecules available to drug discoverers today. The great majority of approved drugs and investigational agents currently undergoing human clinical testing belong to two broad molecular classes, namely small molecules and biologicals. Small molecules typically possess fewer than a hundred atoms, with a molecular mass under 1000 daltons, whereas biologicals may possess thousands of atoms and may reach masses above 100,000 daltons. The limited size of small molecules can endow them with highly benefi cial pharmaceutical properties, such as the ability to penetrate broadly and deeply into the tissue of living animals, and to diffuse passively across biological hindrances such as the outer cell membrane and the blood – brain barrier. But this economy of atoms also places signifi cant limitations on the targeting ability of small molecules. With only a limited surface area available for engagement in energetically favorable contacts with a molecular target, small molecules require engulfment by their targets in order to maximize the total contact surface area. This simple biophysical imperative underlies the well known principle that small molecules are, for the most part, capable of targeting only those proteins that possess a deep surface involution lined with hydrophobic
This chapter contains sections titled: I. Basal Bodies and Centrioles II. Basal Body Replication and Generation of Basal Body Nonequivalence III. Structure of Basal Bodies IV. The Transition Zone V. Distal Striated Fibers and Proximal Fibers VI. Mutations with Altered Basal Bodies VII. The Role of Basal Body Nonequivalence VIII. Templating Ciliary Asymmetries by the Basal Body IX. Mitotic Asymmetry X. Why Are Basal Body and Centriole Asymmetries Important? XI. Genes with Connections to Human Disease XII. Conclusions Acknowledgments References
International Journal of Developmental NeuroscienceVolume 24, Issue 8 p. 469-469 Abstract [K2]: Signaling networks that control synapse development and cognitive function M.E. Greenberg, M.E. Greenberg Neurobiology Program, Children's Hospital and Harvard Medical School, USASearch for more papers by this author M.E. Greenberg, M.E. Greenberg Neurobiology Program, Children's Hospital and Harvard Medical School, USASearch for more papers by this author First published: 16 November 2006 https://doi.org/10.1016/j.ijdevneu.2006.09.060Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article. Volume24, Issue8ABSTRACTS TO THE 16TH BIENNIAL MEETING OF THE INTERNATIONAL SOCIETY FOR DEVELOPMENTAL NEUROSCIENCE, 24‐28 AUGUST 2006, BANFF, CANADADecember 2006Pages 469-469 RelatedInformation
This chapter contains sections titled: I. Introduction II. Protein Translocation into the ER III. Different Modes of Translocation IV. Structure and Function of the Translocation Channel V. Opening the Channel across the Membrane VI. The Pore VII. Oligomeric Translocation Channels VIII. Membrane Protein Integration IX. Maintaining the Permeability Barrier X. Transport of Proteins Out of the ER XI. Perspective Acknowledgment References
Dr. David Julius used capsaicin, the active component in chili peppers, to identify the nerve sensors that allow the skin to respond to heat and pain. Dr. David Julius was awarded the 2021 Nobel Prize in Physiology and Medicine jointly with Ardem Patapoutian for their discoveries of receptors for temperature and touch. Dr. Julius discovered molecular mechanisms of pain sensation and heat, including the characterization of the receptors that detect capsaicin, menthol, and temperature. Dr. Julius earned his undergraduate degree Institute of Technology and attained his doctorate University California, In 1997, his laboratory at the University of California, San Francisco cloned and characterized the transient receptor potential (TRPV1) channel, which is the receptor that detects capsaicin, the chemical in chili peppers that makes them “hot” . Subsequently, Dr. Julius’s laboratory contributed to the study of nociception by discovering other TRP channels that detect a range of temperatures and chemicals. These discoveries are vital to the development of therapeutics for chronic pain and other conditions.
When I gave my Harvey lecture, which was a great honor for me, I told the story of our efforts to understand aging. We began our studies in the early 1990s. At that time, and for years before, many people assumed that aging was a haphazard process, not subject to regulation. Our tissues just break down, and we die. But the more I thought about it, the more I started to question this view. A mouse lives two years, whereas a bat can live 30 years or more. A rat lives three years; a squirrel, 25 (Fig. 2.1). These animals differ by their genes, so there must be genes that affect aging. Also, nothing in biology seems to “just happen”; everything seems to be regulated, often in quite an extraordinary way. My experience as a developmental biologist sharpened my thoughts about aging. People were once very skeptical about looking for developmental genes. Treating frog embryos with acid can produce a second head, and inhibiting pyrimidine synthesis in flies produces small wings, so many people thought that genes affecting development would also affect things like the Krebs cycle, or pH. They were wrong. There is a dedicated regulatory circuitry for pattern formation. In addition, many people thought that developmental mechanisms would differ completely in different kinds of animals, but again they were wrong. In fact, the degree of evolutionary conservation is striking. So it seemed to me that something as fundamental as aging might also be subject to regulation. Maybe there would be a molecular longevity “dial,” like a thermostat, that is universal but set to run at different rates in different kinds of animals. The dial would be turned up in mice (which age quickly) and
