Carbohydrates are vital to life on Earth. In their simplest form, they serve as an elemental energy source for sustaining life. For the most part, however, carbohydrates appear not as simple sugars but as intricate molecular conjugates, or glycans. Glycans come in many shapes and sizes, from linear chains (polysaccharides) to strongly branched complexes bristling with antennae-like arms. And although proteins and nucleic acids like DNA have traditionally attracted far more scientific attention, glycans are also vital to life. They are omnipresent in nature, creating the complex sugar coat that surrounds the cells of virtually every organism and filling the spaces between these cells. As part of this so-called extracellular matrix, glycans, with their diverse chemical configurations, have a vital role in transmitting important biochemical signals from and between cells. In this way, these sugars guide the cellular communication that is vital for healthy cell and tissue development and physiological function.
The Sweet Science of Glycobiology
Complex carbohydrates, molecules that are specially vital for communication between cells, are coming under systematic research. Ram Sasisekharan and James R. Myette See: Glycobiology.
The central paradigm of modern molecular biology is that biological information flows from DNA to RNA to protein. The power of this idea lies not only in its template-driven precision, but also in the capability to manipulate any one type of molecules based on knowledge of another. With the upcoming completion of the genomic sequences of humans and several other usually studied model organisms, even more spectacular gains in the understanding of organical systems are anticipated.
In actual fact, creating a cell needs two other major types of molecules: lipids and carbohydrates. These molecules can serve as intermediates in producing energy, as signaling elements, or as structural components.
The structural roles of carbohydrates are particularly important in the construction of intricate multicellular organs and organisms, which require interactions of cells with one another and with the nearby matrix. Indeed, every cell and various macromolecules in nature carry a dense and intricate array of covalently attached sugar chains (called oligosaccharides or glycans). In some instances, these glycans can also be free-standing entities.
Since most glycans are on the outer surface of cellular and produced macromolecules, they are in a position to control or regulate a wide variety of actions in cell-cell and cell-matrix interactions vital to the development and function of all complex multicellular organisms and also interactions between organisms (e.g., between host and parasite). In addition, simple, strongly dynamic protein-bound glycans are abundant in the nucleus and cytoplasm, where they seem to serve as regulatory switches.
eliminate scars, imperfections and dermal aliments thanks to a biological skin care solution elaborated to rejuvenate your skin while making it softer and healthier. Browse our website to read more information about this wonderful Mother Nature's gift.
Please Rate this Article
Click the XML Icon Above to Receive Acne Articles Via RSS!
