Ewalt, Karla L. The Scripps Research Institute, La Jolla, California.
Schimmel, Paul Skaggs Institute for Chemical Biology, Scripps Research Institute, La Jolla, California.
Perlmann, Gertrude E. Formerly, Rockefeller University, New York, New York.
Manning, James M. Department of Biochemistry, Rockefeller University, New York, New York.
Last reviewed:November 2016
Show previous versions
- Amino acids
- Links to Primary Literature
- Additional Readings
A polymeric compound made up of various monomeric units called amino acids joined by peptide linkages. Proteins are central to the processes of life. They are fundamental components of all biological systems, performing a wide variety of structural and functional roles. For example, proteins are primary constituents of numerous structures of the body, including hair, tendons, muscle (Fig. 1), skin, and cartilage. Several hormones (for example, insulin and growth hormone) are proteins. The substances responsible for oxygen and electron transport (hemoglobin and cytochromes, respectively) are conjugated proteins that contain a metalloporphyrin (a combination of a porphyrin and a metal) as the prosthetic group. Chromosomes are highly complex nucleoproteins, that is, proteins conjugated with nucleic acids. Viruses are also nucleoprotein in nature. See also: Biopolymer; Chromosome; Cytochrome; Hemoglobin; Hormone; Virus
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information