Web Search results for protein - 142,000,000
Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino
...en.wikipedia.org
Protein - What Should You Eat? - The Nutrition Source - Harvard School of Public Health.
www.hsph.harvard.edu
They break down the
protein in food into basic units, called amino acids (say
... The amino acids then can be reused to make the
proteins your body needs to
...kidshealth.orgThe
protein entries in the Entrez search and retrieval system have been compiled from a variety of sources, including SwissProt, PIR, PRF, PDB,
...www.ncbi.nlm.nih.govMar 6, 2008
... What do you think about when you hear the word
protein?
... You'll find information about what foods have
protein and what happens when we
...www.cdc.govprotein n. Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of.
www.answers.com
Beef up your knowledge of
protein and good dietary sources.
www.webmd.com1998 - 2008
Protein Ltd. All Rights Reserved.
Protein is a registered trademark of
Protein Ltd. Served with love by (mt) Media Temple
...proteinos.com
Wikipedia
Protein
From Wikipedia, the free encyclopedia
A representation of the 3D structure of myoglobin showing coloured alpha helices. This protein was the first to have its structure solved by X-ray crystallography.
This article is about a class of biomolecules. For alternate uses, such as protein in nutrition, see Protein (disambiguation).
Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by a gene and encoded in the genetic code. Although this genetic code specifies 20 "standard" amino acids plus selenocysteine and - in certain archaea - pyrrolysine, the residues in a protein are sometimes chemically altered in post-translational modification: either before the protein can function in the cell, or as part of control mechanisms. Proteins can also work together to achieve a particular function, and they often associate to form stable complexes.[1]
Like other biological macromolecules such as polysaccharides and nucleic acids, proteins are essential parts of organisms and participate in every process within cells. Many proteins are enzymes that catalyze biochemical reactions and are vital to metabolism. Proteins also have structural or mechanical functions, such as actin and myosin in muscle and the proteins in the cytoskeleton, which form a system of scaffolding that maintains cell shape. Other proteins are important in cell signaling, immune responses, cell adhesion, and the cell cycle. Proteins are also necessary in animals' diets, since animals cannot synthesize all the amino acids they need and must obtain essential amino acids from food. Through the process of digestion, animals break down ingested protein into free amino acids that are then used in metabolism.
The word protein comes from the Greek word πρώτα ("prota"), meaning "of primary importance." Proteins were first described and named by the Swedish chemist Jöns Jakob Berzelius in 1838. However, the central role of proteins in living organisms was not fully appreciated until 1926, when James B. Sumner showed that the enzyme urease was a protein.[2] The first protein to be sequenced was insulin, by Frederick Sanger, who won the Nobel Prize for this achievement in 1958. The first protein structures to be solved included hemoglobin and myoglobin, by Max Perutz and Sir John Cowdery Kendrew, respectively, in 1958.[3][4] The three-dimensional structures of both proteins were first determined by x-ray diffraction analysis; Perutz and Kendrew shared the 1962 Nobel Prize in Chemistry for these discoveries.
Find more protein info on Wikipedia
