Navigation Links
A catalogue of proteins

Working with colleagues from Denmark, Canada, China, and the U.S.A., the scientists have shown how cutting-edge methods can be used to catalogue the entire inventory of active proteins in cell organelles at a particular moment. Their work sheds considerable light on how cells use proteins. The work is published in the journal Cell (Cell 125, 1-13).

Cells are like small cities. They contain all the necessary parts that allow their infrastructure, function, growth, and communication to operate. For over a century scientists have been looking at the structures and organelles in cells using microscopic methods, and then drawing conclusions about their function. Biochemical methods have allowed scientists to examine the inner life of the cell, an organisational unit basic to all life. Now, they are clarifying its structures in detail: from mitochondria, the "factories" of cells, which create energy; to the endoplasmic reticulum, necessary for protein synthesis and metabolic processes; to the Golgi apparatus, responsible for lipid synthesis and producing important energy reserves for cell growth.

Now scientists led by Matthias Mann have specialised in identifying individual proteins in protein complexes. Proteins have various functions in a cell, from transport to mechanical support. As enzymes, they catalyse all kinds of metabolic processes. They are also important components of signal chains, like those which transmit information from the exterior of the cell to its nucleus. In this way, proteins also control the transcription of genetic information and the synthesis of new proteins that comes with it.

In this study, the proteome researchers looked at liver cells in mice. Using mass spectrometry, and by comparing databases, the scientists were able to detect more than 1400 proteins, localised in ten different cell compartments. Previous analyses had shown that certain proteins assign themselves clearly to particular cell organelles. When the scien tists took the protein complex apart, these proteins were used as markers. Proteins which appear together with these marker-proteins could now also be assigned their proper place in the inventory. This method, called protein correlation profiling, was developed by Matthias Mann and his colleagues, and has previously been successfully used to determine the composition of single cell-organelle protein.

After the individual "compartments" for the proteins were identified, the scientists compared corresponding protein sets of individual cell organelles. Among the 1400 different proteins that can be clearly mapped onto individual cell organs, around 40% of them also appear in other cell organs. This result can be compared with studies on yeast cells. Their proteins have stayed "true" to their cell organelles over the course of evolution. Their localisation has apparently remained stable over almost a billion years, as simple organisms evolved all the way to mammals.

These results are a milestone in cell biology. Matthias Mann says, "for the first time, we are able to determine where exactly in the cell large numbers of proteins belong. It allows a new understanding of their function and interaction with other cellular proteins and cell organelles." The researchers hope that protein correlation profiling will allow them to determine which proteins participate in failures of regulation. This could contribute to research into diseases which occur when communication between cells is disturbed.


'"/>

Source:Max-Planck-Gesellschaft


Related biology news :

1. UWs Rosetta software to unlock secrets of many human proteins
2. Global analysis of membrane proteins
3. UCSD discovery may provide novel method to generate medically useful proteins
4. A real time look at interactions between RNA and proteins
5. UW-Madison engineers squeeze secrets from proteins
6. Sea corals trick helps scientists tag proteins
7. Scientists solve sour taste proteins
8. Mechanism for neurodenegerative diseases linked to transport proteins
9. Iowa State researchers improving plastics made from corn and soy proteins
10. First major study of mammalian disorderly proteins
11. Living view in animals shows how cells decide to make proteins
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/31/2016)... 31, 2016   ... the "Company") LegacyXChange is excited to release ... soon to be launched online site for trading 100% ... ) will also provide potential shareholders a sense of ... to an industry that is notorious for fraud. The ...
(Date:3/29/2016)... , March 29, 2016 LegacyXChange, ... LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to announce ... used in a variety of writing instruments, ensuring athletes ... originally created collectibles from athletes on LegacyXChange will be ... of the DNA. Bill Bollander , ...
(Date:3/22/2016)... March 22, 2016 ... Sensors Market for Consumer Industry by Type (Image, ... Application (Communication & IT, Entertainment, Home Appliances, ... Forecast to 2022", published by MarketsandMarkets, the ... to reach USD 26.76 Billion by 2022, ...
Breaking Biology News(10 mins):
(Date:6/23/2016)...   Boston Biomedical , an industry leader ... target cancer stemness pathways, announced that its lead ... Designation from the U.S. Food and Drug Administration ... gastroesophageal junction (GEJ) cancer. Napabucasin is an orally ... stemness pathways by targeting STAT3, and is currently ...
(Date:6/23/2016)... -- Houston Methodist Willowbrook Hospital has signed a ... serve as their official health care provider. As ... provide sponsorship support, athletic training services, and most ... athletes and families. "We are excited ... to bring Houston Methodist quality services and programs ...
(Date:6/23/2016)... YORK , June, 23, 2016  The Biodesign ... to envision new ways to harness living systems and ... Modern Art (MoMA) in New York City ... than 130 participating students, showcased projects at MoMA,s Celeste ... Paola Antonelli , MoMA,s senior curator of architecture ...
(Date:6/23/2016)... ... June 23, 2016 , ... STACS DNA Inc., the sample ... the Arkansas State Crime Laboratory, has joined STACS DNA as a Field Application Specialist. ... said Jocelyn Tremblay, President and COO of STACS DNA. “In further expanding our capacity ...
Breaking Biology Technology: