Ecker, Margit and Deutzmann, Rainer and Lehle, Ludwig and Mrsa, Vladimir and Tanner, Widmar (2006) Pir proteins of Saccharomyces cerevisiae are attached to beta-1,3-glucan by a new protein-carbohydrate linkage. The Journal of biological chemistry 281 (17), pp. 11523-11529.
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Other URL: http://dx.doi.org/10.1074/jbc.M600314200
A family of covalently linked cell wall proteins of Saccharomyces cerevisiae, called Pir proteins, are characterized by up to 10 conserved repeating units. Ccw5/Pir4p contains only one complete repeating sequence and its deletion caused a release of the protein into the medium. The exchange of each of three glutamines (Gln69, Gln74, Gln76) as well as one aspartic acid (Asp72) within the repeating unit leads to a loss of the protein from the cell wall. Amino acid sequencing revealed that only Gln74 is modified. Release of the protein with mild alkali, changed Gln74 to to glutamic acid, suggesting that Gln74 is involved in the linkage. Analysis by mass spectrometry showed that 5 hexoses are attached to Gln/Glu74. Sugar analysis revealed glucose as the only constituent. It is suggested that Pir proteins form novel, alkali labile ester linkages between the gamma-carboxyl group of glutamic acids, arising from specific glutamines, with hydroxyl groups of glucoses of beta-1,3-glucan chains. This transglutaminase-type reaction could take place extracellularly and would energetically proceed on the account of amido group elimination.
|Date:||28 April 2006|
|Institutions:||Biology, Preclinical Medicine > Institut für Botanik / Zellbiologie|
|Subjects:||500 Science > 580 Botanical sciences|
500 Science > 570 Life sciences
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||08 Feb 2007|
|Last Modified:||05 Aug 2009 13:25|