Enzymatic cross-linking of purple membranes catalyzed by bacterial transglutaminase

Citation
A. Seitz et al., Enzymatic cross-linking of purple membranes catalyzed by bacterial transglutaminase, BIOMACROMOL, 2(1), 2001, pp. 233-238
Citations number
27
Categorie Soggetti
Biochemistry & Biophysics","Organic Chemistry/Polymer Science
Journal title
BIOMACROMOLECULES
ISSN journal
15257797 → ACNP
Volume
2
Issue
1
Year of publication
2001
Pages
233 - 238
Database
ISI
SICI code
1525-7797(200121)2:1<233:ECOPMC>2.0.ZU;2-B
Abstract
It was found that bacterial transglutaminase (TGase) facilitates selective cross-linking of bacteriorhodopsin (BR) in purple membrane (PM) form under mild conditions. Fluorescent probes were used to detect that the membrane p rotein BR may act as a glutamine donor as well as a lysine donor for TGase. The binding sites were determined to be Gln-3 as the reactive glutamine, a nd Lys-129 is the corresponding lysine residue. Upon incubation of PM with TGase, cross-linking of PM patches can be achieved without an additional sp acer molecule. To our knowledge, this is the first time that an intermembra ne cross-linking of membrane bound proteins is reported. Furthermore, this finding may provide the ability to achieve covalent linkage of complete pur ple membrane patches to synthetic polymers.