Salem Michèle, Mauguen Yves, Prangé Thierry
Laboratoire de Cristallographie et RMN Biologiques (UMR 8015 CNRS), Faculté de Pharmacie, Université Descartes, 4 Avenue de l'Observatoire, 75006 Paris, France.
Acta Crystallogr Sect F Struct Biol Cryst Commun. 2010 Mar 1;66(Pt 3):225-8. doi: 10.1107/S1744309109054037. Epub 2010 Feb 23.
In addition to the common use of glutaraldehyde to nonspecifically cross-link protein crystals through lysine residues disposed on the surface of the protein, the use of gentle vapour diffusion of glutaraldehyde offers a convenient way to limit polymerization and to allow slow diffusion throughout the crystal. In the case of trimeric barnase crystals, a specific cross-link was observed between an lysine side chain and an arginine side chain that were spatially disposed at the ideal distance on the protein surface in the three monomers. Here, the direct observation of a specific Lys-Arg cross-link site is reported and a mechanism is proposed for the reaction.
除了常用戊二醛通过蛋白质表面的赖氨酸残基进行非特异性交联蛋白质晶体外,采用温和的戊二醛蒸汽扩散法提供了一种限制聚合反应并使戊二醛在整个晶体中缓慢扩散的便捷方法。在三聚体核糖核酸酶晶体的情况下,观察到一个赖氨酸侧链和一个精氨酸侧链之间存在特异性交联,这两个侧链在三个单体的蛋白质表面上以理想距离空间排列。本文报道了对一个特定赖氨酸-精氨酸交联位点的直接观察结果,并提出了该反应的机制。