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. Author manuscript; available in PMC: 2010 Sep 23.
Published in final edited form as: J Am Chem Soc. 2009 Sep 23;131(37):13523–13530. doi: 10.1021/ja9054417

Figure 3.

Figure 3

Stereospecificity of KtzO and KtzP. KtzO and KtzP products were cleaved off the PCP, derivatized with dabsyl-Cl, analyzed via HPLC-MS and compared with synthetic standards of the dabsylated L-β-hydroxyglutamic acids. The KtzP product co-elutes with the Dab-L-erythro-hGlu and the KtzO product with the threo form. High resolution mass spectrometric analyses of the peaks (observed [M+H]+= 451.1287 m/z) are in accordance with the theoretical masses (451.1282 m/z).