... The analyses comprise absorbance, fluorescence and CD spectroscopy, crystallization, preliminary X-raymeasurements, mass spectrometry, N-terminal amino acidsequencing and 1D NMR spectroscopy. Intact ... crystallization, NMR spectroscopy and biochemicalanalyses of a- phycoerythrocyanin peptidesGeorg Wiegand1, Axel Parbel2*, Markus H. J. Seifert1, Tad A. Holak1 and Wolfgang Reuter11Max-Planck-Institut ... phycobiliprotein lyase: both the attachment of phy-cocyanobilin and the isomerization to phycoviolobilin are cata-lyzed by the proteins PecE and PecF encoded by thephycoerythrocyanin operon....