- Intramolecular ligation of carbonyl oxygen to central zinc in synthetic oligopeptide-linked zinc-porphyrins
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Oligopeptide-linked zinc-porphyrins were prepared (oligopeptide = -Phe(m)-Ala(n)-OMe and porphyrin = 5,15-diaryl-2,3,7,8,12,13,17,18-octaethylporphyrin). 1H NMR, IR, visible, and CD spectra of the synthetic molecule in a chlorinated methane (CDCl3 or CH2Cl2) showed that the carbonyl oxygen of the N-terminal amino acid of the linked peptide should ligate the central zine metal in the molecule as the axial ligand to form a pentacoordinated zinc-porphyrin. The coordination of the zinc with the peptide framework changed the optical and electrical properties, indicating that such ligation might control the reactivity in biological metallotetrapyrrole-protein systems as well as the coordination to the peptide residue.
- Tamiaki,Kiyomori,Maruyama
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p. 2478 - 2486
(2007/10/02)
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- Thermitase - A Thermostable Serine Protease. I. Synthesis of Alanine Peptide Esters as Substrates of the Enzyme
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The synthesis of N-acetylated and N-succinylated peptide esters of alanine is described.The peptides are built up from the Z-protected peptides by liquid phase fragment condensation and by acylation of the deprotected peptide esters.The kinetic parameters Km and kcat of some compounds are presented.
- Jahreis, Guenther,Fittkau, Siegfried
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