Structure-Function Relationship Study of Parathyroid Hormone (1–11) Analogues Containing D-AA

Caporale, Andrea; Fiori, N.; Schievano, Elisabetta; Wittelsberger, Angela; Mammi, Stefano; Chorev, Michael; Peggion, Evaristo

doi:10.1007/978-0-387-73657-0_50

Cited by 4 publications

(1 citation statement)

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“…Fmoc-Aib-OH was purchased from NeoMPs (Strasbourg, France). Only D-Har was synthesised as previously reported (Caporale et al 2009b). DMF dried over molecular sieves (H 2 O \ 0.01%) and DIPEA was purchased from Fluka (Buchs, Switzerland).…”

Section: Generalmentioning

confidence: 99%

Design, conformational studies and analysis of structure–function relationships of PTH (1–11) analogues: the essential role of Val in position 2

et al. 2011

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The N-terminal 1-34 segment of parathyroid hormone (PTH) is fully active in vitro and in vivo and it elicits all the biological responses characteristic of the native intact PTH. Recent studies reported potent helical analogues of the PTH (1-11) with helicity-enhancing substitutions. This work describes the synthesis, biological activity, and conformational studies of analogues obtained from the most active non-natural PTH (1-11) peptide H-Aib-Val-Aib-Glu-Ile-Gln-Leu-Nle-His-Gln-Har-NH2; specifically, the replacement of Val in position 2 with D-Val, L-(αMe)-Val and N-isopropyl-Gly was studied. The synthesized analogues were characterized functionally by in-cell assays and their structures were determined by CD and NMR spectroscopy. To clarify the relationship between the structure and activity, the structural data were used to generate a pharmacophoric model, obtained overlapping all the analogues. This model underlines the fundamental functional role of the side chain of Val2 and, at the same time, reveals that the introduction of conformationally constrained Cα-tetrasubstituted α-amino acids in the peptides increases their helical content, but does not necessarily ensure significant biological activity.

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Section: Generalmentioning

confidence: 99%