146346-81-8Relevant articles and documents
The role of phosphopeptides in the mineralisation of silica
Daus, Fabian,Geyer, Armin,Hampp, Norbert,Pfeifer, Erik,Seipp, Kevin
, p. 700 - 706 (2020)
We investigated the silicification activity of hyperphosphorylated peptides in combination with long-chain polyamines (LCPA). The bioinspired in vitro silicification experiments with peptides containing different amounts of phosphorylated serines showed structure-activity dependence by altering the amount and morphology of the silica precipitate. Our study provides an explanation for the considerable metabolic role of diatoms in the synthesis of hyperphosphorylated poly-cationic peptides such as natSil-1A1. The efficient late-stage phosphorylation of peptides yielded a synthetic heptaphosphopeptide whose silicification properties resemble those of natSil-1A1. As opposed to this, unphosphorylated poly-cationic peptides or LCPA require concentrations above 1 mM for silicification. Hyperphosphorylated peptides showed a linear dependence between the amount of dissolved peptides and the amount of precipitated silica in the concentration range below 1 mM. Under mildly acidic conditions and short precipitation times, the concentration of the added LCPA determined the size of the silica spheres.
Total Synthesis of Scytonemide A Employing Weinreb AM Solid-Phase Resin
Wilson, Tyler A.,Tokarski, Robert J.,Sullivan, Peter,Demoret, Robert M.,Orjala, Jimmy,Rakotondraibe, L. Harinantenaina,Fuchs, James R.
, p. 534 - 542 (2018/03/30)
The human 20S proteasome inhibitor scytonemide A (1), a macrocyclic imine originally isolated from the cyanobacterium Scytonema hofmanni, was synthesized via a biomimetic solid-phase peptide synthesis (SPPS) approach employing the Weinreb AM resin. Utilizing this approach, cyclization of the protected heptapeptide via formation of the imine bond occurred spontaneously upon cleavage from the resin in the presence of a reducing agent and subsequent aqueous workup. The final deprotection step necessary to produce the natural product was accomplished under slightly basic conditions, facilitating cleavage of the silyl ether group while leaving the macrocycle intact. Purification of the synthetic scytonemide A was accomplished via normal-phase flash column chromatography, potentially facilitating larger scale preparation of the compound necessary for future mechanistic and SAR studies. The structure of the target compound was confirmed by NMR spectroscopy, which also shed light on differences in the spectroscopic data obtained for the synthetic and natural scytonemide A samples for some of the amide and alcohol signals in the 1H NMR spectrum.
Synthesis of N-protected N-methyl serine and threonine
Luo, Yue,Evindar, Ghotas,Fishlock, Dan,Lajoie, Gilles A
, p. 3807 - 3809 (2007/10/03)
Two efficient and convenient syntheses of N-Cbz and N-Fmoc N-methyl serine and threonine are described. The amino acid side-chain alcohol can be protected as a TBDMS ether in very good yield or left free, followed by the formation and subsequent reduction of the corresponding oxazolidinone.
