1188-07-4Relevant academic research and scientific papers
Binding Methylarginines and Methyllysines as Free Amino Acids: A Comparative Study of Multiple Host Classes**
Warmerdam, Zoey,Kamba, Bianca E.,Le, My-Hue,Schrader, Thomas,Isaacs, Lyle,Bayer, Peter,Hof, Fraser
, (2021/11/30)
Methylated free amino acids are an important class of targets for host-guest chemistry that have recognition properties distinct from those of methylated peptides and proteins. We present comparative binding studies for three different host classes that are each studied with multiple methylated arginines and lysines to determine fundamental structure-function relationships. The hosts studied are all anionic and include three calixarenes, two acyclic cucurbiturils, and two other cleft-like hosts, a clip and a tweezer. We determined the binding association constants for a panel of methylated amino acids using indicator displacement assays. The acyclic cucurbiturils display stronger binding to the methylated amino acids, and some unique patterns of selectivity. The two other cleft-like hosts follow two different trends, shallow host (clip) following similar trends to the calixarenes, and the other more closed host (tweezer) binding certain less-methylated amino acids stronger than their methylated counterparts. Molecular modelling sheds some light on the different preferences of the various hosts. The results identify hosts with new selectivities and with affinities in a range that could be useful for biomedical applications. The overall selectivity patterns are explained by a common framework that considers the geometry, depth of binding pockets, and functional group participation across all host classes.
Peptide Tyrosinase Activators
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, (2015/06/10)
Peptides that increase melanin synthesis are provided. These peptides include pentapeptides YSSWY, YRSRK, and their variants. The peptides may activate the enzymatic activity of tyrosinase to increase melanin synthesis. The pharmaceutical, cosmetic, and other compositions including the peptides are also provided. The methods of increasing melanin production in epidermis of a subject are provided where the methods include administering compositions comprising an amount of one or more peptides effective to increase the melanin production. The methods also include treating vitiligo or other hypopigmentation disorders with compositions including one or more peptides.
Identification of new peptide amides as selective cathepsin L inhibitors: The first step towards selective irreversible inhibitors?
Torkar, Ana,Lenar?i?, Brigita,Lah, Tamara,Dive, Vincent,Devel, Laurent
supporting information, p. 2968 - 2973 (2013/06/27)
A small library of peptide amides was designed to profile the cathepsin L active site. Within the cathepsin family of cysteine proteases, the first round of selection was on cathepsin L and cathepsin B, and then selected hits were further evaluated for binding to cathepsin K and cathepsin S. Five highly selective sequences with submicromolar affinities towards cathepsin L were identified. An acyloxymethyl ketone warhead was then attached to these sequences. Although these original irreversible inhibitors inactivate cathepsin L, it appears that the nature of the warhead drastically impact the selectivity profile of the resulting covalent inhibitors.
Peptides with an insulin-like action
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, (2008/06/13)
Peptides with an insulin-like action, of formula I: STR1 in which G is a hydrogen atom, an amino add residue, or a monosubstituted or polysubstituted amino acid; D is an amino acid residue, a phosphoamino acid residue, a monosaccharide residue, or a covalent bond; E is --NH--(CH2)n --NR52, a glycerol residue, or --NH--(CH2)p --R6 --R7 ; R1 is (C1 -C4)-alkyl or =O; R2 is a sulfhydryl protecting group, (C1 -C3)-alkyl, or a hydrogen atom; R3 and R4, independently of one another, are a hydrogen atom or methyl; R5, each being identical or different, is a hydrogen atom, 1 to 6 monosaccharide residues, or 1 to 6 monosubstituted or polysubstituted monosaccharide residues; R6 is O PO4 H, PO2 H, NHCOO, S or OCOO; R7 is a hydrogen atom, 1 to 6 monosaccharide residues, or 1 to 6 monosubstituted or polysubstituted monosaccharide residues; w is an integer 1 or 2; their preparation and use for treatment of diabetes mellitus or insulin-independent diabetes.
Spontaneous N epsilon-methylation of L-lysine by formaldehyde.
Tyihak,Trezl,Rusznak
, p. 18 - 20 (2007/10/02)
It has been found that the conversion of L-lysine (1) into its corresponding N epsilon-methylated derivatives, mainly N epsilon-mono-methyl-L-lysine (5; MML), but also N epsilon, N epsilon-dimethyl-L-lysine (DML) and N epsilon, N epsilon, N epsilon-trimethyl-L-lisine (TML) takes place by treatment with formaldehyde in spontaneous reaction. The identification of N epsilon-methylated lysines was carried out by different chromatographic and spectroscopic methods. This spontaneous N epsilon-methylation of L-lysine by formaldehyde may also play an important role in living organisms.
