Improving the Affinity and Selectivity of a Nonpeptide Series of Cholecystokinin-B/Gastrin Receptor Antagonists Based on the Dibenzobicyclo[2.2.2]octane Skeleton
作者:S. Barret Kalindjian、Ildiko M. Buck、Julia R. Cushnir、David J. Dunstone、Martin L. Hudson、Caroline M. R. Low、Iain M. McDonald、Michael J. Pether、Katherine I. M. Steel、Matthew J. Tozer
DOI:10.1021/jm00021a019
日期:1995.10
described a novel series of nonpeptidic cholecystokinin-B (CCKB)/gastrin receptor antagonists based on a dibenzobicyclo[2.2.2]octane skeleton. We wish now to report on compounds arising out of our earlier work which have substantially greater affinity as antagonists for the CCKB/gastrin receptor system and which maintain, or improve on, the already high selectivity with respect to CCKA receptors. Thus
Conjugates (3-5) of Tn, sialyl Tn and HIV-1-derived peptide antigen with a N-tetradecanoyl L-serine-β-alanine-containing D-glucosamine derivative, structurally related to lipid A, as an immunoadjuvant for the development of totally synthetic vaccines against cancers or HIV were synthesized. The mitogenic activity of compounds 3, 4 and 5 was stronger than that of lipid A analogs (1, 2).
Tn 抗原、唾液酸 Tn 抗原和 HIV-1 来源的肽抗原与一种结构类似于脂多糖 A (lipid A) 的 N-十四烷酰-L-丝氨酸-β-丙氨酸-含 D-葡糖胺衍生物偶联物(3-5),被用作免疫佐剂,用于开发完全合成针对癌症或 HIV 的疫苗。化合物 3、4 和 5 的促有丝分裂活性均强于脂多糖 A 类似物(1 和 2)。
Peptide Bond Isosteres: Ester or (<i>E</i>)-Alkene in the Backbone of the Collagen Triple Helix
作者:Cara L. Jenkins、Melissa M. Vasbinder、Scott J. Miller、Ronald T. Raines
DOI:10.1021/ol050780m
日期:2005.6.1
[structure: see text] Collagen is the most abundant protein in animals. Interstrand N-H...O=C hydrogenbonds between backbone amide groups form a ladder in the middle of the collagen triple helix. Isosteric replacement of the hydrogen-bond-donating amide with an ester or (E)-alkene markedly decreases the conformationalstability of the triple helix. Thus, this recurring hydrogen bond is critical to the
[结构:参见文字]胶原蛋白是动物中最丰富的蛋白质。主链酰胺基团之间的链间NH ... O = C氢键在胶原三螺旋的中间形成一个阶梯。用酯或(E)-烯烃的等氢取代给氢键的酰胺显着降低了三螺旋的构象稳定性。因此,这种重复的氢键对于胶原蛋白的结构完整性至关重要。在这种情况下,与(E)-链烯相比,酯-等排烷酯具有更高的稳定性。
Dipeptide-Catalyzed Asymmetric Aldol Condensation of Acetone with (N-Alkylated) Isatins
作者:Gianluigi Luppi、Pier Giorgio Cozzi、Magda Monari、Bernard Kaptein、Quirinus B. Broxterman、Claudia Tomasini
DOI:10.1021/jo050257l
日期:2005.9.1
The aldol condensation of acetone with several isatins is described. The desired compound was obtained in quantitative yield and with good enantioselectivities up to 77%. The best results were obtained with 10 mol % H-d-Pro-l-β3-hPhg-OBn as a catalyst, resulting in the preferential formation of the (R)-enantiomer. The absolute configuration of the newly formed chiral center has been assigned by an
Peptide derivatives having an inhibitory action on hydroxylating
申请人:Hoechst Aktiengesellschaft
公开号:US04797471A1
公开(公告)日:1989-01-10
The invention relates to peptide derivatives of the formula ##STR1## in which ##STR2## represents an acyl radical, B represents the radical of a dipeptide composed of a N.sup..omega. -acylated basic .alpha.-amino acid and another .alpha.-amino acid, and W represents hydroxyl or optionally substituted amino, to a process for their preparation, to agents containing them, and to their use.