Two alternative conformational states of α,α-dialkylglycyl-L-prolyl sequences governed by presence/absence of an NH group directly following the proline residue. X-Ray crystal and molecular structures of Boc-D-Iva-L-Pro-NHBzl and Boc-L-Iva-L-Pro-NHBzl
摘要:
The crystal structures of the isovaline-containing dipeptides, Boc-D-Iva-L-Pro-NHBzl 4 and Boc-L-Iva-L-Pro-NHBzl 5 were determined by X-ray diffraction. The diastereoisomeric peptides adopt intramolecular hydrogen-bonded beta-turn conformations closely similar to each other (4:phi(Iva) -51 degrees, psi(Iva) -38 degrees, phi(Pro) - 70 degrees and psi(Pro) -17 degrees and 5:phi(Iva) -53 degrees, psi(Iva) -35 degrees, phi(Pro) -72 degrees and psi(Pro) -14 degrees). The Pro ring of each peptide is in CY-exo conformation. These conformations are essentially the same as those in the reported crystal structures of the Aib-L-Pro sequence possessing an NH group directly attached to the carbonyl of the L-Pro, indicating that replacement of either one of the two methyl groups of the Aib moiety with an ethyl group does not cause any significant change in the beta-turn conformation of the Aib-L-Pro sequence in the crystalline state.CD spectral analysis of the terminal chromophoric group-carrying peptides Dnp-Gly-X-L-Pro-Gly-pNA (X = Aib 6 and D/L-Iva 7/8) has shown that these three tetrapeptides in CHCl3 and THF solutions also adopt a beta-turn-type conformation. CD spectra of glycolic acid residue-containing analogues in place of the fourth Gly residue revealed a lack of beta-turn tendency in these analogues, indicating the importance of intramolecular hydrogen bonding for the beta-turn conformation of the central dipeptide moieties. The results are consistent with the reported unturned crystal structures of Aib-L-Pro and D/L-Iva-L-Pro sequence-containing peptides tacking the NH group which directly follows the Pro residue available for intramolecular hydrogen bonding.
The invention provides compounds of formula (I): Said compounds being inhibitors of Kv3 channels and of use in the prophylaxis or treatment of related disorders.
The invention provides a compound of formula (Ia), and pharmaceutically acceptable salts thereof. The invention also provides use of the compounds or salts as modulators of Kv3.1 and/or Kv3.2, and in the treatment of diseases or disorders where a modulator of Kv3.1 and/or Kv3.2 is required, such as depression and mood disorders, hearing disorders, schizopherenea, substance abuse disorders, sleep disorders or epilepsy.
[EN] HYDANTOIN DERIVATIVES USEFUL AS KV3 INHIBITORS<br/>[FR] DÉRIVÉS D'HYDANTOÏNE UTILES EN TANT QU'INHIBITEURS DE KV3
申请人:AUTIFONY THERAPEUTICS LTD
公开号:WO2012076877A1
公开(公告)日:2012-06-14
The invention provides compounds of formula (I): Said compounds being inhibitors of Kv3 channels and of use in the prophylaxis or treatment of related disorders.
该发明提供了化合物的公式(I):所述化合物是Kv3通道的抑制剂,可用于预防或治疗相关疾病。
[EN] HYDANTOIN DERIVATIVES USEFUL AS KV3 INHIBITORS<br/>[FR] DÉRIVÉS D'HYDANTOÏNE UTILES COMME INHIBITEURS DE KV3
申请人:AUTIFONY THERAPEUTICS LTD
公开号:WO2013083994A1
公开(公告)日:2013-06-13
The invention provides compounds of formula (I): Said compounds being modulators of Kv3 channels and of use in the prophylaxis or treatment of related disorders.
该发明提供了化合物的公式(I):所述化合物是Kv3通道的调节剂,并用于预防或治疗相关疾病。
NOVEL COMPOUNDS
申请人:AUTIFONY THERAPEUTICS LIMITED
公开号:US20140323508A1
公开(公告)日:2014-10-30
The invention provides compounds of formula (I): Said compounds being modulators of Kv3 channels and of use in the prophylaxis or treatment of related disorders.