Non coded C alpha, alpha-disubstituted amino acids. X-ray diffraction analysis of a dipeptide containing (S)-alpha-methylserine(454 views) Pavone V, Di Blasio B, Lombardi A, Maglio O, Isernia C, Pedone C, Benedetti E, Altmann E, Mutter M
Int J Pept Protein Res (ISSN: 0367-8377, 0367-8377print, 0367-8377linking), 1993 Jan; 41(1): 15-20.
Keywords: Alpha Methylserine, Dipeptide, Unclassified Drug, Article, Crystal Structure, Nonhuman, Protein Structure, X Ray Analysis, Crystallization, Hydrogen Bonding, Isomerism, Models, Molecular, Molecular Conformation, Support, Non-U S Gov, X-Ray Diffraction, Chemistry, Analogs, Derivatives,
Affiliations: Biocrystallographic Ctr. of the CNR, Department of Chemistry, University of Naples, Via Mezzocannone 4, 80134 Naples, Italy
References: Not available.
Non coded C alpha, alpha-disubstituted amino acids. X-ray diffraction analysis of a dipeptide containing (S)-alpha-methylserine
The crystal and molecular structure of the fully protected dipeptide Boc-Val-(S)-alpha-MeSer-OMe has been determined by X-ray diffraction techniques. Crystals grown from ethyl acetate/n-pentane mixtures are tetragonal, space group I4(1), with cell parameters at 295 K of a = 15.307(2), c = 18.937(10)A, V = 4437.1A3, M.W. = 332.40, Z = 8, Dm = 0.99 g/cm3 and Dx = 0.995 g/cm3. The structure was solved by application of direct methods and refined to an R value of 0.028 for 1773 reflections with I > or = 3 sigma (I) collected on a CAD-4 diffractometer. Both chiral centers have the (S) configuration. The dipeptide assumes in the solid state an S shape. The urethane moiety is in the cis conformation, while the amide bond is in the common trans conformation. The conformational angles phi 1, psi 1 of the Val and phi 2, and psi 2 of the (S)-alpha MeSer fall in the F region of the phi-psi map. The isopropyl side chain of the Val residue has the (t, g-) conformation, while the Ser side chain has a g+ conformation. The hydrogen bond donor groups are all involved in intermolecular H-bond interactions. Along the quaternary axis the dipeptide molecules are linked to each other with the formation of infinite rows.
Non coded C alpha, alpha-disubstituted amino acids. X-ray diffraction analysis of a dipeptide containing (S)-alpha-methylserine
Petraglia F, Singh AA, Carafa V, Nebbioso A, Conte M, Scisciola L, Valente S, Baldi A, Mandoli A, Petrizzi VB, Ingenito C, De Falco S, Cicatiello V, Apicella I, Janssen-megens EM, Kim B, Yi G, Logie C, Heath S, Ruvo M, Wierenga ATJ, Flicek P, Yaspo ML, Della Valle V, Bernard O, Tomassi S, Novellino E, Feoli A, Sbardella G, Gut I, Vellenga E, Stunnenberg HG, Mai A, Martens JHA, Altucci L * Combined HAT/EZH2 modulation leads to cancer-selective cell death(433 views) Oncotarget (ISSN: 1949-2553electronic, 1949-2553linking), 2018 May 22; 9(39): 25630-25646. Impact Factor:5.008 ViewExport to BibTeXExport to EndNote