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Structure of cyclo(-L-leucyl-L-tyrosyl-) monohydrate, $C_{15}H_{20}N_2O_3.H_2O$

Suguna, K and Ramakumar, S and Kopple, KD (1984) Structure of cyclo(-L-leucyl-L-tyrosyl-) monohydrate, $C_{15}H_{20}N_2O_3.H_2O$. In: Acta Crystallographica - C, 40 (12). pp. 2053-2056.

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Abstract

$M_r = 294.3$, monoclinic, $P2_1$, a = 8.883 (5), b = 6. 105 (3), c = 14.582 (5) \AA, \beta= 99.53 (4)°, U= 779.9 ${\AA}^3$, Z = 2, $D_m = 1.25$, $D_x = 1.25 Mg m^{-3}$, \lambda(Cu Ka) = 1.5418 \AA, $\mu = 0.666 mm^{-1}$, F(000) = 316, room temperature, R =0.075 for 1147 significant reflections. One of the cis peptide units shows significant non-planarity with \omega =-11.7 (10)°, the other is planar with \omega =-2.8 (10)°. The diketopiperazine ring takes a boat form. The leucyl side chain is in an extended conformation $[X^2= 173.7 (7)°]$; the tyrosyl residue shows a folded geometry $[X^1 = 59.5 (7)°]$. $X^2$ of the tyrosyl side chain is 98.4 (8)°.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to International Union of Crystallography.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 25 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ernet.in/id/eprint/13481

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