Detail of "6665-86-7"

Reference

Diverse signal sensitivity of NodD protein homologs from narrow and broad host range rhizobia

Diverse signal sensitivity of NodD protein homologs from narrow and broad host range rhizobia. Gyorgypal, Zoltan; Kondorosi, Eva; Kondorosi, Adam (Inst. Genet., Hung. Acad. Sci., Szeged H-6701, Hung.). Mol. Plant-Microbe Interact., 4(4), 356-64 (English) 1991. CODEN: MPMIEL. ISSN: 0894-0282. DOCUMENT TYPE: Journal CA Section: 10 (Microbial, Algal, and Fungal Biochemistry) Section cross-reference(s): 11 The narrow host range plant endosymbiont Rhizobium meliloti exhibited diverse symbiotic properties (nodulation, N2 fixation) in concert with 10 host plant species from the genera Medicago, Melilotus, and Trigonella. These plant species released divergent but overlapping sets of compds. from their seeds. Several constituents of the plant exudates exerted inductive or inhibitory effects on nodulation gene expression in R. 6665-86-7 and 491-80-5 which are cas registry numbers are also used here. meliloti, depending on the plasmid-borne NodD protein homolog (NodD1, NodD2, and NodD3 of R. meliloti) introduced into the test cell. These 3 types of NodD proteins, as well as NodD of the broad host range strain Rhizobium sp. MPIK3030 ,diverged in terms of specific recognition of flavonoid stds. The NodDMPIK3030 protein required only the hydroxylation of the C7 atom on the flavonoid ring for a substantial nodulation gene induction ability. Consequently, the NodDMPIK3030 protein was sensitive to a far broader range of flavonoids than either of 3 NodD homologs of R. meliloti which, in turn, required the appropriate constellation of addnl. substitutions on the flavonoid skeleton for effectivity. The aurone sulphuretin was an extremely potent inducer of nodulation genes even without plasmid-borne NodD in R. meliloti. Examn. of the effects of individual substitutions and different ring structures suggests that 7,3',4'-hydroxyflavone can be an ideal inducer of nodulation genes in R. meliloti. Thus the diverse signal sensitivity of NodD proteins correlates with the narrow or broad host range properties of the rhizobial strains. .

Correlations between high-performance liquid chromatographic retention, x-ray structural and carbon-13 NMR spectroscopic data of flavonoid compounds

Correlations between high-performance liquid chromatographic retention, x-ray structural and carbon-13 NMR spectroscopic data of flavonoid compounds. Pietrogrande, Maria Chiara; Reschiglian, Pierluigi; Dondi, Francesco; Kahie, Yassin Duale; Bertolasi, Valerio (Dep. Chem., Univ. Ferrara, Ferrara 44100, Italy). J. Chromatogr., 592(1-2), 65-73 (English) 1992. CODEN: JOCRAM. ISSN: 0021-9673. DOCUMENT TYPE: Journal CA Section: 9 (Biochemical Methods) Section cross-reference(s): 77 The retention behavior of selected flavonoid compds. was analyzed and correlated with structural properties, as elucidated by x-ray crystallog. and 13C NMR spectroscopic studies. A detailed anal. of group retention contribution (Dlog k') makes it possible to establish how the introduction of an OH group in the mol. affects the overall solute polarity and, therefore, its retention, in relation to the position of the OH group and the mol. environment. X-ray structural information and 13C NMR chem. shifts show the formation of strong intramol. H bonding (HB) in 5-hydroxyflavones and a weaker intramol. HB in 3-hydroxy-substituted compds. 6665-86-7 and 529-44-2 which are cas registry numbers of substances are two of reagents here. DLog k' values may be explained in terms of these intramol. HB properties; moreover, a quant. relation between Dlog k' values and chem. shifts was found. .