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Spensley, Mark,Kim, Jae-Yean,Picot, Emma,Reid, John,Ott, Sascha,Helliwell, Chris,Carré,, Isabelle A American Society of Plant Physiologists 2009 The Plant cell Vol.21 No.9
<P>The transcriptional regulation of the LATE ELONGATED HYPOCOTYL (LHY) gene is key to the structure of the circadian oscillator, integrating information from multiple regulatory pathways. We identified a minimal region of the LHY promoter that was sufficient for rhythmic expression. Another upstream sequence was also required for appropriate waveform of transcription and for maximum amplitude of oscillations under both diurnal and free-running conditions. We showed that two classes of protein complexes interact with a G-box and with novel 5A motifs; mutation of these sites reduced the amplitude of oscillation and broadened the peak of expression. A genome-wide bioinformatic analysis showed that these sites were enriched in phase-specific clusters of rhythmically expressed genes. Comparative genomic analyses showed that these motifs were conserved in orthologous promoters from several species. A position-specific scoring matrix for the 5A sites suggested similarity to CArG boxes, which are recognized by MADS box transcription factors. In support of this, the FLOWERING LOCUS C (FLC) protein was shown to interact with the LHY promoter in planta. This suggests a mechanism by which FLC might affect circadian period.</P>
Mijanuddin, Md.,Jana, Atish Dipankar,Drew, Michael G.B.,Hong, Chang Seop,Chattopadhyay, Basab,Mukherjee, Monika,Nandi, Mahasweta,Bhaumik, Asim,Helliwell, Madeline,Mostafa, Golam,Ali, Mahammad Elsevier 2009 Polyhedron Vol.28 No.4
<P><B>Graphical abstract</B></P><P>Two concomitant polymorphic coordination complexes (<B>I</B> and <B>II</B>) have been characterized crystallographically. Complex <B>I</B> shows the presence of a strong antiferromagnetic interaction and good catalytic efficiency in the liquid phase partial oxidation of olefins when immobilized on 2D-hexagonal mesoporous silica.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>Two concomitant polymorphic coordination complexes (dark blue – <B>I</B> and black – <B>II</B>) with the formula (Cu<SUB>2</SUB>C<SUB>44</SUB>H<SUB>60</SUB>N<SUB>4</SUB>O<SUB>4</SUB>) have been synthesized and characterized crystallographically. Magnetic measurements show the presence of a strong antiferromagnetic interaction and the 2<I>J</I> value corresponds extremely well to the theoretically calculated one, indicating the fact that it follows nicely the magneto-structural relationship. Immobilization of the copper(II) complex <B>1</B> on a 2D-hexagonal mesoporous silica showed good catalytic efficiency in the liquid phase partial oxidation of olefins in the presence of TBHP as an oxidant.</P>