Plantae/plants vascular

Bjorkman, O. Demmig, B. (1987). Photon yield of oxygen evolution and chlorophyll fluorescence characteristics at 77 K among vascular plants of diverse origins. Planta, 170, 489-504. 

Barsby RWJ, Salan U, Knight DW, Hoult JRS. Feverfew and vascular smooth muscle extracts from fresh and dried plants show opposing pharmacological profiles, dependent upon sesquiterpene lactone content. Planta Med 1993 59 20-25. 

The presumed primary determinant of which pathway is used for Phe (1) biosynthesis in planta is the substrate specificity of the dehydratase(s) for prephenate (38) or arogenate (41) conversion into phenylpyruvic acid (39) or Phe (1), respectively (Figure 6). Initially, vascular plants were assumed to have dehydratases similar to those in microorganisms, and these were therefore thought to employ a PDT (EC 4.2.1.51) to afford phenylpyruvate... 

The results of numerous studies have established that RG-II is present in the primary wall predominantly as a dimer that is cross-linked by a 1 2 borate-diol ester [11, 12]. A single borate ester cross-links two of the four apiosyl residues present in the dimer ([52] see Figure 5B). In vitro studies have shown that in the presence of boric acid and certain cations, two RG-II monomers rapidly self-assemble to form a dimer [52]. Moreover, the structure of RG-II itself may determine the location of the borate ester, since the location of the cross-link is the same in naturally occurring and in vitro-formed dimers. Thus, RG-II is the first example of a plant cell wall pectic polysaccharide that self-assembles to form structurally identical dimers [52]. The specificity and cation-dependence of this cross-linking suggest that there are distinct structural requirements for dimer formation and this may explain why the structure of RG-II is highly conserved in vascular plants [12, 53]. It is not known whether dimer formation in planta results from spontaneous self-assembly or is an enzymically catalyzed process. 

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