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Among the structural polymers present in the plant cell wall, pectin is the main component of the middle lamella. This heterogeneous polysaccharide has an α-1,4 galacturonic acid backbone, which can be broken by the enzymatic action of pectinases, such as exo-polygalacturonases, that sequentially cleave pectin from the non-reducing ends, releasing mono or di-galacturonic acid residues. Constant demand for pectinases that better suit industrial requirements has motivated identification and characterization of novel enzymes from diverse sources. Bacillus licheniformis has been used as an important source for bioprospection of several industrial biomolecules, such as surfactants and enzymes, including pectate lyases. Here we cloned, expressed, purified, and biochemically and structurally characterized an exo-polygalacturonase from B.
If heated, however, such materials lose their natural magnetization at a given temperature, called critical temperature T
In this chapter we study mixtures of two components, called binary mixtures which are quite common in nature, both the homogeneous and heterogeneous.
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The inhibitory activity of CNF is most likely associated with this oligomeric conformation. In addition, we suggest that the CNF tetramer has a spherical shape and that tyrosinyl residues could play an important role in the oligomerization. The carbohydrate moiety, which is present in most sbγPLIs, is not essential for the inhibitory activity, oligomerization or complex formation of the CNF with the target PLA2. A minor component, comprising no more than 16% of the sample, was identified in the CNF preparations. The amino-terminal sequence of that component is similar to the B subunits of the heteromeric sbγPLIs; however, the role played by such molecule in the functionality of the CNF, if any, remains to be determined.
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Several snake species possess endogenous phospholipase A2 inhibitors (sbPLIs) in their blood plasma, the primary role of which is protection against an eventual presence of toxic phospholipase A2 (PLA2) from their venom glands in the circulation. These inhibitors have an oligomeric structure of three to six subunits and have been categorized into three classes (α, β and γ) based on their structural features. SbγPLIs have been further subdivided into two subclasses according to their hetero or homomeric nature, respectively. Despite the considerable number of sbγPLIs daniel dantas ator described, their structures and mechanisms of action are still not fully understood. In the present study, we focused on the native structure of CNF, a homomeric sbγPLI from Crotalus durissus terrificus, the South American rattlesnake. Based on the results of different biochemical and biophysical experiments, we concluded that, while the native inhibitor occurs as a mixture of oligomers, tetrameric arrangement appears to be the predominant quaternary structure.
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Our small angle X-ray scattering experiments show that LepFNR is a monomeric enzyme. Moreover, our biochemical data demonstrate that read more the LepFNR has an enzymatic activity similar to those reported for the plastidic enzymes and that is significantly different from bacterial flavoenzymes, which display lower turnover rates.
In this chapter we study systems governed by master equations and defined in a lattice. To each site of lattice there is a stochastic variable that takes only two values which we choose to be + 1 or − 1.