Unusual enzymes
نویسندگان
چکیده
منابع مشابه
Biosynthetic enzymes of unusual microbial sugars.
The biological importance of proteins and nucleic acids in the natural world is undeniable, and research efforts on these macromolecules have often overshadowed those directed at carbohydrates. It is now known, however, that carbohydrates not only play roles in energy storage and plant cell wall structure, but are also intimately involved in such processes as fertilization, the immune response,...
متن کامل1 Unusual Cytochrome P 450 Enzymes and Reactions
Cytochrome P450 (P450) enzymes primarily catalyze mixed-function oxidation reactions, plus some reductions and rearrangements of oxygenated species, e.g. prostaglandins. Most of these reactions can be rationalized in a paradigm involving Compound I, a high-valent iron-oxygen complex (FeO), to explain seemingly unusual reactions including ring couplings, ring expansion and contraction, and fusio...
متن کاملUnusual evolution of a catalytic core element in CCA-adding enzymes
CCA-adding enzymes are polymerases existing in two distinct enzyme classes that both synthesize the C-C-A triplet at tRNA 3'-ends. Class II enzymes (found in bacteria and eukaryotes) carry a flexible loop in their catalytic core required for switching the specificity of the nucleotide binding pocket from CTP- to ATP-recognition. Despite this important function, the loop sequence varies strongly...
متن کاملThe Unusual Resistance of Avian Defensin AvBD7 to Proteolytic Enzymes Preserves Its Antibacterial Activity
Defensins are frontline peptides of mucosal immunity in the animal kingdom, including birds. Their resistance to proteolysis and their ensuing ability to maintain antimicrobial potential remains questionable and was therefore investigated. We have shown by bottom-up mass spectrometry analysis of protein extracts that both avian beta-defensins AvBD2 and AvBD7 were ubiquitously distributed along ...
متن کاملCarnivorous Nutrition in Pitcher Plants (Nepenthes spp.) via an Unusual Complement of Endogenous Enzymes.
Plants belonging to the genus Nepenthes are carnivorous, using specialized pitfall traps called "pitchers" that attract, capture, and digest insects as a primary source of nutrients. We have used RNA sequencing to generate a cDNA library from the Nepenthes pitchers and applied it to mass spectrometry-based identification of the enzymes secreted into the pitcher fluid using a nonspecific digesti...
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ژورنال
عنوان ژورنال: Nature
سال: 1985
ISSN: 0028-0836,1476-4687
DOI: 10.1038/313165c0