نتایج جستجو برای: structure function
تعداد نتایج: 2548874 فیلتر نتایج به سال:
Alexander S. Mankin C enter for Pharmaceutical Biotechnology, University of Illinois at C hicago, C hicago, IL 60607, USA ABSTRACT The ribosomal peptidyl transferase center (PTC) resides in the large ribosomal subunit and catalyzes the two principal chemical reactions of protein synthesis: peptide bond formation and peptide release. The catalytic mechanisms employed and their inhibition by anti...
The earliest land plants were short, herbaceous plants that evolved from primitive, water-living ancestors. For these plants, the change from a predominantly aquatic to a terrestrial environment was accompanied by the need for additional structural support to keep the plants upright and the need for more efficient transport of water to the aboveground parts of the plants. Larger plant sizes als...
The structure of dynein isolated from several sources follows the pattern first observed with Tetrahymena 22 S dynein, which has three globular heads attached by three flexible strands to a root-like base. Recent biochemical data indicate that there is one ATPase site on each dynein head and that all three heads interact with microtubules in an ATP-sensitive manner. Accordingly, images of dynei...
The development of vascular tissueswas prerequisite to the evolution of land plants, allowing for the division of labour between different organs. Instead of the entire plant body, the roots alone became specialized for the uptake of water and nutrients. The aerial organs diversified into stems, leaves andflowers. Photosynthesis shifted increasingly into leaves, expanding the light-exposed area...
the two symbols of abel and cain are of the important elements in badr shākir al-sayyāb’s poetry; so their traces could be explicitly perceived in his various poems. to be considered that the structure of each poem is formed by its components, cain and abel have prominent functions in the structure of poems these two poetical devices have been used in. on the one hand, the functions of these tw...
It is now widely recognized that the packaging of genomic DNA, together with core histones, linker histones, and other functional proteins into chromatin profoundly influences nuclear processes such as transcription, replication, DNA repair, and recombination. How chromatin structure modulates the expression of knowledge encoded in eukaryotic genomes, and how these processes take place within t...
The proposal of a double-helical structure for DNA over 60 years ago provided an eminently satisfying explanation for the heritability of genetic information. But why is DNA, and not RNA, now the dominant biological information store? We argue that, in addition to its coding function, the ability of DNA, unlike RNA, to adopt a B-DNA structure confers advantages both for information accessibilit...
Journal of Lipid Research Volume 53, 2012 1783 Copyright © 2012 by the American Society for Biochemistry and Molecular Biology, Inc. removal of excess cholesterol from macrophages in the arterial wall and subsequent delivery to the liver for biliary excretion. Interest in the enzyme increased even further when in 1967 the fi rst family with three sisters with familial LCAT defi ciency was descr...
Pre-mRNA splicing is catalyzed by the spliceosome, a multimegadalton ribonucleoprotein (RNP) complex comprised of five snRNPs and numerous proteins. Intricate RNA-RNA and RNP networks, which serve to align the reactive groups of the pre-mRNA for catalysis, are formed and repeatedly rearranged during spliceosome assembly and catalysis. Both the conformation and composition of the spliceosome are...
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