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슬라이드 1
슬라이드 1

... With the help of specially programmed supercomputers researchers can test new enzyme structures in a virtual environment. Even slight changes in an enzyme can result in amazing improvements in stability • An enzyme consists of several hundreds of amino acids located in a delicate threedimensional st ...
FREE Sample Here
FREE Sample Here

... forensic sciences. It would be interesting to share several murder cases with students that were solved with these techniques or to show how these techniques have cleared many convicted felons of their supposed crimes. ...
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... rescued by inserting a C. This rate is in general smaller than the base deletion rate. For codons with a vacant site, they also undergo insertions which randomly insert one of the four nucleotides (A,C,G,U) back into the vacant site with a mutation rate µe , which we take to be the same as the rando ...
Studies on the key amino acid residues responsible for the alkali
Studies on the key amino acid residues responsible for the alkali

... containing 20 kinds of different amino acids substitutions of Asn-71, the recombinant PCR reactions were carried out by using three pairs of primer (primers 1 and 4, primers 2 and 3, primers 1 and 2, respectively). The mutant fragments were then cloned into plasmid pUC19 and more than 300 recombinan ...
New techniques in plant biotechnology
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Gene Section MLL (myeloid/lymphoid or mixed lineage leukemia) Atlas of Genetics and Cytogenetics
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Enzyme
Enzyme

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MTHFr, Methylation and Metals

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Slayt 1 - Prof.Dr.Orhan CANBOLAT

... to the corresponding nucleotides IMP and GMP. • Inability to utilize PRPP in the salvage pathway leads to PRPP accumulation, which, in conjunction with low levels of IMP and GMP, causes chronic allosteric activation of PRPP glutamyl amidotransferase and excessive purine synthesis. • The excess purin ...
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... One of the most interesting discoveries of molecular biology is the nearuniversal nature of the genetic code. Although some organisms show slight variations in the amino acids assigned to particular codons, the code is always read three bases at a time and in the same direction. Despite their enormo ...
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Deoxyribozyme



Deoxyribozymes, also called DNA enzymes, DNAzymes, or catalytic DNA, are DNA oligonucleotides that are capable of catalyzing specific chemical reactions, similar to the action of other biological enzymes, such as proteins or ribozymes (enzymes composed of RNA).However, in contrast to the abundance of protein enzymes in biological systems and the discovery of biological ribozymes in the 1980s,there are no known naturally occurring deoxyribozymes.Deoxyribozymes should not be confused with DNA aptamers which are oligonucleotides that selectively bind a target ligand, but do not catalyze a subsequent chemical reaction.With the exception of ribozymes, nucleic acid molecules within cells primarily serve as storage of genetic information due to its ability to form complementary base pairs, which allows for high-fidelity copying and transfer of genetic information. In contrast, nucleic acid molecules are more limited in their catalytic ability, in comparison to protein enzymes, to just three types of interactions: hydrogen bonding, pi stacking, and metal-ion coordination. This is due to the limited number of functional groups of the nucleic acid monomers: while proteins are built from up to twenty different amino acids with various functional groups, nucleic acids are built from just four chemically similar nucleobases. In addition, DNA lacks the 2'-hydroxyl group found in RNA which limits the catalytic competency of deoxyribozymes even in comparison to ribozymes.In addition to the inherent inferiority of DNA catalytic activity, the apparent lack of naturally occurring deoxyribozymes may also be due to the primarily double-stranded conformation of DNA in biological systems which would limit its physical flexibility and ability to form tertiary structures, and so would drastically limit the ability of double-stranded DNA to act as a catalyst; though there are a few known instances of biological single-stranded DNA such as multicopy single-stranded DNA (msDNA), certain viral genomes, and the replication fork formed during DNA replication. Further structural differences between DNA and RNA may also play a role in the lack of biological deoxyribozymes, such as the additional methyl group of the DNA base thymidine compared to the RNA base uracil or the tendency of DNA to adopt the B-form helix while RNA tends to adopt the A-form helix. However, it has also been shown that DNA can form structures that RNA cannot, which suggests that, though there are differences in structures that each can form, neither is inherently more or less catalytic due to their possible structural motifs.
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