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Topic: Ribonucleotides

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Purine

DNA

RNA polymerase

De novo

Law

	Ribonucleotide - Wikipedia, the free encyclopedia
		A ribonucleotide is a nucleotide in which a purine or pyrimidine base is linked to a ribose molecule.
		Ribonucleotides have one, two, or three phosphate groups attached to the ribose sugar.
		Ribonucleotides include adenosine triphosphate (ATP), which is the major source of energy for cell work.
	en.wikipedia.org /wiki/Ribonucleotide (149 words)

	[No title]
		The enzyme that is responsible for the conversion of ribonucleotides to deoxyribonucleotides.
		This is accomplished by the reduction of the 2'-hydroxyl of the ribonucleotide to hydrogen.
		A monophosphorylated derivative of ribose, ribose 5-phosphate is a precursor of ribonucleotides.
	guweb2.gonzaga.edu /faculty/cronk/biochem/R-index.cfm?definition=R (1114 words)

	Position-specific effect of ribonucleotides on the cleavage activity of human topoisomerase II -- Wang et al. 28 (24): ...
		The cold competitor used in the experiment was either the control DNA substrate (lanes 1–3), the substrate containing a ribonucleotide at the +1 position (lanes 4–6) or the substrate containing a ribonucleotide at the –2 position (lanes 7–9) as indicated.
		that the presence of a ribonucleotide in one of the strands
		Substrates harbouring a ribonucleotide in either one or both strands were incubated with human topoisomerase II as described in Materials and Methods and the SDS-stopped samples were analyzed on an 8% SDS–polyacrylamide gel.
	nar.oxfordjournals.org /cgi/content/full/28/24/4815 (4505 words)

	In the Simian Virus 40 In Vitro Replication System, Start Site Selection by the Polymerase {alpha}-Primase Complex Is ...
		presence of the alleged in vivo concentrations of ribonucleotides.
		The samples were then boiled for 4 min in a 90% formamide loading buffer (60) and applied to a 10% denaturing polyacrylamide gel.
		Reactions performed with primer-RNA/DNA molecules formed using standard ribonucleotide concentrations are presented in lanes 1 and 2; those formed under high ribonucleotide concentrations are presented in lanes 3 and 4.
	jvi.asm.org /cgi/content/full/75/14/6392 (6468 words)

	Nucleic Acids (Site not responding. Last check: 2007-10-19)
		Are either ribonucleotides or deoxyribonucleotides depending on whether they are used in the synthesis of DNA or in the synthesis of RNA, respectively.
		Ribonucleotides or deoxyribonucleotides are distinguishable by their 5-carbon sugars.
		ATP consists of the ribonucleotide adenine to which two additional phosphate groups have been added to the one already present.
	www.mansfield.ohio-state.edu /~sabedon/biol1040.htm (2030 words)

	Isolation of the Gene for the B12-Dependent Ribonucleotide Reductase from Anabaena sp. Strain PCC 7120 and Expression ...
		Isolation of the Gene for the B12-Dependent Ribonucleotide Reductase from Anabaena sp.
		The gene for ribonucleotide reductase from Anabaena sp.
		Adenosylcobalamin-dependent ribonucleotide reductase from the blue-green alga, Anabaena sp.
	jb.asm.org /cgi/content/full/184/23/6544 (3511 words)

	Transcription (Site not responding. Last check: 2007-10-19)
		New ribonucleotides are added to the chain at a rate of 50 per second.
		Sometimes mistakes are made and the wrong ribonucleotide will pair up with one of the nucleotides of the DNA strand.
		The phosphate group on the end of it leaves and the end that is left attacks the innermost phosphate of a GTP molecule and forms a bond with it.
	www.scienceden.com /mbiology/concepts/transcription (1480 words)

	DNA Amplifications Utilizing Unnatural Base-Pairs and a DNA/RNA Polymerase
		For example polynucleotide sequences could be detected, or one or more nucleotides thereof could be sequenced utilizing cycling probes (primer precursors), or cyclizable (ligatable) linear probes; either being comprised of one one or more unnatural base-pairing nucleotides and perhaps a mixture of naturally base-pairing nucleotides.
		As far as I'm aware, this is the first example of a polynucleotide comprising both deoxyribonucleotides and ribonucleotides, wherein at least one nucleotide is an unnaturally base-pairing nucleotide.
		The incorporated ribonucleotide is then the target of a ribonuclease, either while duplex (RNase H) or after displacement (single-stranded dependent RNase).
	www.wbabin.net /saba/saba18.htm (969 words)

	BioCarta - Charting Pathways of Life
		The pyrimidine ribonucleotides, those found in RNA, are uracil and cytosine, each containing the sugar ribose and a nitrogenous base.
		The deoxyribonucleotides found in DNA are synthesized through reduction of the ribose ring in ribonucleotides.
		Multifunctional enzyme complexes of this nature occur in other pathways as well, and increase the overall efficiency of a pathway by directing pathway intermediates directly from one step to the next rather than relying on diffusion between enzymes in the pathway.
	www.biocarta.com /pathfiles/pyrimidinePathway.asp (280 words)

	Transcription
		(def), messenger RNA (mRNA) (def) is synthesized by complementary base pairing (def) of ribonucleotides (def) with deoxyribonucleotides (def) to match a portion of one strand of DNA called a gene (def).
		Once the actual transcription begins, ribonucleotides containing 3 phosphate groups hydrogen bond through the process of complementary base (def) pairing with the exposed deoxyribonucleotides on the unwound strand that is to be transcribed (see Fig.
		Once the actual transcription begins, ribonucleotides containing 3 phosphate groups form hydrogen bonds through the process of complementary base (def) pairing with the exposed deoxyribonucleotides on the unwound strand that is to be transcribed.
	student.ccbcmd.edu /biotutorials/protsyn/tsc.html (1066 words)

	Creation Explanation 4j
		The RNA molecule is a chain of ribonucleotides very similar to the deoxyribonucleotides of DNA, except that for the sugar deoxyribose is substituted ribose, and uridine is substituted for thymidine.
		Hydrogen bonded pairs are formed between the deoxyribonucleotides of the DNA template and free ribonucleotides which are to be bonded together to form a complementary RNA chain.
		The result is an RNA chain whose nucleotides are complementary to the nucleotides in the DNA template chain or gene.
	www.parentcompany.com /creation_explanation/cx4j.htm (564 words)

	Urszula
		The other way to produce dNTPs is through the de novo pathway where ribonucleotides (the precursors of RNA) are reduced to form deoxyribonucleotides.
		RNR reduces all the four main ribonucleotides to the corresponding deoxyribonucleotides, thus it is an essential enzyme in DNA synthesis and indispensable for survival of all living organisms.
		The reaction catalysed by RNR is a chemically complexed reaction performed with help of organic free redicals, which are stored by the enzyme until needed.
	xray.bmc.uu.se /~urszula/project.htm (580 words)

	Polymerase Mu Is a DNA-Directed DNA/RNA Polymerase -- Nick McElhinny and Ramsden 23 (7): 2309 -- Molecular and Cellular ...
		of the ribonucleotide to cleave the adjacent phosphodiester
		Enzymic synthesis of ribonucleotide terminated oligodeoxynucleotides and their use as primers for the enzymic synthesis of polydeoxynucleotides.
		Excision of misincorporated ribonucleotides in DNA by RNase H (type 2) and FEN-1 in cell-free extracts.
	mcb.asm.org /cgi/content/full/23/7/2309 (4470 words)

	Rna \| Macmillan Genetics
		Ribonucleic acid (RNA) molecules, which are linear chains (or polymers) of ribonucleotides, perform a number of critical functions.
		Ribonucleotides, the building blocks of RNA, are molecules that consist of a nitrogen-containing base, a phosphate group, and ribose, a five-carbon sugar.
		The order of ribonucleotides that are assembled to form the RNA molecule is determined by the order of the deoxyribonucleotides in the DNA strand.
	www.bookrags.com /research/rna-gen-04 (1861 words)

	RIBO1 (Site not responding. Last check: 2007-10-19)
		Ribonucleotides are not permitted in foods intended specifically for infants and young children, and people who must avoid purines for conditions such as gout are advised to avoid these additives.
		Reactions to ribonucleotides are difficult to identify because they are not a true allergy.
		Although this sounds reasonable, unfortunately, the majority of people who are affected by ribonucleotides - and their health advisors - don't realise the cause of their problem and therefore can't choose to avoid them.
	www.fedupwithfoodadditives.info /factsheets/635/RIBO1.htm (5444 words)

	Purine and Pyrimidine Metabolism
		Either the di- or triphosphate forms of the ribonucleotides can be used as substrates by this enzyme.
		Deoxyribonucleotides are synthesized by reduction of the corresponding ribonucleotides.
		Deoxyribonucleotides are synthesized from ribonucleotides by the enzyme ribonucleotide reductase
	www.db.uth.tmc.edu /faculty/alevine/1521_2000/deoxyribo.htm (1174 words)

	Effect of Dietary Ribonucleotides on Infant Immune Status. Part 1: Humoral Responses -- SCHALLER et al. 56 (6): 883 -- ... (Site not responding. Last check: 2007-10-19)
		Ribonucleotides are found in human milk (18,19) and are at much
		ribonucleotide effects on the immune status of infants.
		ribonucleotides were fed for the duration of the study, the
	www.pedresearch.org /cgi/content/full/56/6/883 (5140 words)

	[No title]
		TranslationLab is a web exercise that will allow you to study the importance of the nucleotide sequence of mRNA as the fundamental basis for the genetic code universally deciphered by living cells.
		You will produce sequences of ribonucleotides that will be translated into protein to simulate the landmark experiments involving cell-free extracts that were essential for interpreting and understanding the genetic code.
		For each of the four bottles of ribonucleotides that appear, click on the arrow to select a nucleotide.
	facstaff.uww.edu /mckinnoj/Bio1WebDNA.doc (2422 words)

	Translation
		The ribonucleotide sequence the ribosome is looking for on the RNA strand is AUG (adenine, uracil, guanine).
		The elongation phase starts when the anticodon of another tRNA molecule is able to form base pairs with the next three ribonucleotides that come after the AUG. Each group of three ribonucleotides on the strand of RNA is called a codon.
		After this first peptide bond is formed, the ribosome slides down three ribonucleotides to the next codon on the RNA molecule.
	www.scienceden.com /mbiology/concepts/translation (580 words)

	Conferring RNA polymerase Activity to a DNA polymerase: A single residue in reverse transcriptase controls ...
		Both incorporation and extension of incorporated ribonucleotides by RT-F155V-H are slower than for deoxyribonucleotides.
		uses deoxyribonucleotides as opposed to ribonucleotides as substrates.
		of ribonucleotides, which might be lethal to organisms.
	www.pnas.org /cgi/content/full/94/2/407 (3520 words)

	Novel mechanism for the impairment of cell proliferation in HIV-1 infection. (Site not responding. Last check: 2007-10-19)
		The synthesis of ribonucleotides is essential to cell proliferation.
		Defects in the relevant metabolic pathways have been demonstrated in stimulated T cells from AIDS patients and are associated with lymphocyte necrotic death.
		Here, Margarita Bofill and colleagues discuss the possibility that an impaired ribonucleotide metabolism might be common to all rapidly dividing cells and thus contribute to other recognized symptoms of HIV-1 infection.
	www.aegis.com /aidsline/1999/sep/A9991369.html (321 words)

	Effect of Dietary Ribonucleotides on Infant Immune Status. Part 2: Immune Cell Development -- BUCK et al. 56 (6): 891 ... (Site not responding. Last check: 2007-10-19)
		Effect of Dietary Ribonucleotides on Infant Immune Status.
		ribonucleotides alter immune cell phenotypes or function in
		J. BAGGS, and J. Effect of Dietary Ribonucleotides on Infant Immune Status.
	www.pedresearch.org /cgi/content/abstract/56/6/891 (304 words)

	Boron
		Two compounds have this structure physiologically: ribose in ribonucleotides and RNA, and apiose in the plant cell wall.
		We postulate that borate-apiofuranose ester cross-links are the auxin-sensitive acid-growth link in vascular plants, that the cyanobacterial heterocyst envelope depends on borate cross-linking of mannopyranose and/or galactopyranose residues in a polysaccharide-lipid environment, and that boron in diatoms forms ester cross-links in the polysaccharide cell wall matrix rather than boron-silicon interactions.
		Complexing of ribonucleotides is probably a factor in boron toxicity.
	www.ithyroid.com /boron.htm (3385 words)

	Nucleotides
		The key molecule in the synthesis of the pyrimidine ribonucleotides is uridine monophosphate (UMP), as it is the final product of the six-step synthesis pathway and from which CTP is subsequently derived.
		With the exception of the discussions of purine and pyrimidine nucleotide degradation, which are generalized to ribonucleotides and deoxyribonucleotides, the biosynthetic pathways that we have looked at were specific to ribonucleotides and, therefore, to RNA.
		Thioredoxin is a physiologic reducing agent of ribonucleotide reductase and its pair of Cys residues can swap H atoms with the disulfide formed, thus regenerating the original enzyme.
	www.rpi.edu /dept/bcbp/molbiochem/BiochSci/sbello/nucleotides.htm (4977 words)

	DISCUSSION (Site not responding. Last check: 2007-10-19)
		Starting at the 3' end of the sense strand, complementary ribonucleotides are brought in.
		The first ribonucleotide establishes the 5' end of the RNA, and the RNA then grows from its 5' end to its 3' end.
		As the gene is transcribed, the hydrogen bonds holding the ribonucleotides to the sense strand break allowing the RNA to move off the DNA.
	glory.gc.maricopa.edu /~bcooper/TranscriptionDis2.htm (238 words)

	Role of Calf RTH-1 Nuclease in Removal of 5'-Ribonucleotides during Okazaki Fragment Processing
		The role of the exonucleolytic activity of the calf 5' to 3' exo/endonuclease, a RAD2 homolog 1 (RTH-1) class nuclease, in lagging-strand DNA replication has been examined using model Okazaki fragment substrates.
		These substrates exemplify the situation in Okazaki fragment processing which occurs after the initiator RNA primer is cleaved off, and released intact, by calf RNase HI, leaving a single ribonucleotide at the 5' end of the RNA-DNA junction.
		Results with various sequences indicated that the upstream primer is generally inhibitory for ribonucleotide removal but is sometimes neutral.
	pubs.acs.org /cgi-bin/abstract.cgi/bichaw/1996/35/i28/abs/bi9603074.html (333 words)

	Terminal Deoxynucleotidyl Transferase Indiscriminately Incorporates Ribonucleotides and Deoxyribonucleotides -- ...
		Aliquots of the reactions were taken at 15, 30, 45, and 60 s and analyzed on a 16% polyacrylamide denaturing gel.
		The value of the selectivity factor for deoxyribonucleotide over ribonucleotide is given for each of the four couples above the corresponding migration pattern (see "Experimental Procedures" for details).
		Polymerization products obtained with the three other conventional ribonucleotides, individually or in the presence of the homologous deoxyribonucleotide, are displayed in B and C respectively.
	www.jbc.org /cgi/content/full/276/33/31388 (3368 words)

	Multiple Amino Acid Substitutions Allow DNA Polymerases to Synthesize RNA -- Patel and Loeb 275 (51): 40266 -- Journal ...
		Barriers for WT Taq pol I to Incorporate Ribonucleotides-- We measured the capacity of several subclasses of DNA polymerases to incorporate ribonucleotide triphosphates relative to
		There are no steric conflicts when a dNTP (or ddNTP) binds to WT Taq pol I; however, the 2'-OH group of an rNTP occupies the same space as the Glu-615 residue, thus inhibiting ribonucleotide incorporation.
		Secondly, modeling of substitutions of Ile-614 to a variety of amino acids that allow ribonucleotide binding and incorporation shows that the junction at which this residue resides tends to move away from the bound nucleotide, thus making space for the 2'-OH group.
	www.jbc.org /cgi/content/full/275/51/40266 (4446 words)

	Bioc 811
		As we discussed in the section on ribonucleotide reductase, there are three very different enzymes that use different cofactors to catalyze this important reaction, removal of the 2' OH group from ribonucleotides.
		The fact that there are de novo pathways for ribonucleotides but not for deoxyribonucleotides (they are only made from ribonucleotides) suggests that DNA came after RNA in evolution.
		The answer seems to be that protein came next because protein catalysts are apparently necessary to make ribonucleotide reduction possible and this had to happen before DNA was ever made.
	drnelson.utmem.edu /evolution2.2002.html (5559 words)

	Expression of the pyrG gene determines the pool sizes of CTP and dCTP in Lactococcus lactis -- Jørgensen et al. ... (Site not responding. Last check: 2007-10-19)
		ribonucleotides and DNA replication is dependent on deoxyribonucleotides.
		Ribonucleotide pool sizes in the reference strain CJ233 are shown by horizontal stippled lines.
		dCTP is synthesized from CTP by a reaction catalyzed by ribonucleotide
	content.febsjournal.org /cgi/content/full/271/12/2438 (4550 words)

	BioMed Central \| Full text \| Redesigned and chemically-modified hammerhead ribozymes with improved activity and serum ...
		One of the difficulties associated with delivering preformed ribozymes is their instability in vivo, since RNA is degraded very rapidly by ribonucleases present in cells and extracellular fluids.
		Significant segments of ribonucleotides in the hammerhead ribozyme can be replaced with more nuclease-resistant analogues like DNA, phosphorothioate linkages, or 2' O-methyl analogues; however, within the conserved core of the hammerhead, the majority of ribonucleotides are sensitive to modification.
		P label appearing in the gel lanes remained relatively constant throughout the experiment implying a lack of significant phosphatase activity in the serum.
	www.biomedcentral.com /1472-6769/4/1 (5082 words)

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