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Topic: Protein sequencing

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	Protein Sequencing and Identification Using Tandem Mass Spectrometry
		The remainder of the book is devoted to a series of chapters detailing the practical aspects of protein sequencing ranging from 2d-gel electrophoresis, sample preparation, the obtaining of the mass spectrum, protein identification by database searching, sequencing of novel peptides and characterisation of post-translational modifications.
		For example, detailed protocols are given for preparing a protein homogenate from cells for isoelectric focusing, for passive and active rehydration of immobilised pH-gradient gels, for preparation for analysis by SDS-PAGE, for staining of gels by Coomassie Blue or silver and for in-gel digestion of the selected protein.
		The use of various databases for protein identification is illustrated with several examples and strategies for the determination of structures of novel peptides are discussed and illustrated with further examples.
	www.spectroscopyeurope.com /bookprotseq.html (575 words)

	Protein Chemistry - Services
		Protein bands or spots to cut out from a gel should be accompanied with a scanned picture where the corresponding band/ spot is indicated.
		The main purpose of electroblotting of proteins at the Protein Chemistry Laboratory is to prepare electrophoretically separated proteins for N-terminal sequence analysis.
		Sequencing of proteins and peptides by Edman degradation
	www.biocenter.helsinki.fi /bi/protein/servcont.htm (3552 words)

	ALTERNATIVE STRATEGY TO SEQUENCING A PROTEIN
		Sequencing of a specific DNA fragment is extremely rapid and relatively inexpensive.
		Clones producing the protein of interest are detected after lysis and immobilization of macromolecules on a filter membrane, usually nitrocellulose.
		A short oligonucleotide (15 to 22 kbp) complementary to a region upstream of the DNA to be sequenced is used to prime DNA synthesis.
	www.richmond.edu /~jbell2/c5pt4.html (2724 words)

	Protein Chemistry
		Proteins transferred from SDS polyacrylamide gels to these matrices can be excised from a mixture of proteins and subjected directly to sequence analysis.
		The Protein Chemistry Laboratory also accepts samples from non-system sources and this year, as last, a relatively large number of samples originated out-of-system although we experienced a decrease in non-system users of the protein sequencing capabilities.
		Protein separations and digestions are performed in the Protein Chemistry Laboratory and the high-accuracy mass determinations are made in the Laboratory for Biological Mass Spectrometry.
	www.chem.tamu.edu /CCCA/report/PCL.htm (2967 words)

	Protein sequencing Summary
		Proteins begin to take on their characteristic three-dimensional shape even while they are being made, folding and twisting as each new amino acid added to the chain tugs or pushes at the others added before it.
		Sequencing a protein from its C-terminus is particularly challenging, and there are no techniques that are as robust as Edman degradation.
		Proteins are found in every cell and are essential to every biological process, protein structure is very complex: determining a protein's structure involves first protein sequencing - determining the amino acid sequences of its constituent peptides; and also determining what conformation it adopts and whether it is complexed with any non-peptide molecules.
	www.bookrags.com /Protein_sequencing (2664 words)

	Protein Sequencing by Adam Edwards
		Protein sequencing, the determination of the amino acid sequence of a peptide or protein, has come a long way since Dr. Frederick Sanger determined the structure of the protein insulin in 1953 (Finelli et.
		The purpose of protein sequencing is to provide information about the amino acid residues which make up a certain protein, more specifically their sequence (Perkin Elmer Guide 2).
		Basically, in protein sequencing amino acids are removed in a sequential and ordered manner from the amino-terminal (N-terminal) end of a protein strand and identified in order as they are removed (Perkin Elmer Guide 2).
	www.samford.edu /~gekeller/edwards.html (1489 words)

	Hartwell Center/Molecular Interaction/Protein Sequencing
		Advances in gene sequencing technology have made it easier to sequence the gene that codes for the protein rather than the protein itself.
		Currently, the main application of Edman sequencing is to determine where the protein starts compared to the translated gene sequence.
		The protein to be sequenced is attached to a solid support and placed in the instrument.
	www.hartwellcenter.org /bio_services/moleInter/proteinSeq.php (1158 words)

	W.M. Keck Facility at Yale - More Information on Protein Analysis Procedures
		The first is simply that several concentrations of a mixture of known proteins be run on the same gel as the sample and then the amount of protein in the sample estimated by comparison to these standards.
		Since proteins vary by at least twofold in their relative Coomassie Blue staining intensity it is important that more than one standard protein be run and that an "average" Coomassie Blue staining intensity for a given amount of standard protein be used to estimate the amount of protein in the unknown sample.
		Since this internal sequencing standard is composed of non-naturally occurring amino acids, it does not interfere with sequencing the unknown peptide/protein.
	info.med.yale.edu /wmkeck/prochem/procprot.htm (2161 words)

	Protein sequencing - Wikipedia, the free encyclopedia
		Proteins are found in every cell and are essential to every biological process, protein structure is very complex: determining a protein's structure involves first protein sequencing - determining the amino acid sequences of its constituent peptides; and also determining what conformation it adopts and whether it is complexed with any non-peptide molecules.
		The two major direct methods of protein sequencing are mass spectrometry and the Edman degradation reaction.
		The peptide to be sequenced is adsorbed onto a solid surface - one common substrate is glass fibre coated with polybrene, a cationic polymer.
	en.wikipedia.org /wiki/Protein_sequencing (1778 words)

	Protein (Site not responding. Last check: 2007-10-20)
		The Protein Sequencing/Peptide Synthesis Core Research Facility provides instrumental methods for the sequencing of proteins, the synthesis of peptides and purification of macromolecules.
		The Protein Core Research Facility is capable of elucidating the amino acid sequence of proteins in solution or blotted onto PVDF membranes, following gel electophoresis.
		In addition to the general technologies of protein sequencing and peptide synthesis, the Facility is also capable of obtaining internal peptides for sequencing.
	www.biotech.unl.edu /oldroot/protein.htm (366 words)

	Sequencing - Wikipedia, the free encyclopedia
		In genetics and biochemistry, sequencing means to determine the primary structure (or primary sequence) of an unbranched biopolymer.
		Sequencing results in a symbolic linear depiction known as a sequence which succinctly summarizes much of the atomic-level structure of the sequenced molecule.
		Determining part of a protein's amino-acid sequence (often one end) by one of the above methods may be sufficient to enable the identification of a clone carrying the gene.
	en.wikipedia.org /wiki/Sequencing (972 words)

	Peptide Sequencing
		In genetics and biochemistry, sequencing means to determine the primary structure (or primary sequence) of an unbranched biopolymer.
		Sequencing results in a symbolic linear depiction known as a sequence which succinctlysummarizes much of the atomic-level structure of the sequenced molecule.
		Though polysaccharides are also biopolymers, it is not so common totalk of 'sequencing' a polysaccharide, because a symbolic linear depiction cannot capture their tendency to branch and to bond to one another in different ways.
	www.altvetmed.com /face/9860-peptide-sequencing.html (538 words)

	UCSD computer scientist wins Young Investigator Award, research on snake venom proteins highlighted
		Modified snake venom proteins have been used in the past to create blood thickening and thinning drugs and powerful pain killers -- but there is much more to learn about proteins from snake venom — and Bandeira's research provides a new and improved way to study them.
		The award-winning protein analysis technique gives scientists two new technical capabilities: the ability to glean amino acid sequences from mixtures of unidentified proteins and identify the specific ways in which proteins have been modified.
		While the improved protein sequencing technique is expected to advance science and medicine in the long term, the award itself may be useful in the short term.
	www.eurekalert.org /pub_releases/2006-11/uoc--ucs111306.php (980 words)

	MBCL: Protein (Site not responding. Last check: 2007-10-20)
		In addition, we will provide quantitative data and protein sequencing reporting on those sample runs in which this information is specifically requested by the investigator.
		It is important to note that due to the nature of protein sequencing we cannot guarantee sequence information on all samples.
		Nearly 80% of eukaryotic proteins are blocked at the amino-terminus and may not be sequenced without chemical or enzymatic digestion.
	www.cwru.edu /med/corelab/Protein.html (326 words)

	Sequencing Summary
		The sequencing of DNA is accomplished by stopping the lengthening of a DNA chain at a known base and at a known location in the DNA.
		It is common to sequence a protein by the DNA sequence encoding the protein.
		Determining part of a protein's amino-acid sequence (often one end) by one of the above methods may be sufficient to enable the identification of a clone carrying the gene.
	www.bookrags.com /Sequencing (1565 words)

	Protein Sequencing
		The proteins can be visualized on the blot by staining with Coomassie blue (originally developed as acid wool dyes in Kumasi, Ghana in the late 1800’s), Ponceau S, or Amido Black (the latter two are less sensitive stains).
		A protein sample may also be submitted dissolved in 25 µl or less of a suitable solvent, such as MilliQ water, 0.1% to 50% trifluoroacetic acid, 5% acetic acid, or aqueous acetonitrile.
		Whenever a sample protein does not give a readable amino acid sequence, 5 pmol of standard protein will be added to the sample disk, and sequencing run will be resumed.
	www.lerner.ccf.org /services/molecbiotech/protein.php (962 words)

	Protein Science
		For identification of proteins and obtaining sequence data for probe design, mass spectrometry sequencing of a protein from a gel is the more efficient procedure because of the sensitivity,analysis time and relatively simple sampe preparation.
		Mass spectrometry determines protein and peptide masses more accurately than gel filtration or gel electrophoresis in part because the mass is measured more directly than with other techniques; for example, the mass of a peptide with a size of 2000 can be determined with an accuracy of 0.2 mass units.
		Prior to digestion or sequencing, it is preferable to reduce and alkylate the protein to eliminate disulfide bridges, and hence cross linked peptides and protect cysteine; without alkylation, cysteine cannot be identified during Edman sequencing.
	www.healthsystem.virginia.edu /internet/biomolec/proteinscience.cfm (2007 words)

	Method for protein and peptide sequencing using derivatized glass supports - Patent 4992383
		Peptides or proteins are sequenced by stepwise degradation while immobilized on a glass support derivatized with a silica-binding substance bearing a free acid group, especially a sulfonic acid group.
		The primary sequence of amino acids in a peptide or protein is commonly determined by a stepwise chemical degradation process in which amino acids are removed one-by-one from one end of the peptide, and identified.
		Automatic protein sequencers in which the Edman degradation reactions are carried out in a film on the inside surface of spinning cup are known.
	www.freepatentsonline.com /4992383.html (3571 words)

	3.5 Sequencing (Site not responding. Last check: 2007-10-20)
		Protein chemists follow a basic strategy when they attempt to determine the sequence of most proteins.
		From the overlapping peptides and information gained from the original protein, you should be able construct a unique sequence for the protein or polypeptide of interest.
		No primary structure analysis of a cysteine-containing protein can be regarded as complete before the presence and location of disulfide bonds has been established.
	web.mit.edu /esgbio/www/lm/proteins/sequencing/strategies.html (442 words)

	Recombinant DNA/Protein Resource Facility - Oklahoma State University (Site not responding. Last check: 2007-10-20)
		In the first approach, the investigator purifies and quantifies the requisite amount of soluble protein.
		In the second approach, the protein is subjected to SDS-PAGE and electrotransfer to PVDF membrane.
		The investigator then stains and destains the PVDF membrane with dilute Coomassie and submits this stained membrane, with an indication of which band should be sequenced.
	dnaproteincore.biochem.okstate.edu /protein1.shtml (163 words)

	Protein Sequencing
		Protein sequencing is carried out with an ABI 47A protein sequencing system, a self-contained unit utilizing Edman chemistry.
		The typical amount of protein analyzed is about 50 picomoles.
		The protein is attached to a glass support filter and analysis is conduct automatically via an internal HPLC unit and supporting software.
	www.bumc.bu.edu /Dept/Content.aspx?DepartmentID=284&PageID=183 (62 words)

	Dartmouth MBC \| Protein Sequencing (Site not responding. Last check: 2007-10-20)
		When using mass analysis to identify proteins, a crucial step in the process is the chemical or proteolytic digestion of the sample to produce peptides with predictable characteristics.
		Identification of a protein is made by comparing the mass of identified peptides to a database of peptides generated by a theoretical digestion of all known proteins.
		Digestion is usually preceded by reduction of the protein’s disulfide bonds followed by alkylation of the sulfhydryl groups to prevent further reaction.
	www.dartmouth.edu /~mbcf/OldMBCF/Services/ProtSeq (1836 words)

	Protein Sequencing (Site not responding. Last check: 2007-10-20)
		Although in SDS-PAGE theory, protein is saturated with SDS and the pI of the protein should not matter, we recommend that a membrane also be placed on the cathode side of the transblot sandwich in case the pI of the protein is near or greater than the pH of the blotting buffer.
		Sequencing chemistry begins with immobilization of protein onto a glass fiber disc followed by coupling phenylisothiocyanate (PITC) to the N-terminal amine group of the polypeptide chain to form a phenylthiocarbamyl (PTC) protein.
		If the amount of protein to be sequenced is limited and you are concerned about sample loss during reduction and alkylation, you can sequence non-derivatized in the hope that there are no cysteine residues in the sequence since cysteine is a relatively rare amino acid.
	web.mit.edu /biopolymers/www/protein_sequencing.html (8226 words)

	Protein Sequencing
		Whether you are trying to characterize an unknown protein sample (15 to 20 residues sequencing) or simply require sequence confirmation of an expressed protein (5 residues sequencing), this is the service you need.
		The protein should be electroblotted from 1D or 2D gels and stained with Comassie Blue (R250).
		Protein should be free of detergent, salts and buffers.
	www.genosphere-biotech.com /protseq/protseq.htm (557 words)

	Pharmaceutical proteins glossary
		When a protein exhibits extensive sequence similarity to a characterised protein and/ or has the same conserved regions then the label ‘probable' is used in the DE line.
		All new proteins in the cell have a tag on them, telling whether the protein is to be sent out of the cell or to a special part in the cell.
		Proteins provide the critical link between genes and disease, and as such are the key to understanding of basic biological processes including disease pathology, diagnosis, and treatment.
	www.genomicglossaries.com /content/proteins_glossary.asp (3523 words)

	Protein/Protein Sequencing Protocols
		For this reason proteins are often cleaved with proteases, such a trypsin, chymotrypsin, V8 protease etc., and the N-terminal segments of the fragments determined.
		After copuling the PTC protein is washed with ethyl acetate and heptane to remove excess PITC and then treated with neat TFA to cleave the first amino acid forming an ATZ-amino acid and leaving a new amino terminal for subsequent cleavage.
		The chromatograms from consecutive cycles are compared to establish the N-terminal protein sequence of the protein/peptide.
	www.protocol-online.org /prot/Molecular_Biology/Protein/Protein_Sequencing (307 words)

	N-terminal protein sequencing
		The Protein Facility utilizes a Perkin Elmer Applied Biosystems Model 494 Procise protein/peptide sequencer with an on-line Perkin Elmer Applied Biosystems Model 140C PTH Amino Acid Analyzer.
		The chemical process employed by the protein sequencer to determine the amino acid sequence is derived from the degradation method developed by Edman.
		The Protein Facility of the Iowa State University Office of Biotechnology
	www.biotech.iastate.edu /facilities/protein/nsequence494.html (521 words)

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