Image intein mech.png thumb upright 1.25 alt mechanism of protein splicing involving inteins The mechanism of protein splicing involving inteins. In this scheme, the N extein is shown in red, the intein in black, and the N extein in blue. X represents either an oxygen or sulfur atom. An intein is a segment ... ref Intein mediated protein splicing occurs after mRNA has been Translation biology ... by the intein followed by a C extein . After splicing has taken place, the result is also called an extein. History The first intein was discovered in 1988 through sequence comparison between the Neurospora ... chain of F0F1 ATPases. J Biol Chem. 1988 Jul 5 263 19 9102 12 ref vacuole vacuolar ATPase without intein and the homology biology homologous gene in yeast with intein that was first described as a putative ... contain an endonuclease domain that plays a role in intein propagation. In fact, many gene s have unrelated intein coding segments inserted at different positions. For these and other reasons, inteins ... of 138 amino acids and maximum length of 844 amino acids. The first intein was found encoded within ... to have the intein sequence from Glomeromycota. Many of the newly described inteins contain homing endonucleases and some of these are apparently active F. B. Perler, 2002 . The abundance of intein in fungi indicates lateral transfer of intein containing genes. While in eubacteria and archea ... intein in eubacteria and archea are found to be inserted into nucleic acid metabolic protein, like ... , threonine , or cysteine of the intein portion of the precursor protein nucleophile nucleophilically ... N terminal end of the intein. This forms a branched intermediate in which the N extein and C extein are attached, albeit not through a peptide bond. The last residue of the intein is always an asparagine , and the amide nitrogen atom of this side chain cleaves apart the peptide bond between the intein and the C extein, resulting in a free intein segment with a terminal cyclic imide . Finally, the free ... more details
Protein splicing is an intramolecular reaction of a particular protein in which an internal protein segment called an intein is removed from a precursor protein with a ligation of C terminal and N terminal external proteins called extein s on both sides. The splicing junction of the precursor protein is mainly a cysteine or a serine , which are amino acid s containing a nucleophilic side chain . The protein splicing reactions which are known now do not require exogenous cofactors or energy sources such as adenosine triphosphate ATP or guanosine triphosphate GTP . Normally, splicing is associated only with Splicing genetics pre mRNA splicing . Types of inteins The type of the splicing proteins is categorized into four classes maxi intein, mini intein, trans splicing intein, and alanine intein. The maxi inteins are N and C terminal splicing domains containing an endonuclease domain. The mini inteins are typical N and C terminal splicing domains however, the endonuclease domain is not present. The trans splicing inteins are split inteins which are divided into N termini and C termini. Alanine inteins have the splicing junction of an alanine instead of a cysteine or a serine, in both of which the protein splicing occurs. History Protein splicing was reported by two groups Anraku and Stevens in 1990. They both discovered a Saccharomyces cerevisiae VMA1 in a precursor of a vacuolar H sup sup ATPase . The amino acid sequence of the N and C termini corresponded to 70 of that of a vacuolar H sup sup ATPase from other organisms, while the amino acid sequence of the central position corresponded to 30 of that of the yeast HO nuclease External links http starokadomskyy.narod.ru work intein eng.html Short review http starokadomskyy.narod.ru Protein splicing eng.pdf Starokadomskyy PL. Protein Splicing, 2007 http www.neb.com neb inteins.html Protein splicing mechanism and intein structure MeshName Protein Splicing Category Proteins Category Protein biosynthesis de Proteinsplei en ... more details
themselves can be further spliced when this happens, the inside discarded section is known as an intein .... Inteins main Intein An intein is a parasitic segment of a protein that is able to excise itself ... of finding a copy of the parent gene not containing the intein nucleotide sequence. On contact with the intein free copy the HEG domain initiates the DNA repair Double strand breaks DNA double stranded break repair mechanism. This process causes the intein sequence to be copied from the original source gene to the intein free gene. This is an example of protein directly editing DNA sequence ... more details
encoded within an intron, PI for protein instert for those encoded within an intein. Some authors have ... pmc 49335 ref that is the second enzyme encoded by an intein found in the archaea Thermococcus ... s. Open reading frames encoding homing endonucleases have been found in intron s, intein s, and in freestanding ... cite journal author Moure CM, Gimble FS, Quiocho FA title Crystal structure of the intein homing endonuclease ... coauthors date work publisher pages language archiveurl archivedate quote The Intein Database ... Perler FB title InBase the Intein Database journal Nucleic Acids Res volume 30 issue 1 month January ... . Restriction enzyme . Intron s and intein s. Intragenomic conflict Homing endonuclease genes Intragenomic ... more details
selfref On Wikipedia, splice may refer to Wikipedia Cut and paste move repair holding pen . wiktionary Splice may refer to as connection of two or more pieces of linear material Rope splicing , joining two pieces of rope or cable by weaving the strands of each into the other Eye splice , a method of creating a permanent loop in the end of multi stranded rope by means of rope splicing. V splice, joining two pieces of wood by mating a deep V in one to a long extension of the other Tape splice, the joining of Reel to reel audio tape recording audio tape Film splicer Film Splice , the joining of film stock Electrical splice, the joining of wires in electrical wiring Optical splice, the joining of optical fibers Fusion splicing , a permanent splice between two fibers Mechanical splice , a temporary splice between two fibers in genetics RNA splicing , a natural modification of ribonucleic acids Genetic engineering , also known as gene splicing , artificially joining pieces of genetic material Protein splicing , a natural process where intein s are removed in computer science splice system call , a system call used to transfer data on Linux Delayed binding TCP splicing , postponement of the connection between the client and the server in computer networking An operation between two Linked list s, as in the programming language C in other meanings Splice film Splice film , a 2009 science fiction film Splicing veins, the connection of more than one vein to formulate a long vein conduit for vascular Coronary artery bypass surgery bypass surgery Splice, on a cricket bat , where the handle is joined to the body of the bat Splice the mainbrace , an order given aboard naval vessels to issue the crew with a drink Splice ice cream , an Australian iced confectionery consisting of ice cream surrounded by fruit flavoured ice Spliced TV series , a Canadian animated TV series by Teletoon and Nelvana Software release life cycle , or Software Product Life Cycle SPLICE Satellite knot Splic ... more details
Unreferenced date December 2009 Protein tags are peptide sequences genetically grafted onto a recombinant protein . Often these tags are removable by chemical agents or by enzymatic means, such as proteolysis or intein splicing. Tags are attached to proteins for various purposes. Affinity tags are appended to proteins so that they can be purified from their crude biological source using an affinity technique. These include chitin binding protein CBP , maltose binding protein MBP , and glutathione S transferase GST . The Polyhistidine tag poly His tag is a widely used protein tag it binds to metal matrices. Solubilization tags are used, especially for recombinant proteins expressed in chaperone deficient species such as E. coli , to assist in the proper folding in proteins and keep them from precipitating. These include thioredoxin TRX and poly NANP . Some affinity tags have a dual role as a solubilization agent, such as MBP, and GST. Chromatography tags are used to alter chromatographic properties of the protein to afford different resolution across a particular separation technique. Often, these consist of polyanionic amino acids, such as FLAG tag . Epitope tags are short peptide sequences which are chosen because high affinity antibodies can be reliably produced in many different species. These are usually derived from viral genes, which explain their high immunoreactivity. Epitope tags include V5 tag , Myc c myc tag , and HA tag . These tags are particularly useful for western blotting , immunofluorescence and immunoprecipitation experiments, although they also find use in antibody purification. Fluorescence tags are used to give visual readout on a protein. GFP and its variants are the most commonly used fluorescence tags. More advanced applications of GFP include using it as a folding reporter fluorescent if folded, colorless if not . Protein tags find many other usages, such as specific enzymatic modification such as biotin ligase tags and chemical modificatio ... more details
Johann Peter Gogarten was born in Bad Oeynhausen, Germany. He is a German American biologist studying the early evolution of life. He studied plant physiology and membrane transport with Friedrich Wilhelm Bentrup in T bingen and Giessen. In 1987 he came to the US as a postdoc to work with Lincoln Taiz at UC Santa Cruz. He currently is Distinguished Professor of Molecular and Cell Biology at the University of Connecticut in Storrs, CT. Gogarten rooted the tree of life using an ancient gene duplication. ref Gogarten, J.P., et al., Evolution of the vacuolar H ATPase implications for the origin of eukaryotes. Proc Natl Acad Sci U S A, 1989. 86 17 p. 6661 5. ref He was also one of the pioneers to recognize the importance and the extent of horizontal gene transfer and its role in microbial evolution. ref Hilario, E. and J.P. Gogarten, Horizontal transfer of ATPase genes the tree of life becomes a net of life. Biosystems, 1993. 31 2 3 p. 111 9. ref ref Gogarten, J.P., W.F. Doolittle, and J.G. Lawrence, Prokaryotic evolution in light of gene transfer. Mol Biol Evol, 2002. 19 12 p. 2226 38. ref One of Gogarten s current focuses in his research is the evolution of homing endonuclease utilizing parasitic genetic elements inteins and the intertwining of selection occurring on the gene, population and the community level multilevel selection, Unit of selection . J. Peter Gogarten was selected as one of BioMed Central s Hot 100 authors in 2007. He is the recipient of a 2009 Fulbright scholarship, a member of the CT Academy of Science and Engineering, and fellow of the American Academy of Microbiology and of the International Society for the Study of the http issol.org Origin of Life . References reflist 4. Swithers K.S., Gogarten J.P. Conservation of Intron and Intein Insertion Sites Implications for Life Histories of Parasitic Genetic Elements BMC Evolutionary Biology 2009, 9 303 External links http gogarten.uconn.edu http gogarten.uconn.edu cvs Gogarten cv.pdf Persondata Metada ... more details
endonucleases intron endonucleases and intein endonucleases. In nature, these proteins are coded by mobile genetic elements, intron s or intein s. Introns propagate by intervening at a precise location ... or intein free allele . For inteins and group I introns, this break leads to the duplication of the intron or intein at the cutting site by means of the homologous recombination repair for double ... more details
Chemical ligation is a set of techniques used for creating long peptide or protein chains. It is the second step of a convergent synthesis convergent approach . First, smaller peptides containing 30 50 amino acid s are prepared by conventional chemical peptide synthesis . Then, they are completely deprotected. Chemical ligation is the technique of coupling these peptides by chemoselective reaction to give a unique reaction product, usually in aqueous solution. With several coupling steps, proteins of up to 200 300 amino acid s can be produced. Methods of chemical ligation There are various techniques described in literature. The most practical and robust method for the chemoselective reaction of unprotected peptides is native chemical ligation . Native chemical ligation has overcome the limitations of the classical synthetic organic chemistry approach to the total synthesis of proteins, and enables the routine total or semi synthesis of protein molecules. The original chemical ligation methods involved the formation of a non native bond at the ligation site. Subsequently, native chemical ligation was developed. In native chemical ligation, an unprotected peptide thioester reacts with a Cys peptide to give a ligation product with a native amide peptide bond at the ligation site. In this method, the initial thioester linked ligation product intermediate rearranges to form an amide bond . Native chemical ligation relies on the presence of a cysteine residue at the ligation site. Methods using removable auxiliary groups can in some instances extend the use of native chemical ligation to non cysteine residues, as can the use of desulfurization subsequent to the ligation e.g. converting a Cys to an Ala . Expressed protein ligation By exploiting naturally occurring intein s it is possible to prepare a Recombinant DNA recombinant polypeptide C terminal thioester . This enables the use of large recombinant protein derived thioesters in native chemical ligation. The recombina ... more details
cutting sites . Homing endonuclease . Restriction enzyme . Intron s and intein s. Intragenomic conflict ... coauthors date work publisher pages language archiveurl archivedate quote The Intein Database and Registry ... Perler FB title InBase the Intein Database journal Nucleic Acids Res volume 30 issue 1 month January ... more details
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