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==Three-dimensional structure of a truncated phosphoribosylanthranilate isomerase (residues 255-384) from Escherichia coli== | |||
<StructureSection load='2kzh' size='340' side='right' caption='[[2kzh]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2kzh]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2KZH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2KZH FirstGlance]. <br> | |||
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1pii|1pii]]</td></tr> | |||
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">trpC, b1262, JW1254 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])</td></tr> | |||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Phosphoribosylanthranilate_isomerase Phosphoribosylanthranilate isomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.3.1.24 5.3.1.24] </span></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2kzh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2kzh OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2kzh RCSB], [http://www.ebi.ac.uk/pdbsum/2kzh PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The (betaalpha)(8) barrel is one of the most common protein folds, and enzymes with this architecture display a remarkable range of catalytic activities. Many of these functions are associated with ancient metabolic pathways, and phylogenetic reconstructions suggest that the (betaalpha)(8) barrel was one of the very first protein folds to emerge. Consequently, there is considerable interest in understanding the evolutionary processes that gave rise to this fold. In particular, much attention has been focused on the plausibility of (betaalpha)(8) barrel evolution from homodimers of half barrels. However, we previously isolated a three-quarter-barrel-sized fragment of a (betaalpha)(8) barrel, termed truncated phosphoribosylanthranilate isomerase (trPRAI), that is soluble and almost as thermostable as full-length N-(5'-phosphoribosyl)anthranilate isomerase (PRAI). Here, we report the NMR-derived structure of trPRAI. The subdomain is monomeric, is well ordered and adopts a native-like structure in solution. Side chains from strands beta(1) (Glu3 and Lys5), beta(2) (Tyr25) and beta(6) (Lys122) of trPRAI repack to shield the hydrophobic core from the solvent. This result demonstrates that three-quarter barrels were viable intermediates in the evolution of the (betaalpha)(8) barrel fold. We propose a unified model for (betaalpha)(8) barrel evolution that combines our data, previously published work and plausible scenarios for the emergence of (initially error-prone) genetic systems. In this model, the earliest proto-cells contained diverse pools of part-barrel subdomains. Combinatorial assembly of these subdomains gave rise to many distinct lineages of (betaalpha)(8) barrel proteins, that is, our model excludes the possibility that there was a single (betaalpha)(8) barrel from which all present examples are descended. | |||
The structure of a truncated phosphoribosylanthranilate isomerase suggests a unified model for evolution of the (betaalpha)8 barrel fold.,Setiyaputra S, Mackay JP, Patrick WM J Mol Biol. 2011 Apr 29;408(2):291-303. Epub 2011 Feb 25. PMID:21354426<ref>PMID:21354426</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Phosphoribosylanthranilate isomerase]] | [[Category: Phosphoribosylanthranilate isomerase]] | ||
[[Category: Mackay, J P | [[Category: Mackay, J P]] | ||
[[Category: Patrick, W M | [[Category: Patrick, W M]] | ||
[[Category: Setiyaputra, S | [[Category: Setiyaputra, S]] | ||
[[Category: Isomerase]] | [[Category: Isomerase]] | ||
[[Category: Protein evolution]] | [[Category: Protein evolution]] | ||
Revision as of 14:42, 18 December 2014
Three-dimensional structure of a truncated phosphoribosylanthranilate isomerase (residues 255-384) from Escherichia coliThree-dimensional structure of a truncated phosphoribosylanthranilate isomerase (residues 255-384) from Escherichia coli
Structural highlights
Publication Abstract from PubMedThe (betaalpha)(8) barrel is one of the most common protein folds, and enzymes with this architecture display a remarkable range of catalytic activities. Many of these functions are associated with ancient metabolic pathways, and phylogenetic reconstructions suggest that the (betaalpha)(8) barrel was one of the very first protein folds to emerge. Consequently, there is considerable interest in understanding the evolutionary processes that gave rise to this fold. In particular, much attention has been focused on the plausibility of (betaalpha)(8) barrel evolution from homodimers of half barrels. However, we previously isolated a three-quarter-barrel-sized fragment of a (betaalpha)(8) barrel, termed truncated phosphoribosylanthranilate isomerase (trPRAI), that is soluble and almost as thermostable as full-length N-(5'-phosphoribosyl)anthranilate isomerase (PRAI). Here, we report the NMR-derived structure of trPRAI. The subdomain is monomeric, is well ordered and adopts a native-like structure in solution. Side chains from strands beta(1) (Glu3 and Lys5), beta(2) (Tyr25) and beta(6) (Lys122) of trPRAI repack to shield the hydrophobic core from the solvent. This result demonstrates that three-quarter barrels were viable intermediates in the evolution of the (betaalpha)(8) barrel fold. We propose a unified model for (betaalpha)(8) barrel evolution that combines our data, previously published work and plausible scenarios for the emergence of (initially error-prone) genetic systems. In this model, the earliest proto-cells contained diverse pools of part-barrel subdomains. Combinatorial assembly of these subdomains gave rise to many distinct lineages of (betaalpha)(8) barrel proteins, that is, our model excludes the possibility that there was a single (betaalpha)(8) barrel from which all present examples are descended. The structure of a truncated phosphoribosylanthranilate isomerase suggests a unified model for evolution of the (betaalpha)8 barrel fold.,Setiyaputra S, Mackay JP, Patrick WM J Mol Biol. 2011 Apr 29;408(2):291-303. Epub 2011 Feb 25. PMID:21354426[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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