Circular permutation in proteins

<h2 id="history">History</h2>

In 1979, Bruce Cunningham and his colleagues discovered the first instance of a circularly permuted protein in nature.<a class="footnote-ref" id="fnref:1" href="#fn:1">1</a> After determining the peptide sequence of the <a href="/facts/Lectin/I7Clqx4X">lectin</a> protein favin, they noticed its similarity to a known protein – <a href="/facts/Concanavalin_A/36fcWIg8">concanavalin A</a> – except that the ends were circularly permuted. Later work confirmed the circular permutation between the pair<a class="footnote-ref" id="fnref:2" href="#fn:2">2</a> and showed that concanavalin A is permuted <a href="/facts/Posttranslational_modification/KMUayTIc">post-translationally</a><a class="footnote-ref" id="fnref:3" href="#fn:3">3</a> through cleavage and an unusual protein ligation.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a>
After the discovery of a natural circularly permuted protein, researchers looked for a way to emulate this process. In 1983, David Goldenberg and Thomas Creighton were able to create a circularly permuted version of a protein by <a href="/facts/Chemical_ligation/JFnI7gWJ">chemically ligating</a> the termini to create a <a href="/facts/Cyclic_peptide/wTgSkstK">cyclic protein</a>, then introducing new termini elsewhere using <a href="/facts/Trypsin/wrwS23rh">trypsin</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a> In 1989, <a href="/facts/Karolin_Luger/qR1Xh4pD">Karolin Luger</a> and her colleagues introduced a genetic method for making circular permutations by carefully fragmenting and ligating DNA.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a> This method allowed for permutations to be introduced at arbitrary sites.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a>
Despite the early discovery of post-translational circular permutations and the suggestion of a possible genetic mechanism for evolving circular permutants, it was not until 1995 that the first circularly permuted pair of genes were discovered. <a href="/facts/Saposin/jvFvUEMT">Saposins</a> are a class of proteins involved in <a href="/facts/Sphingolipid/qdG4l8DQ">sphingolipid</a> catabolism and <a href="/facts/Antigen_presentation/RMEAcYwR">antigen presentation</a> of <a href="/facts/Lipid/TdQR87HX">lipids</a> in humans. <a href="/facts/Chris_Ponting/P7W8vneY">Chris Ponting</a> and Robert Russell identified a circularly permuted version of a saposin inserted into plant <a href="/facts/Aspartic_proteinase/TSywUn4P">aspartic proteinase</a>, which they nicknamed <a href="/facts/Plant-specific_insert/xK12lFxv">swaposin</a>.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> Saposin and swaposin were the first known case of two natural genes related by a circular permutation.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a>
Hundreds of examples of protein pairs related by a circular permutation were subsequently discovered in nature or produced in the laboratory. As of February 2012, the Circular Permutation Database<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> contains 2,238 circularly permuted protein pairs with known structures, and many more are known without structures.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> The CyBase database collects proteins that are cyclic, some of which are permuted variants of cyclic wild-type proteins.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> SISYPHUS is a database that contains a collection of hand-curated manual alignments of proteins with non-trivial relationships, several of which have circular permutations.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a>

<h2 id="evolution">Evolution</h2>
There are two main models that are currently being used to explain the evolution of circularly permuted proteins: permutation by duplication and fission and fusion. The two models have compelling examples supporting them, but the relative contribution of each model in evolution is still under debate.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a> Other, less common, mechanisms have been proposed, such as "cut and paste"<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a> or "<a href="/facts/Exon_shuffling/cSFkTmXa">exon shuffling</a>".<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a>

<h3>Permutation by duplication</h3>

The earliest model proposed for the evolution of circular permutations is the permutation by duplication mechanism.<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a> In this model, a precursor gene first undergoes a <a href="/facts/Gene_duplication/CcfJYsDF">duplication</a> and fusion to form a large <a href="/facts/Tandem_repeat/V40yCKFJ">tandem repeat</a>. Next, <a href="/facts/Genetic_code/zUK0bY1B">start and stop codons</a> are introduced at corresponding locations in the duplicated gene, removing redundant sections of the protein.
One surprising prediction of the permutation by duplication mechanism is that intermediate permutations can occur. For instance, the duplicated version of the protein should still be functional, since otherwise evolution would quickly select against such proteins. Likewise, partially duplicated intermediates where only one terminus was truncated should be functional. Such intermediates have been extensively documented in protein families such as <a href="/facts/DNA_methyltransferase/NtyJN49T">DNA methyltransferases</a>.<a class="footnote-ref" id="fnref:18" href="#fn:18">18</a>

<h4>Saposin and swaposin</h4>

An example for permutation by duplication is the relationship between saposin and swaposin. <a href="/facts/Prosaposin/jvFvUEMT">Saposins</a> are highly conserved <a href="/facts/Glycoprotein/bKPzzW7m">glycoproteins</a>, approximately 80 amino acid residues long and forming a four <a href="/facts/Alpha_helix/7CESPIYJ">alpha helical</a> structure. They have a nearly identical placement of cysteine residues and glycosylation sites. The <a href="/facts/CDNA/P2nWeY4T">cDNA</a> sequence that codes for saposin is called <a href="/facts/Prosaposin/jvFvUEMT">prosaposin</a>. It is a precursor for four cleavage products, the saposins A, B, C, and D. The four saposin domains most likely arose from two tandem duplications of an ancestral gene.<a class="footnote-ref" id="fnref:19" href="#fn:19">19</a> This repeat suggests a mechanism for the evolution of the relationship with the <a href="/facts/Plant-specific_insert/xK12lFxv">plant-specific insert</a> (PSI). The PSI is a domain exclusively found in plants, consisting of approximately 100 residues and found in plant <a href="/facts/Aspartic_proteinase/TSywUn4P">aspartic proteases</a>.<a class="footnote-ref" id="fnref:20" href="#fn:20">20</a> It belongs to the saposin-like protein family (SAPLIP) and has the N- and C- termini "swapped", such that the order of helices is 3-4-1-2 compared with saposin, thus leading to the name "swaposin".<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a><a class="footnote-ref" id="fnref:22" href="#fn:22">22</a>

<h3>Fission and fusion</h3>

Another model for the evolution of circular permutations is the fission and fusion model. The process starts with two partial proteins. These may represent two independent polypeptides (such as two parts of a <a href="/facts/Heterodimer/c8LwFJPG">heterodimer</a>), or may have originally been halves of a single protein that underwent a fission event to become two polypeptides.
The two proteins can later fuse together to form a single polypeptide. Regardless of which protein comes first, this fusion protein may show similar function. Thus, if a fusion between two proteins occurs twice in evolution (either between <a href="/facts/Homology_(biology)/muctKlyT">paralogues</a> within the same species or between <a href="/facts/Homology_(biology)/muctKlyT">orthologues</a> in different species) but in a different order, the resulting fusion proteins will be related by a circular permutation.
Evidence for a particular protein having evolved by a fission and fusion mechanism can be provided by observing the halves of the permutation as independent polypeptides in related species, or by demonstrating experimentally that the two halves can function as separate polypeptides.<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a>

<h4>Transhydrogenases</h4>

An example for the fission and fusion mechanism can be found in <a href="/facts/NAD(P)%252B_transhydrogenase_(Si-specific)/K5FmkKYe">nicotinamide nucleotide transhydrogenases</a>.<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a> These are <a href="/facts/Cell_membrane/vAXSD0DT">membrane</a>-bound <a href="/facts/Enzyme/DSI1Fh7y">enzymes</a> that catalyze the transfer of a hydride ion between <a href="/facts/NAD%252B/BHdLW925">NAD(H)</a> and <a href="/facts/NADPH/XMgmPQ5t">NADP(H)</a> in a reaction that is coupled to <a href="/facts/Proton_pump/mMzXv8P3">transmembrane proton translocation</a>. They consist of three major functional units (I, II, and III) that can be found in different arrangement in <a href="/facts/Bacteria/wC8xSCsU">bacteria</a>, <a href="/facts/Protozoa/JczTf25H">protozoa</a>, and higher <a href="/facts/Eukaryote/SkwyPLMA">eukaryotes</a>. <a href="/facts/Phylogenetics/bw4rsovt">Phylogenetic analysis</a> suggests that the three groups of domain arrangements were acquired and fused independently.<a class="footnote-ref" id="fnref:25" href="#fn:25">25</a>

<h3>Other processes that can lead to circular permutations</h3>
<h4>Post-translational modification</h4>
The two evolutionary models mentioned above describe ways in which genes may be circularly permuted, resulting in a circularly permuted <a href="/facts/MRNA/oUL6qxQn">mRNA</a> after <a href="/facts/Transcription_(genetics)/bDgp9HDN">transcription</a>. Proteins can also be circularly permuted via <a href="/facts/Post-translational_modification/KMUayTIc">post-translational modification</a>, without permuting the underlying gene. Circular permutations can happen spontaneously through <a href="/facts/Autocatalysis/2eGCpunY">autocatalysis</a>, as in the case of <a href="/facts/Concanavalin_A/36fcWIg8">concanavalin A</a>.<a class="footnote-ref" id="fnref:26" href="#fn:26">26</a> Alternately, permutation may require <a href="/facts/Restriction_enzyme/Mg0VgkCX">restriction enzymes</a> and <a href="/facts/Ligase/cnwMmUln">ligases</a>.<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a>

<h2 id="role-in-protein-engineering">Role in protein engineering</h2>
Many proteins have their termini located close together in 3D space.<a class="footnote-ref" id="fnref:28" href="#fn:28">28</a><a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> Because of this, it is often possible to design circular permutations of proteins. Today, circular permutations are generated routinely in the lab using standard genetics techniques.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a> Although some permutation sites prevent the protein from <a href="/facts/Protein_folding/rf3nR2Y1">folding</a> correctly, many permutants have been created with nearly identical structure and function to the original protein.
The motivation for creating a circular permutant of a protein can vary. Scientists may want to improve some property of the protein, such as:

<ul><li>Reduce <a href="/facts/Proteolysis/GtQdv6J7">proteolytic</a> susceptibility. The rate at which proteins are broken down can have a large impact on their activity in cells. Since termini are often accessible to <a href="/facts/Protease/G1ASdVat">proteases</a>, designing a circularly permuted protein with less-accessible termini can increase the lifespan of that protein in the cell.<a class="footnote-ref" id="fnref:31" href="#fn:31">31</a></li>
<li>Improve <a href="/facts/Catalysis/LPBS7TQC">catalytic activity</a>. Circularly permuting a protein can sometimes increase the rate at which it catalyzes a chemical reaction, leading to more efficient proteins.<a class="footnote-ref" id="fnref:32" href="#fn:32">32</a></li>
<li>Alter substrate or <a href="/facts/Ligand_binding/44QLL4eU">ligand binding</a>. Circularly permuting a protein can result in the loss of <a href="/facts/Enzyme_substrate_(biology)/6MnaV19h">substrate binding</a>, but can occasionally lead to novel ligand binding activity or altered substrate specificity.<a class="footnote-ref" id="fnref:33" href="#fn:33">33</a></li>
<li>Improve <a href="/facts/Thermostability/PnqTAwae">thermostability</a>. Making proteins active over a wider range of temperatures and conditions can improve their utility.<a class="footnote-ref" id="fnref:34" href="#fn:34">34</a></li></ul>
Alternately, scientists may be interested in properties of the original protein, such as:

<ul><li>Fold order. Determining the order in which different parts of a protein fold is challenging due to the extremely fast time scales involved. Circularly permuted versions of proteins will often fold in a different order, providing information about the folding of the original protein.<a class="footnote-ref" id="fnref:35" href="#fn:35">35</a><a class="footnote-ref" id="fnref:36" href="#fn:36">36</a><a class="footnote-ref" id="fnref:37" href="#fn:37">37</a></li>
<li>Essential structural elements. Artificial circularly permuted proteins can allow parts of a protein to be selectively deleted. This gives insight into which structural elements are essential or not.<a class="footnote-ref" id="fnref:38" href="#fn:38">38</a></li>
<li>Modify <a href="/facts/Protein_quaternary_structure/ukuyKJfj">quaternary structure</a>. Circularly permuted proteins have been shown to take on different quaternary structure than wild-type proteins.<a class="footnote-ref" id="fnref:39" href="#fn:39">39</a></li>
<li>Find insertion sites for other proteins. Inserting one protein as a domain into another protein can be useful. For instance, inserting <a href="/facts/Calmodulin/CbEnEYHE">calmodulin</a> into <a href="/facts/Green_fluorescent_protein/6nWDMhSC">green fluorescent protein</a> (GFP) allowed researchers to measure the activity of calmodulin via the <a href="/facts/Fluorescence/qsJVT2qP">fluorescence</a> of the split-GFP.<a class="footnote-ref" id="fnref:40" href="#fn:40">40</a> Regions of GFP that tolerate the introduction of circular permutation are more likely to accept the addition of another protein while retaining the function of both proteins.</li>
<li>Design of novel <a href="/facts/Biocatalyst/DSI1Fh7y">biocatalysts</a> and biosensors. Introducing circular permutations can be used to design proteins to catalyze specific chemical reactions,<a class="footnote-ref" id="fnref:41" href="#fn:41">41</a><a class="footnote-ref" id="fnref:42" href="#fn:42">42</a> or to detect the presence of certain molecules using proteins. For instance, the GFP-calmodulin fusion described above can be used to detect the level of calcium ions in a sample.<a class="footnote-ref" id="fnref:43" href="#fn:43">43</a></li></ul>
<h2 id="algorithmic-detection">Algorithmic detection</h2>
Many <a href="/facts/List_of_sequence_alignment_software/6AJKAI0p">sequence alignment</a> and <a href="/facts/Structural_alignment_software/n00b8g2l">protein structure alignment algorithms</a> have been developed assuming linear data representations and as such are not able to detect circular permutations between proteins.<a class="footnote-ref" id="fnref:44" href="#fn:44">44</a> Two examples of frequently used methods that have problems correctly aligning proteins related by circular permutation are <a href="/facts/Dynamic_programming/CLcabtmk">dynamic programming</a> and many <a href="/facts/Hidden_Markov_model/ur1zTAhP">hidden Markov models</a>.<a class="footnote-ref" id="fnref:45" href="#fn:45">45</a> As an alternative to these, a number of algorithms are built on top of non-linear approaches and are able to detect <a href="/facts/Protein_topology/pNXTH8nv">topology</a>-independent similarities, or employ modifications allowing them to circumvent the limitations of dynamic programming.<a class="footnote-ref" id="fnref:46" href="#fn:46">46</a><a class="footnote-ref" id="fnref:47" href="#fn:47">47</a> The table below is a collection of such methods.
The algorithms are classified according to the type of input they require. Sequence-based algorithms require only the sequence of two proteins in order to create an alignment.<a class="footnote-ref" id="fnref:48" href="#fn:48">48</a> Sequence methods are generally fast and suitable for searching whole genomes for circularly permuted pairs of proteins.<a class="footnote-ref" id="fnref:49" href="#fn:49">49</a> Structure-based methods require 3D structures of both proteins being considered.<a class="footnote-ref" id="fnref:50" href="#fn:50">50</a> They are often slower than sequence-based methods, but are able to detect circular permutations between distantly related proteins with low sequence similarity.<a class="footnote-ref" id="fnref:51" href="#fn:51">51</a> Some structural methods are topology independent, meaning that they are also able to detect more complex rearrangements than circular permutation.<a class="footnote-ref" id="fnref:52" href="#fn:52">52</a>

<table><tbody><tr><th>NAME</th><th>Type</th><th>Description</th><th>Author</th><th>Year</th><th>Availability</th><th>Reference</th></tr><tr><td>FBPLOT</td><td>Sequence</td><td>Draws <a href="/facts/Dot_plot_(bioinformatics)/7zhgPAGd">dot plots</a> of suboptimal sequence alignments</td><td>Zuker</td><td>1991</td><td></td><td><a class="footnote-ref" id="fnref:53" href="#fn:53">53</a></td></tr><tr><td>Bachar et al.</td><td>Structure, topology independent</td><td>Uses <a href="/facts/Geometric_hashing/DPl2SNWx">geometric hashing</a> for the topology independent comparison of proteins</td><td>Bachar et al.</td><td>1993</td><td></td><td><a class="footnote-ref" id="fnref:54" href="#fn:54">54</a></td></tr><tr><td>Uliel at al</td><td>Sequence</td><td>First suggestion of how a sequence comparison algorithm for the detection of circular permutations can work</td><td>Uliel et al.</td><td>1999</td><td></td><td><a class="footnote-ref" id="fnref:55" href="#fn:55">55</a></td></tr><tr><td>SHEBA</td><td>Structure</td><td>Uses SHEBA algorithm to create structural alignments for various permutation points, while iteratively improving the cut point.</td><td>Jung & Lee</td><td>2001</td><td></td><td><a class="footnote-ref" id="fnref:56" href="#fn:56">56</a></td></tr><tr><td>Multiprot</td><td>Structure, Topology independent</td><td>Calculates a sequence order independent multiple protein structure alignment</td><td>Shatsky</td><td>2004</td><td><a href="http://bioinfo3d.cs.tau.ac.il/MultiProt/">server, download</a></td><td><a class="footnote-ref" id="fnref:57" href="#fn:57">57</a></td></tr><tr><td>RASPODOM</td><td>Sequence</td><td>Modified <a href="/facts/Needleman%25E2%2580%2593Wunsch_algorithm/B3HJ8xU5">Needleman & Wunsch sequence comparison algorithm</a></td><td>Weiner et al.</td><td>2005</td><td><a href="https://domainworld.uni-muenster.de/developing/raspodom/">download</a></td><td><a class="footnote-ref" id="fnref:58" href="#fn:58">58</a></td></tr><tr><td>CPSARST</td><td>Structure</td><td>Describes protein structures as one-dimensional text strings by using a <a href="/facts/Ramachandran_plot/0KVStzpJ">Ramachandran</a> sequential transformation (RST) algorithm. Detects circular permutations through a duplication of the sequence representation and "double filter-and-refine" strategy.</td><td>Lo, Lyu</td><td>2008</td><td><a href="https://web.archive.org/web/20090618201207/http://sarst.life.nthu.edu.tw/">server</a></td><td><a class="footnote-ref" id="fnref:59" href="#fn:59">59</a></td></tr><tr><td>GANGSTA +</td><td>Structure</td><td>Works in two stages: Stage one identifies coarse alignments based on secondary structure elements. Stage two refines the alignment on residue level and extends into loop regions.</td><td>Schmidt-Goenner et al.</td><td>2009</td><td><a href="http://agknapp.chemie.fu-berlin.de/gplus/">server</a>, <a href="http://agknapp.chemie.fu-berlin.de/gplus/?page=downloads">download</a></td><td><a class="footnote-ref" id="fnref:60" href="#fn:60">60</a></td></tr><tr><td>SANA</td><td>Structure</td><td>Detect initial aligned fragment pairs (AFPs). Build network of possible AFPs. Use random-mate algorithm to connect components to a graph.</td><td>Wang et al.</td><td>2010</td><td><a href="http://zhangroup.aporc.org/bioinfo/SANA">download</a></td><td><a class="footnote-ref" id="fnref:61" href="#fn:61">61</a></td></tr><tr><td>CE-CP</td><td>Structure</td><td>Built on top of the <a href="/facts/Structural_alignment/WxdSr9LI">combinatorial extension</a> algorithm. Duplicates atoms before alignment, truncates results after alignment</td><td>Bliven et al.</td><td>2015</td><td><a href="http://www.rcsb.org/pdb/workbench/workbench.do">server</a>, <a href="http://source.rcsb.org/">download</a></td><td><a class="footnote-ref" id="fnref:62" href="#fn:62">62</a></td></tr><tr><td>TopMatch</td><td>Structure</td><td>Has option to calculate topology-independent protein structure alignment</td><td>Sippl & Wiederstein</td><td>2012</td><td><a href="https://topmatch.services.came.sbg.ac.at">server</a>, <a href="https://www.came.sbg.ac.at/downloads.php">download</a></td><td><a class="footnote-ref" id="fnref:63" href="#fn:63">63</a></td></tr></tbody></table>

This article was adapted from the following source under a <a href="https://creativecommons.org/licenses/by/4.0/">CC BY 4.0</a> license (<a href="https://en.wikipedia.org/w/index.php?title=Circular_permutation_in_proteins&action=history&date-range-to=2012-03-30">2012</a>) (<a href="http://topicpageswiki.plos.org/wiki/talk:Circular_permutation_in_proteins">reviewer reports</a>): 
Spencer Bliven; Andreas Prlić (2012). <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3320104">"Circular permutation in proteins"</a>. <a href="/facts/PLOS_Computational_Biology/u2r6IAgl">PLOS Computational Biology</a>. 8 (3): e1002445. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1371%2FJOURNAL.PCBI.1002445">10.1371/JOURNAL.PCBI.1002445</a>. <a href="/facts/ISSN_(identifier)/DPAflDvU">ISSN</a> <a href="https://search.worldcat.org/issn/1553-734X">1553-734X</a>. <a href="/facts/PMC_(identifier)/dX1zMt71">PMC</a> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3320104">3320104</a>. <a href="/facts/PMID_(identifier)/JlHAvMHt">PMID</a> <a href="https://pubmed.ncbi.nlm.nih.gov/22496628">22496628</a>. <a href="/facts/WDQ_(identifier)/5Myy74K5">Wikidata</a> Q5121672.

<h2 id="further-reading">Further reading</h2>
<ul><li>David Goodsell (April 2010) <a href="http://www.rcsb.org/pdb/101/motm.do?momID=124">Concanavalin A and Circular Permutation</a> Protein Data Bank (PDB) Molecule of the Month</li></ul>

<h2 id="external-links">External links</h2>
<ul><li>Overview of all the structural information available in the <a href="/facts/Protein_Data_Bank/oUhq4ABD">PDB</a> for <a href="/facts/UniProt/lfDDHjAl">UniProt</a>: <a href="https://www.ebi.ac.uk/pdbe/pdbe-kb/proteins/P02866">P02866</a> (Concanavalin-A) at the <a href="/facts/PDBe-KB/p1WX7lPH">PDBe-KB</a>.</li></ul>

<h2 id="references">References</h2>

<ol>
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Circular permutation in proteins open-in-new

Circular permutation in proteins