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<h1>IMProve: A Data-Driven Approach to Predicting Integral Membrane Protein Expression</h1>
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Integral membrane proteins (IMPs) are of both fundamental scientific and medical importance, because they govern the flow of nutrients and information across cell membranes and because they comprise the largest class of therapeutic drug targets. However, the structural and biophysical characterization of IMPs lags far behind that of other protein classes, due to the inability to reliably produce significant quantities of IMPs for experimental studies. We are developing methods to predict and improve IMP expression to address this problem by removing fundamental gaps in knowledge and technology via a combination of computational and experimental methods.
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<label for="sequence" class="control-label">
Sequence (If protein, we will find naturally-occuring gene sequences) [FASTA-formatted, if multiple]
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<textarea name="sequence" cols="40" rows="10" class="textarea form-control" id="id_sequence"></textarea> </div>
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FASTA-formatted sequence file
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<option value="improve_2018">IMProve (Saladi et al., JBC, 2018)</option>
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<label for="email" class="control-label requiredField">Your email (if not an academic domain, your requests will initially be held until approval):
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<label for="email" class="control-label requiredField">Your email (if not an academic domain, your job will be held for approval):
<span class="asteriskField">*</span>
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<input type="email" name="email" maxlength="100" class="emailinput form-control" required="" id="email" placeholder="Please enter an email address" value="{{ email }}"></div>
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Sequence (If protein, we will find naturally-occuring gene sequences) [FASTA-formatted, if multiple]
</label>
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<textarea name="sequence" cols="40" rows="10" class="textarea form-control" id="id_sequence"></textarea> </div>
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FASTA-formatted sequence file
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Method
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<option value="improve_2018">IMProve (Saladi et al., JBC, 2018)</option>
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<h2 id="publications">Publications</h2>
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<div class="col-md-11 col-centered" id="ecoli_ml_paper">
<h3>Decoding sequence-level information to predict membrane protein expression</h3>
Shyam M Saladi, Nauman Javed, Axel Müller, William M Clemons Jr.<br>
<em>Journal of Biological Chemistry.</em> 2018 Jan 29; 293(13):4913-4927<br>
<a href="https://doi.org/10.1074/jbc.RA117.001052">doi: 10.1074/jbc.RA117.001052</a><br>
<p>
<img class="img-responsive pub-img" src="/static/ecoli_ml_figure.png">
</p><h4>Abstract</h4>
<p align="justify">
The heterologous expression of integral membrane proteins (IMPs) remains a major bottleneck in the characterization of this important protein class. IMP expression levels are currently unpredictable, which renders the pursuit of IMPs for structural and biophysical characterization challenging and inefficient. Experimental evidence demonstrates that changes within the nucleotide or amino acid sequence for a given IMP can dramatically affect expression levels, yet these observations have not resulted in generalizable approaches to improve expression levels. Here, we develop a data-driven statistical predictor named IMProve that, using only sequence information, increases the likelihood of selecting an IMP that expresses in Escherichia coli. The IMProve model, trained on experimental data, combines a set of sequence-derived features resulting in an IMProve score, where higher values have a higher probability of success. The model is rigorously validated against a variety of independent data sets that contain a wide range of experimental outcomes from various IMP expression trials. The results demonstrate that use of the model can more than double the number of successfully expressed targets at any experimental scale. IMProve can immediately be used to identify favorable targets for characterization. Most notably, IMProve demonstrates for the first time that IMP expression levels can be predicted directly from sequence.
</p>
<a href="https://doi.org/10.1074/jbc.RA117.001052" class="btn btn-primary">Visit Article</a>
<a href="/#submit" class="btn btn-primary">Try Model</a>
<a href="https://www.github.com/clemlab/IMProve" class="btn btn-primary">View Code</a>
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<br>
<br>
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<div class="col-md-11 col-centered" id="cgmd_paper">
<h3>A Link between Integral Membrane Protein Expression and Simulated Integration Efficiency</h3>
Stephen S. Marshall, Michiel J.M. Niesen, Axel Mueller, Katrin Tiemann, Shyam M. Saladi, Rachel P. Galimidi, Bin Zhang, William M. Clemons, Jr., Thomas F. Miller III<br>
<em>Cell Reports.</em> 2016 Aug 23; 16(8):2169-2177 <br>
<a href="http://dx.doi.org/10.1016/j.celrep.2016.07.042">doi: 10.1016/j.celrep.2016.07.042</a>
<p>
<img class="img-responsive pub-img" src="/static/cgmd_figure.jpg">
</p><h4>Abstract</h4>
<p align="justify">
Integral membrane proteins (IMPs) control the flow of information and nutrients across cell membranes, yet IMP mechanistic studies are hindered by difficulties in expression. We investigate this issue by addressing the connection between IMP sequence and observed expression levels. For homologs of the IMP TatC, observed expression levels vary widely and are affected by small changes in protein sequence. The effect of sequence changes on experimentally observed expression levels strongly correlates with the simulated integration efficiency obtained from coarse-grained modeling, which is directly confirmed using an in vivo assay. Furthermore, mutations that improve the simulated integration efficiency likewise increase the experimentally observed expression levels. Demonstration of these trends in both Escherichia coli and Mycobacterium smegmatis suggests that the results are general to other expression systems. This work suggests that IMP integration is a determinant for successful expression, raising the possibility of controlling IMP expression via rational design.
</p>
<a href="https://linkinghub.elsevier.com/retrieve/pii/S2211-1247(16)30960-3"
class="btn btn-primary">Visit Article</a>
</div>
</div>
</div>
</div>
<!-- End Publications -->
<h2 id="team">Team</h2>
<div class="content">
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<div class="team-col col-md-3" id="bil">
<h3><a href="http://clemonslab.caltech.edu">Bil Clemons</a></h3>
<img class="img-responsive team-img" src="/static/team_photos/WMC.jpg"/>
</div>
<div class="team-col col-md-3" id="tom">
<h3><a href="https://millergroup.caltech.edu">Tom Miller</a></h3>
<img class="img-responsive team-img" src="/static/team_photos/TFM.jpg"/>
</div>
<div class="team-col col-md-3" id="charles">
<h3>Charles Nelson</h3>
<img class="img-responsive team-img" src="/static/team_photos/CN.jpg"/>
</div>
<div class="team-col col-md-3" id="michiel">
<h3>Michiel Niesen</h3>
<img class="img-responsive team-img" src="/static/team_photos/MN.jpg"/>
</div>
<div class="team-col col-md-3" id="shyam">
<h3><a href="https://shyam.saladi.org">Shyam Saladi</a></h3>
<img class="img-responsive team-img" src="/static/team_photos/SMS.jpg"/>
</div>
<div class="team-col col-md-3" id="matthew">
<h3>Matthew Zimmer</h3>
<img class="img-responsive team-img" src="/static/team_photos/MZ.jpg"/>
</div>
</div>
</div>
<!-- End Team -->
<h2 id="contact">Contact us!</h2>
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<div class="col-centered">
<p align="justify">
We are actively developing this work and are working to make methods accessible to the broader community to accelerate progress of membrane protein biochemical and biophysical studies. Please contact us to discuss early access to new tools, or <a href="#user">sign up</a> for an account to be kept abreast of improvements and new releases.
</p>
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<!-- End contact section -->
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