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<spanclass="s2">"DSSP requires at least 6 residues for secondary structure analysis, "</span>
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<spanclass="sa">f</span><spanclass="s2">"but only </span><spanclass="si">{</span><spanclass="nb">len</span><spanclass="p">(</span><spanclass="n">ag</span><spanclass="o">.</span><spanclass="n">residues</span><spanclass="p">)</span><spanclass="si">}</span><spanclass="s2"> residue(s) were provided in the selection."</span>
<li><p><strong>atoms</strong> (<em>Union</em><em>[</em><aclass="reference internal" href="../core/universe.html#MDAnalysis.core.universe.Universe" title="MDAnalysis.core.universe.Universe"><em>Universe</em></a><em>, </em><aclass="reference internal" href="../core/groups.html#MDAnalysis.core.groups.AtomGroup" title="MDAnalysis.core.groups.AtomGroup"><em>AtomGroup</em></a><em>]</em>) – input Universe or AtomGroup. In both cases, only protein residues will
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<li><p><strong>atoms</strong> (<em>Union</em><em>[</em><aclass="reference internal" href="../core/universe.html#MDAnalysis.core.universe.Universe" title="MDAnalysis.core.universe.Universe"><em>Universe</em></a><em>, </em><aclass="reference internal" href="../core/groups.html#MDAnalysis.core.groups.AtomGroup" title="MDAnalysis.core.groups.AtomGroup"><em>AtomGroup</em></a><em>]</em>) – input Universe or AtomGroup with at least 6 protein residues. In both cases, only protein residues will
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be chosen prior to the analysis via <cite>select_atoms(‘protein’)</cite>.
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Heavy atoms of the protein are then selected by name
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<cite>heavyatom_names</cite>, and hydrogens are selected by name
<ddclass="field-even"><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – if <codeclass="docutils literal notranslate"><spanclass="pre">guess_hydrogens</span></code> is True but some non-PRO hydrogens are missing.</p>
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<ddclass="field-even"><ulclass="simple">
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<li><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – If fewer than 6 residues are provided in the selection.</p></li>
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<li><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – if <codeclass="docutils literal notranslate"><spanclass="pre">guess_hydrogens</span></code> is True but some non-PRO hydrogens are missing.</p></li>
<spanclass="sig-name descname"><spanclass="pre">DEFAULT_ACCEPTORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('O',</span><spanclass="pre">'OC2',</span><spanclass="pre">'OE1',</span><spanclass="pre">'OW',</span><spanclass="pre">'ND1',</span><spanclass="pre">'OG',</span><spanclass="pre">'OE2',</span><spanclass="pre">'SG',</span><spanclass="pre">'OC1',</span><spanclass="pre">'OH',</span><spanclass="pre">'SD',</span><spanclass="pre">'NE2',</span><spanclass="pre">'OG1',</span><spanclass="pre">'OH2',</span><spanclass="pre">'OD1',</span><spanclass="pre">'OD2'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('O',</span><spanclass="pre">'OH',</span><spanclass="pre">'O2',</span><spanclass="pre">'NT',</span><spanclass="pre">'SM',</span><spanclass="pre">'OW',</span><spanclass="pre">'N',</span><spanclass="pre">'OS',</span><spanclass="pre">'OY'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_ACCEPTORS" title="Link to this definition"></a></dt>
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<spanclass="sig-name descname"><spanclass="pre">DEFAULT_ACCEPTORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OC2',</span><spanclass="pre">'OE2',</span><spanclass="pre">'O',</span><spanclass="pre">'NE2',</span><spanclass="pre">'OG1',</span><spanclass="pre">'OD1',</span><spanclass="pre">'OC1',</span><spanclass="pre">'OW',</span><spanclass="pre">'OD2',</span><spanclass="pre">'OG',</span><spanclass="pre">'OH',</span><spanclass="pre">'OH2',</span><spanclass="pre">'SD',</span><spanclass="pre">'OE1',</span><spanclass="pre">'ND1',</span><spanclass="pre">'SG'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('NT',</span><spanclass="pre">'OS',</span><spanclass="pre">'OW',</span><spanclass="pre">'O',</span><spanclass="pre">'OH',</span><spanclass="pre">'N',</span><spanclass="pre">'OY',</span><spanclass="pre">'SM',</span><spanclass="pre">'O2'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_ACCEPTORS" title="Link to this definition"></a></dt>
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<dd><p>default atom names that are treated as hydrogen <em>acceptors</em>
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(see <aclass="reference internal" href="#default-atom-names-for-water-bridge-analysis"><spanclass="std std-ref">Default heavy atom names for CHARMM27 force field.</span></a>);
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use the keyword <cite>acceptors</cite> to add a list of additional acceptor names.</p>
<spanclass="sig-name descname"><spanclass="pre">DEFAULT_DONORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OH',</span><spanclass="pre">'NE',</span><spanclass="pre">'NE1',</span><spanclass="pre">'NH1',</span><spanclass="pre">'OW',</span><spanclass="pre">'NE2',</span><spanclass="pre">'N',</span><spanclass="pre">'ND1',</span><spanclass="pre">'ND2',</span><spanclass="pre">'OG',</span><spanclass="pre">'OG1',</span><spanclass="pre">'NZ',</span><spanclass="pre">'SG',</span><spanclass="pre">'OH2',</span><spanclass="pre">'NH2'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('OH',</span><spanclass="pre">'N',</span><spanclass="pre">'N3',</span><spanclass="pre">'NT',</span><spanclass="pre">'OW'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_DONORS" title="Link to this definition"></a></dt>
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<spanclass="sig-name descname"><spanclass="pre">DEFAULT_DONORS</span></span><emclass="property"><spanclass="w"></span><spanclass="p"><spanclass="pre">=</span></span><spanclass="w"></span><spanclass="pre">{'CHARMM27':</span><spanclass="pre">('OW',</span><spanclass="pre">'ND2',</span><spanclass="pre">'NH2',</span><spanclass="pre">'NZ',</span><spanclass="pre">'NE1',</span><spanclass="pre">'OG',</span><spanclass="pre">'OH',</span><spanclass="pre">'N',</span><spanclass="pre">'OH2',</span><spanclass="pre">'NE2',</span><spanclass="pre">'OG1',</span><spanclass="pre">'NE',</span><spanclass="pre">'ND1',</span><spanclass="pre">'SG',</span><spanclass="pre">'NH1'),</span><spanclass="pre">'GLYCAM06':</span><spanclass="pre">('NT',</span><spanclass="pre">'OH',</span><spanclass="pre">'OW',</span><spanclass="pre">'N',</span><spanclass="pre">'N3'),</span><spanclass="pre">'other':</span><spanclass="pre">()}</span></em><aclass="headerlink" href="#MDAnalysis.analysis.hydrogenbonds.wbridge_analysis.WaterBridgeAnalysis.DEFAULT_DONORS" title="Link to this definition"></a></dt>
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<dd><p>default heavy atom names whose hydrogens are treated as <em>donors</em>
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(see <aclass="reference internal" href="#default-atom-names-for-water-bridge-analysis"><spanclass="std std-ref">Default heavy atom names for CHARMM27 force field.</span></a>);
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use the keyword <cite>donors</cite> to add a list of additional donor names.</p>
<spanclass="s2">"DSSP requires at least 6 residues for secondary structure analysis, "</span>
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<spanclass="sa">f</span><spanclass="s2">"but only </span><spanclass="si">{</span><spanclass="nb">len</span><spanclass="p">(</span><spanclass="n">ag</span><spanclass="o">.</span><spanclass="n">residues</span><spanclass="p">)</span><spanclass="si">}</span><spanclass="s2"> residue(s) were provided in the selection."</span>
<li><p><strong>atoms</strong> (<em>Union</em><em>[</em><aclass="reference internal" href="../core/universe.html#MDAnalysis.core.universe.Universe" title="MDAnalysis.core.universe.Universe"><em>Universe</em></a><em>, </em><aclass="reference internal" href="../core/groups.html#MDAnalysis.core.groups.AtomGroup" title="MDAnalysis.core.groups.AtomGroup"><em>AtomGroup</em></a><em>]</em>) – input Universe or AtomGroup. In both cases, only protein residues will
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<li><p><strong>atoms</strong> (<em>Union</em><em>[</em><aclass="reference internal" href="../core/universe.html#MDAnalysis.core.universe.Universe" title="MDAnalysis.core.universe.Universe"><em>Universe</em></a><em>, </em><aclass="reference internal" href="../core/groups.html#MDAnalysis.core.groups.AtomGroup" title="MDAnalysis.core.groups.AtomGroup"><em>AtomGroup</em></a><em>]</em>) – input Universe or AtomGroup with at least 6 protein residues. In both cases, only protein residues will
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be chosen prior to the analysis via <cite>select_atoms(‘protein’)</cite>.
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Heavy atoms of the protein are then selected by name
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<cite>heavyatom_names</cite>, and hydrogens are selected by name
<ddclass="field-even"><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – if <codeclass="docutils literal notranslate"><spanclass="pre">guess_hydrogens</span></code> is True but some non-PRO hydrogens are missing.</p>
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<ddclass="field-even"><ulclass="simple">
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<li><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – If fewer than 6 residues are provided in the selection.</p></li>
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<li><p><aclass="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.14)"><strong>ValueError</strong></a> – if <codeclass="docutils literal notranslate"><spanclass="pre">guess_hydrogens</span></code> is True but some non-PRO hydrogens are missing.</p></li>
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