1ckc

<StructureSection load='1ckc' size='340' side='right' caption='[[1ckc]], [[Resolution|resolution]] 1.80&Aring;' scene=''>

<table><tr><td colspan='2'>[[1ckc]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CKC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CKC FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Lysozyme Lysozyme], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.17 3.2.1.17] </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=1ckc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ckc OCA], [http://pdbe.org/1ckc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ckc RCSB], [http://www.ebi.ac.uk/pdbsum/1ckc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ckc ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/LYSC_HUMAN LYSC_HUMAN]] Defects in LYZ are a cause of amyloidosis type 8 (AMYL8) [MIM:[http://omim.org/entry/105200 105200]]; also known as systemic non-neuropathic amyloidosis or Ostertag-type amyloidosis. AMYL8 is a hereditary generalized amyloidosis due to deposition of apolipoprotein A1, fibrinogen and lysozyme amyloids. Viscera are particularly affected. There is no involvement of the nervous system. Clinical features include renal amyloidosis resulting in nephrotic syndrome, arterial hypertension, hepatosplenomegaly, cholestasis, petechial skin rash.<ref>PMID:8464497</ref>

[[http://www.uniprot.org/uniprot/LYSC_HUMAN LYSC_HUMAN]] Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents.

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== Publication Abstract from PubMed ==

In globular proteins, there are intermolecular hydrogen bonds between protein and water molecules, and between water molecules, which are bound with the proteins, in addition to intramolecular hydrogen bonds. To estimate the contribution of these hydrogen bonds to the conformational stability of a protein, the thermodynamic parameters for denaturation and the crystal structures of five Thr to Val and five Thr to Ala mutant human lysozymes were determined. The denaturation Gibbs energy (DeltaG) of Thr to Val and Thr to Ala mutant proteins was changed from 4.0 to -5.6 kJ/mol and from 1.6 to -6.3 kJ/mol, respectively, compared with that of the wild-type protein. The contribution of hydrogen bonds to the stability (DeltaDeltaG(HB)) of the Thr and other mutant human lysozymes previously reported was extracted from the observed stability changes (DeltaDeltaG) with correction for changes in hydrophobicity and side chain conformational entropy between the wild-type and mutant structures. The estimation of the DeltaDeltaG(HB) values of all mutant proteins after removal of hydrogen bonds, including protein-water hydrogen bonds, indicates a favorable contribution of the intra- and intermolecular hydrogen bonds to the protein stability. The net contribution of an intramolecular hydrogen bond (DeltaG(HB[pp])), an intermolecular one between protein and ordered water molecules (DeltaG(HB[pw])), and an intermolecular one between ordered water molecules (DeltaG(HB[ww])) could be estimated to be 8. 5, 5.2, and 5.0 kJ/mol, respectively, for a 3 A long hydrogen bond. This result shows the different contributions to protein stability of intra- and intermolecular hydrogen bonds. The entropic cost due to the introduction of a water molecule (DeltaG(H)()2(O)) could be also estimated to be about 8 kJ/mol.

Contribution of intra- and intermolecular hydrogen bonds to the conformational stability of human lysozyme(,).,Takano K, Yamagata Y, Funahashi J, Hioki Y, Kuramitsu S, Yutani K Biochemistry. 1999 Sep 28;38(39):12698-708. PMID:10504240<ref>PMID:10504240</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 1ckc" style="background-color:#fffaf0;"></div>

[[Category: Human]]

[[Category: Lysozyme]]

[[Category: Funahashi, J]]

[[Category: Takano, K]]

[[Category: Yamagata, Y]]

[[Category: Yutani, K]]

[[Category: Stability]]