1c7p

CRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME WITH FOUR EXTRA RESIDUES (EAEA) AT THE N-TERMINALCRYSTAL STRUCTURE OF MUTANT HUMAN LYSOZYME WITH FOUR EXTRA RESIDUES (EAEA) AT THE N-TERMINAL

Structural highlights 1c7p is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Related: 1c43, 1c45, 1c46 Activity: Lysozyme, with EC number 3.2.1.17 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Disease [LYSC_HUMAN] Defects in LYZ are a cause of amyloidosis type 8 (AMYL8) [MIM: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. Function [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. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed A human lysozyme expression system by Pichia pastoris was constructed with the expression vector of pPIC9, which contains the alpha-factor signal peptide known for high secretion efficiency. P. pastoris expressed the human lysozyme at about 300 mg/l broth, but four extra residues (Glu(-4)-Ala(-3)-Glu(-2)-Ala(-1)-) were added at the N-terminus of the expressed protein (EAEA-lysozyme). To determine the effect of the four extra residues on the stability, structures and folding of the protein, calorimetry, X-ray crystal analysis and GuHCl denaturation experiments were performed. The calorimetric studies showed that the EAEA-lysozyme was destabilized by 9.6 kJ/mol at pH 2.7 compared with the wild-type protein, mainly caused by the substantial decrease in the enthalpy change (DeltaH). On the basis of structural information on the EAEA-lysozyme, thermodynamic analyses show that (1) the addition of the four residues slightly affected the conformation in other parts far from the N-terminus, (2) the large decrease in the enthalpy change due to the conformational changes would be almost compensated by the decrease in the entropy change and (3) the decrease in the Gibbs energy change between the EAEA and wild-type human lysozymes could be explained by the summation of each Gibbs energy change contributing to the stabilizing factors concerning the extra residues. Effect of extra N-terminal residues on the stability and folding of human lysozyme expressed in Pichia pastoris.,Goda S, Takano K, Yamagata Y, Katakura Y, Yutani K Protein Eng. 2000 Apr;13(4):299-307. PMID:10810162 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lysozyme 3D structures

spinqualitylabelsall models 1c7p, resolution 2.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image