1am7

Lysozyme from bacteriophage lambdaLysozyme from bacteriophage lambda

Structural highlights 1am7 is a 3 chain structure with sequence from Bacteriophage lambda. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NonStd Res: Gene: R (Bacteriophage lambda) Activity: Lysozyme, with EC number 3.2.1.17 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [LYS_LAMBD] Essential for lysis of bacterial cell wall, by showing cell wall hydrolyzing activity. Acts as a transglycosylase. Cleaves glycosidic bonds between the C1 of N-acetyl muramic acids (NAM) and C4 of N-acetyl glucosamines (NAG) of the peptidoglycan of the bacterial walls. 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 Like other lysozymes, the bacteriophage lambda lysozyme is involved in the digestion of bacterial walls. This enzyme is remarkable in that its mechanism of action is different from the classical lysozyme's mechanism. From the point of view of protein evolution, it shows features of lysozymes from different classes. The crystal structure of the enzyme in which all tryptophan residues have been replaced by aza-tryptophan has been solved by X-ray crystallography at 2.3 A using a combination of multiple isomorphous replacement, non-crystallographic symmetry averaging and density modification techniques. There are three molecules in the asymmetric unit. The characteristic structural elements of lysozymes are conserved: each molecule is organized in two domains connected by a helix and the essential catalytic residue (Glu19) is located in the depth of a cleft between the two domains. This cleft shows an open conformation in two of the independent molecules, while access to the cavity is much more restricted in the last one. A structural alignment with T4 lysozyme and hen egg white lysozyme allows us to superpose about 60 C alpha atoms with a rms distance close to 2 A. The best alignments concern the helix preceding the catalytic residue, some parts of the beta sheets and the helix joining the two domains. The results of sequence alignments with the V and C lysozymes, in which weak local similarities had been detected, are compared with the structural results. Crystal structure of the lysozyme from bacteriophage lambda and its relationship with V and C-type lysozymes.,Evrard C, Fastrez J, Declercq JP J Mol Biol. 1998 Feb 13;276(1):151-64. PMID:9514719 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lysozyme 3D structures

spinqualitylabelsall models 1am7, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image