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Protein display options
... ball and stick ... wireframe ... trace ... cartoon ... spacefill ... Primary structure Colour each amino acid .... Show residue numbers .... Show residue names ... Remove labels & restore default colours Secondary structure Cartoon format - a helices red, ß sheets gold Note especially the central barrel-shaped section through which the substrate presumably passes as it is fed into the active site.
Tertiary structure
(protein) Molecular surface on .... Molecular surface off Active site Rotate molecule to look down into active site The following amino acid residues have been identified (reference below) as contributing to the conversion of glucose polysaccharides (amylose, starch) into disacccharides (maltose). Interestingly, they all have acidic side-chains (aspartic acid and glutamic acid). Show / hide ASP 197, GLU 233 & ASP300 at active site (white spacefill) Show / hide glucose dimer (maltose - the product of starch hydrolysis) red and grey |