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Salminen, T.A. et al.

Salminen, Smith, Jalkanen, Johnson,

Structural model of the catalytic domain of an enzyme with cell adhesion activity: human vascular adhesion protein-1 (HVAP-1) D4 domain is an amine oxidase.

Human vascular adhesion protein-1 (HVAP-1) is a multifunctional protein having at least two different cellular roles, functioning both as a lymphocyte-endothelial cell adhesion protein and as an enzyme with monoamine oxidase activity. HVAP-1 is a 180 kDa homodimeric glycoprotein consisting of a membrane-spanning domain and three predicted extracellular copper-containing amine oxidase domains. In HVAP-1 the extracellular domains are composed of a large domain D4, containing the active site and forming the interface of the dimer, while the smaller D2 and D3 domains surround the D4 dimer near the entrance to the active site. The structural model of the catalytic D4 domain of HVAP-1 reveals that all components necessary for enzymatic monoamine oxidase activity are indeed present within the HVAP-1 and pinpoints residues that may be key to substrate entry through a channel to the active site and residues likely to be involved in substrate specificity as well as structural features critical to dimer formation. Proper glycosylation is required for the cell adhesion function of HVAP-1 and the predicted location of the sugar units at the solvent-exposed surface suits this function well.[1]

References

Structural model of the catalytic domain of an enzyme with cell adhesion activity: human vascular adhesion protein-1 (HVAP-1) D4 domain is an amine oxidase. Salminen, T.A., Smith, D.J., Jalkanen, S., Johnson, M.S. Protein Eng. (1998) [Pubmed]

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