What to you mean by stereospecifity of enzyme?
There can be many optical isomers of a substrate. However, it is only one of the isomers which acts as a substrate for enzyme action eg.; for hydrolysis of poplypeptides at D- and L- amino acids- there are two types of enzyme needed which will act on D- and L- isomers of amino acids. Trypsin readily hydrolyzes polypeptides composed of L- amino acids but not those consisting of D- amino acids.
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