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netLibrary - eBook Summary Structure-based Drug Design by ...

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Important for the validity of the models that we constructed is the evidence from models of other<br />

proteins indicating that two proteins can have as little as 20 to 25% sequence identity and still have very<br />

similar 3D structures, especially in α helices and β stands [49–52]. Variation is found in the loops and<br />

coiled structures. A relevant example for this chapter is the comparison of the tertiary structure of rat<br />

dihydropteridine reductase [33] and Streptomyces hydrogenans 20β-hydroxysteroid dehydrogenase [34].<br />

As noted <strong>by</strong> Varughese et al. [33], despite less than 20% sequence identity between dihydropteridine<br />

reductase and<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_197.html (2 of 2) [4/5/2004 5:05:25 PM]

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