Take the 2-minute tour ×
Biology Stack Exchange is a question and answer site for biology researchers, academics, and students. It's 100% free, no registration required.

RNA is known to act as an enzyme via its ability to fold itself in specific ways.

Is DNA capable of such structures? Or is it some biochemical reason stopping the folding? Have they been observed in nature?

share|improve this question
add comment

2 Answers 2

up vote 8 down vote accepted

There are no known natural DNA enzymes (deoxyribozymes), but there are various synthetic DNA enzymes. The first deoxyribozyme that has been reported (Breaker and Joyce, 1994) catalyzed the Pb2+-dependant cleavage of RNA.

Various deoxyribozymes have been synthesized, they can catalyze RNA cleavage, RNA ligation and many other reactions like DNA phosphorylation or Thymine dimer photoreversion, and even a Diels-Alder reaction (see Baum and Silverman, 2008 for a review).

DNA lacks the 2'-hydroxyl group that RNA posesses, but there is some evidence that this doesn't significantly decrease the potential of deoxyribozymes compared to ribozymes. In one experiment DNA and RNA enzymes that catalyze a Carbon-Carbon bond formation were compared and both achieved comparable catalytic rates (Chandra and Silverman, 2008).

For more information about DNA enzymes you can look at the publications from the Silverman lab, they're probably the most active research group in this field.


share|improve this answer
add comment

DNA has recently been designed to act as a targeted drug-delivery agent at George Church's lab. This doesn't involve catalyzing a reaction between two substrates, but it does involve significant internal conformational changes based on binding to highly specific substrates.

http://www.sciencemag.org/content/335/6070/831.abstract

share|improve this answer
    
This isn't a ribozyme at all. –  bobthejoe Feb 22 '12 at 18:35
    
@bobthejoe It's not a ribozyme, but it does demonstrate a parallel flexibility of conformation and function to ribozymes. Part of the question addresses whether there is a biochemical reason "stopping the folding". –  Thomas Ingalls Feb 23 '12 at 18:24
2  
In that regard, you should really cite Ned Seeman's work. The DNA in the box and the DNA origami work better reflect the conformational flexibility of higher ordered DNA structure. I would believe that the alternative discussion in biology.stackexchange.com/questions/287/… better describes the limitations of DNA in achieving these non-canonical structures. –  bobthejoe Feb 24 '12 at 4:37
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.