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{{enzyme
| Name = cis-3,4-dihydrophenanthrene-3,4-diol dehydrogenase
| EC_number = 1.3.1.49
| CAS_number = 118390-61-7
| IUBMB_EC_number = 1/3/1/49
| GO_code = 0018507
| image = 
| width = 
| caption = 
}}
In [[enzymology]], a '''cis-3,4-dihydrophenanthrene-3,4-diol dehydrogenase''' ({{EC number|1.3.1.49}}) is an [[enzyme]] that [[catalysis|catalyzes]] the [[chemical reaction]]

:(+)-cis-3,4-dihydrophenanthrene-3,4-diol + NAD<sup>+</sup> <math>\rightleftharpoons</math> phenanthrene-3,4-diol + NADH + H<sup>+</sup>

Thus, the two [[substrate (biochemistry)|substrates]] of this enzyme are [[(+)-cis-3,4-dihydrophenanthrene-3,4-diol]] and [[nicotinamide adenine dinucleotide|NAD<sup>+</sup>]], whereas its 3 [[product (chemistry)|products]] are [[phenanthrene-3,4-diol]], [[nicotinamide adenine dinucleotide|NADH]], and [[hydrogen ion|H<sup>+</sup>]].

This enzyme belongs to the family of [[oxidoreductase]]s, specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor.  The systematic name of this enzyme class is '''(+)-cis-3,4-dihydrophenanthrene-3,4-diol:NAD+ 3,4-oxidoreductase'''. This enzyme participates in [[naphthalene and anthracene degradation]].  

==References==
{{reflist|1}}
* {{cite journal | author = Nagao K, Takizawa N and Kiyahara H | date = 1988 | title = Purification and properties of cis-phenanthrene dihydrodiol dehydrogenase in Alcaligenes faecalis AFK2 | journal = Agric. Biol. Chem.  | volume = 52 | pages = 2621&ndash;2623 | doi = 10.1271/bbb1961.52.2621 | issue = 10 }}

{{1.3-enzyme-stub}}

[[Category:EC 1.3.1]]
[[Category:NADH-dependent enzymes]]
[[Category:Enzymes of unknown structure]]