>> Would sombody please clue me in on what this enzyme's funtion is. I'm
> having a hard time researching it, when I don't know where/what it is.
>> I will be most appreciative!!!
Here are some references on hydrogenases(not so difficult to find, IMO):
The structure and mechanism of iron hydrogenases, MWW Adams, Biochim.
Biphys. Acta, vol 1020, 115-145 (1990)
Microbial hydrogenases: primary structure, classification, signatures
and phylogeny, LF Wu and MA Mandrand, FEMS Microbiology Reviews, vol.
10, 243-270 (1993)
Nickel hydrogenases: in search of the active site, SPJ Albracht,Biochim.
Biphys. Acta, vol. 1188, 167-204 (1994)
Biochemical and molecular genetic basis of hydrogenases, D. Hahn and U
Kueck, Process Biochemistry, vol. 29,633-644 (1994).
Crystal structure of the nickel-iron hydrogenase from Desulfovibrio
gigas, A. Volbeda et. al., Nature, vol. 373, 580-587(1995).
Hope this helps,