title: The metal-free hydrogenase from methanogenic archaea: evidence for a bound cofactor.
abstract: The hmd gene, which encodes the metal-free hydrogenase in methanogenic archaea, was heterologously expressed in Escherichia coli. The overproduced enzyme was completely inactive. High activity could, however, be induced by the addition of ultrafiltrate from active enzyme denatured in 8 M urea. The active fraction in the ultrafiltrate was heat-labile and migrated on gel filtration columns with an apparent molecular mass well below 1000 Da.
authors.affiliation: Max-Planck-Institut für terrestrische Mikrobiologie, D-35043 Marburg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Buurman
authors.forename: S
authors.initials: S
authors.lastname: Shima
authors.forename: R K
authors.initials: RK
authors.lastname: Thauer
mesh_terms: D002850:Chromatography, Gel; D004795:Enzyme Stability; D004926:Escherichia coli / Q000235:genetics; D019605:Euryarchaeota / Q000201:enzymology*; D015870:Gene Expression; D006358:Hot Temperature; D006864:Hydrogenase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D008970:Molecular Weight; D011489:Protein Denaturation; D020673:Protein Renaturation; D014462:Ultrafiltration; D014508:Urea
chemical_list: D014508:Urea; D006864:Hydrogenase