Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218, and Polymers Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899.
Appl Environ Microbiol. 1990 May;56(5):1255-62. doi: 10.1128/aem.56.5.1255-1262.1990.
Polysulfides formed through the breakdown of elemental sulfur or other sulfur compounds were found to be reduced to H(2)S by the hyperthermophilic archaebacterium Pyrococcus furiosus during growth. Metabolism of polysulfides by the organism was dissimilatory, as no incorporation of S-labeled elemental sulfur was detected. However, [S]cysteine and [S]methionine were incorporated into cellular protein. Contact between the organism and elemental sulfur is not necessary for metabolism. The sulfide generated from metabolic reduction of polysulfides dissociates to a strong nucleophile, HS, which in turn opens up the S(8) elemental sulfur ring. In addition to H(2)S, P. furiosus cultures produced methyl mercaptan in a growth-associated fashion.
通过高温古菌 Pyrococcus furiosus 的生长，发现通过元素硫或其他硫化合物的分解形成的多硫化物被还原为 H(2)S。该生物体对多硫化物的代谢是异化的，因为没有检测到 S 标记的元素硫的掺入。然而，[S]半胱氨酸和[S]蛋氨酸被掺入到细胞蛋白中。生物体与元素硫之间的接触不是代谢所必需的。多硫化物代谢还原产生的硫化物离解为强亲核试剂 HS，HS 继而打开 S(8)元素硫环。除了 H(2)S，P. furiosus 培养物以生长相关的方式产生甲硫醇。
