13th International Congress of Biochemistry

Cytochrome caa₃ (cytochrome oxidase) from the thermophilic bacterium PS3 can exhibit full catalytic activity in the presence of ascorbate and TMPD or other electron donors and in the absence of added soluble c-type cytochromes. It appears to possess only a low-affinity and not a high-affinity site for the soluble cytochromes. Proteoliposomal cytochrome caa₃ develops an effective membrane potential in the presence of ascorbate and TMPD or PMS, in the absence of added soluble cytochrome c. Reduction of the a₃ centre is blocked in the presence of cyanide. During reductive titrations of the cyanide-inhibited enzyme, electrons initially equilibrate among three centres, the c haem, the a haem and one of the associated Cu atoms. During steady-state turnover, electrons probably enter the complex via the bound c haem; the a haem and perhaps an associated Cu_A atom are reduced next. It is concluded that, despite its size and hydrophobic association with the aa₃ complex, the haem c-containing subunit can behave in an analogous way to that of mammalian cytochrome c, bound at the high-affinity site of the eucaryotic enzyme.     

第十三届国际光生物学大会简介

第十三届国际光生物学大会 (１３Ｔｈ ＩｎｔｅｒｎａｔｉｏｎａｌＣｏｎｇｒｅｓｓｏｎＰｈｏｔｏｂｉｏｌｏｇｙ)由国际光生物学协会 (ＡｓｓｏｃｉａｔｉｏｎＩｎｔｅｒｎａｔｉｏｎａｌｅｄｅＰｈｏｔｏｂｉｏｌｏｇｉｅ,ＡＩＰ)主办 ,美国光生物学会承办 ,日本、韩国、欧洲光生物学会协办 ,于２０００年７月１ -６日在旧金山举行。会议有１０００多位科学家参加 ,全面介绍了光生物学各个学科的进展 ,及其在医学、环境、农业等领域的应用。会议共安排了１０个大会报告 ,组织了５５个专题会议 ,安排１４场口头发言 ,３个时间段的墙报展…     

15th International Cancer Congress

Meeting announcement

15th International Cancer Congress