Molecular evidence for the role of a ferric reductase in iron transport.

نویسندگان

  • A T McKie
  • G O Latunde-Dada
  • S Miret
  • J A McGregor
  • G J Anderson
  • C D Vulpe
  • J M Wrigglesworth
  • R J Simpson
چکیده

Duodenal cytochrome b (Dcytb) is a haem protein similar to the cytochrome b561 protein family. Dcytb is highly expressed in duodenal brush-border membrane and is implicated in dietary iron absorption by reducing dietary ferric iron to the ferrous form for transport via Nramp2/DCT1 (divalent-cation transporter 1)/DMT1 (divalent metal-transporter 1). The protein is expressed in other tissues and may account for ferric reductase activity at other sites in the body.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Chloroplast Fe(III) chelate reductase activity is essential for seedling viability under iron limiting conditions.

Photosynthesis, heme biosynthesis, and Fe-S cluster assembly all take place in the chloroplast, and all require iron. Reduction of iron via a membrane-bound Fe(III) chelate reductase is required before iron transport across membranes in a variety of systems, but to date there has been no definitive genetic proof that chloroplasts have such a reduction system. Here we report that one of the eigh...

متن کامل

Iron acquisition by teleost fish.

Iron is a vital micronutrient for teleost fish, being an integral component of proteins involved in cellular respiration and oxygen transfer. However, in excess iron is toxic, and fish need to balance uptake to prevent deficiency vs. potential toxicity. This review assesses the current physiological and molecular knowledge of the mechanisms of iron acquisition in the teleost fish. It focuses on...

متن کامل

Iron Uptake by Symbiosomes from Soybean Root Nodules.

To identify possible iron sources for bacteroids in planta, soybean (Glycine max L. Merr.) symbiosomes (consisting of the bacteroid-containing peribacteroid space enclosed by the peribacteroid membrane [PBM]) and bacteroids were assayed for the ability to transport iron supplied as various ferric [Fe(III)]-chelates. Iron presented as a number of Fe(III)-chelates was transported at much higher r...

متن کامل

Genetic and physiologic characterization of ferric/cupric reductase constitutive mutants of Cryptococcus neoformans.

Cryptococcus neoformans is a pathogenic yeast that causes meningitis in immunocompromised patients. Because iron acquisition is critical for growth of a pathogen in a host, we studied the regulation of the ferric reductase and ferrous uptake system of this organism. We isolated 18 mutants, representing four independent loci, with dysregulated ferric reductase. The mutant strains had >10-fold hi...

متن کامل

The reduction of inorganic iron and cytochrome c by flavin enzymes.

During the course of an investigation of the components involved in the electron transport pathway in Pseudomonas $uorescens (1)) the problem arose as to the nature of the carriers mediating the transfer of electrons between the diaphorase and bacterial cytochrome c. Mahler and Elowe (2) have reported the involvement of iron as a component of the DPNH’ cytochrome c reductase from pig heart. Rem...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • Biochemical Society transactions

دوره 30 4  شماره 

صفحات  -

تاریخ انتشار 2002