Details

Autor(en) / Beteiligte

• Nishito, Yukina
• Tsuji, Natsuko
• Fujishiro, Hitomi
• Takeda, Taka-aki
• Yamazaki, Tomohiro
• Teranishi, Fumie
• Okazaki, Fumiko
• Matsunaga, Ayu
• Tuschl, Karin
• Rao, Rajini
• Kono, Satoshi
• Miyajima, Hiroaki
• Narita, Hiroshi
• Himeno, Seiichiro
• Kambe, Taiho

Titel

Direct Comparison of Manganese Detoxification/Efflux Proteins and Molecular Characterization of ZnT10 Protein as a Manganese Transporter

Ist Teil von

• The Journal of biological chemistry, 2016-07, Vol.291 (28), p.14773-14787

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• Manganese homeostasis involves coordinated regulation of specific proteins involved in manganese influx and efflux. However, the proteins that are involved in detoxification/efflux have not been completely resolved nor has the basis by which they select their metal substrate. Here, we compared six proteins, which were reported to be involved in manganese detoxification/efflux, by evaluating their ability to reduce manganese toxicity in chicken DT40 cells, finding that human ZnT10 (hZnT10) was the most significant contributor. A domain swapping and substitution analysis between hZnT10 and the zinc-specific transporter hZnT1 showed that residue Asn43, which corresponds to the His residue constituting the potential intramembranous zinc coordination site in other ZnT transporters, is necessary to impart hZnT10's unique manganese mobilization activity; residues Cys52 and Leu242 in transmembrane domains II and V play a subtler role in controlling the metal specificity of hZnT10. Interestingly, the His → Asn reversion mutant in hZnT1 conferred manganese transport activity and loss of zinc transport activity. These results provide important information about manganese detoxification/efflux mechanisms in vertebrate cells as well as the molecular characterization of hZnT10 as a manganese transporter.