Loss of rapid transferrin receptor recycling due to a mutation in Sec15l1 in hbd mice.
The hbd (hemoglobin deficit) mutation affects iron trafficking in murine reticulocytes. It is due to a deletion that eliminates exon 8 of Sec15l1, the homolog of a gene that encodes an exocyst component in yeast. We tested the hypothesis that the mutation causes defective slow or rapid receptor recycling by measuring endocytosis and exocytosis of transferrin by hbd reticulocytes. Endocytosis and initial iron incorporation were relatively unaffected, but exocytosis was unexpectedly slowed. These data indicate that rapid transferrin recycling is defective after pSec15l1 has mutated.
Garrick
Michael D
MD
Department of Biochemistry, School of Medicine and Biomedical Sciences, SUNY, Buffalo, NY 14214, USA. mgarrick@baffalo.edu
Garrick
Laura M
LM
D000818:Animals; D004705:Endocytosis; D005089:Exocytosis; D006454:Hemoglobins / Q000172:deficiency*; D007457:Iodine Radioisotopes; D007501:Iron / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008817:Mice, Mutant Strains; D009154:Mutation / Q000235:genetics*; D011990:Receptors, Transferrin / Q000378:metabolism*; D012156:Reticulocytes / Q000378:metabolism; D013997:Time Factors
D006454:Hemoglobins; D007457:Iodine Radioisotopes; D008565:Membrane Proteins; D011990:Receptors, Transferrin; C506790:Sec15 protein, mouse; D007501:Iron