Technical Data
Natural Resistance Associated Macrophage Protein (Nramp2)
Natural resistance to infection with unrelated intracellular parasite such as Mycobacteria, Salmonella, and Leishmania is controlled by a single gene that encodes a macrophage-specific membrane protein designated as Natural Resistance-Associated Macrophage Protein (Nramp1). Recently a second member of NRAMP family, termed NRAMP2/DMT/DCT1 (Divalent Metal ion Transporter 1 or Divalent Cation Transporter 1), has been identified (human, rat and mouse 568 aa, ~65% identity with NRAMP1). Unlike NRAMP1, NRAMP2 expression is more ubiquitous and has been detected in most tissues. It is dramatically up-regulated by iron starvation in the intestine. NRAMP2 gene produces two alternatively spliced transcripts generated by alternative use of two 3' exons encoding distinct C-termini of the protein as well as distinct 3' untranslated regions (UTRs). Interestingly, one Nramp2 mRNA contains an iron-responsive element (IRE) in its 3'UTR. The IRE is an RNA secondary structure present in the 5'- or the 3'-UTR of animal mRNAs encoding proteins involved in iron metabolism. The second Nramp2 splice isoform (without-IRE, isoform II) encodes a protein in which the C-terminal 18-aa of the IRE form (with IRE, isoform I) are replaced by a novel 25-aa segment and codes for a distinct 3' UTR lacking the IRE. The two isoforms are differentially localized and regulated in GI tract and kidney. It has recently been demonstrated that the Nramp2 gene is mutated (Gly185 to Arg at TM4) in both the mk and Belgarde (b) animal models exhibiting a severe microcytic hypochromic anemia marked by a defect in iron absorption by intestinal cells and in erythroid iron use.

Suitable for use in ELISA and Western Blot. Other applications not tested.

Recommended Dilutions:
Western Blot: 1:1000-1:5000 (ECL)
ELISA: 1:10,000-50,000
Optimal dilutions to be determined by the researcher.

Storage and Stability:
May be stored at 4C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20C. Aliquots are stable for 12 months after receipt. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.
50ul-20CBlue IceHumanRabbit
Not Determined
Synthetic peptide corresponding to 17aa near the C-Terminal, cytoplasmic domain of human NRAMP1, conjugated to KLH. Species Sequence Homology: monkey NRAMP1 with IRE, 88%
Supplied as a liquid, in PBS 0.05% sodium azide
Recognizes human NRAMP1. No significant sequence homology exists with NRAMP1 in mouse or rat
Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.
1. Gunshin H et al (1997) Nature 388, 482; Fleming MD et al (1998) PNAS 95, 1148. 2. Kishi F et al (1997) Mol Immunol. 6, 224. 3. Gruenshield S et al (1995) Genomics 25, 514. 4. Fleming MD et al (1997) Nature Genet. 16, 383. 5. Canonne-Hergaux F et al (1999) Blood 93, 4406