SP-D Antibody (292201) [Unconjugated]

Recombinant Human SP‑D protein was serially diluted 2-fold and captured by Mouse Anti-Human SP‑D Monoclonal Antibody (Catalog # MAB19201) coated on a Clear Polystyrene Microplate (Catalog # DY990). Mouse Anti-Human SP‑D Monoclonal Antibody (Catalog # MAB1920) was biotinylated and incubated with the protein captured on the plate. Detection of the standard curve was achieved by incubating Streptavidin-HRP (Catalog # DY998) followed by Substrate Solution (Catalog # DY999) and stopping the enzymatic reaction with Stop Solution (Catalog # DY994).

• Reactivity: Hu
• Applications: WB, ELISA
• Clone: 292201
• Clonality: Monoclonal
• Host: Mouse
• Conjugate: Unconjugated
• Concentration: LYOPH

SP-D Antibody (292201) [Unconjugated] Summary

• Immunogen: Mouse myeloma cell line NS0-derived recombinant human SP-D
  Ala21-Phe375 (Glu22Gly)
  Accession # P35247.2
• Specificity: Detects human SP-D in direct ELISAs and Western blots.
• Source: N/A
• Isotype: IgG2b
• Clonality: Monoclonal
• Host: Mouse
• Gene: SFTPD
• Purity Statement: Protein A or G purified from hybridoma culture supernatant

Applications/Dilutions

• Dilutions:
  • ELISA
  • Western Blot 1 ug/mL

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
• Buffer: Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
• Preservative: No Preservative
• Concentration: LYOPH
• Reconstitution Instructions: Reconstitute at 0.5 mg/mL in sterile PBS.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for SP-D Antibody (292201) [Unconjugated]

• COLEC7collectin-7
• Collectin 7
• Collectin-7
• Lung surfactant protein D
• PSPD
• PSP-D
• SFTP4
• SFTP4pulmonary surfactant-associated protein D
• SFTPD
• SPD
• SP-D
• SP-Dpulmonary surfactant apoprotein
• surfactant protein D
• surfactant, pulmonary-associated protein D
• surfactant-associated protein, pulmonary 4

Background

SP-D (surfactant protein-D; also PSP-D) is a 43 kDa member of the collectin family of innate immune modulators. It is constitutively secreted by alveolar lining cells and epithelium associated with tubular structures. Its principal components consist of a collagen-like region and a C-terminal carbohydrate recognition domain (CRD), a structure that further places it in a subset of an expanded group of proteins termed defense collagens (1-4). Human SP-D is synthesized as a 375 amino acid (aa) precursor. It contains a 20 aa signal sequence and a 355 aa mature region. The mature molecule is characterized by the presence of a 25 aa N-terminal linking-region, a 177 aa hydroxyproline and hydroxylysine collagen-like domain, a 46 aa coiled-coil segment, and a 106 aa, C-terminal collectin-like C-type lectin domain (CRD) (5, 6). Two additional, potential isoforms exist. One shows a 13 aa N-terminal extension, while the other combines the N-terminal extension with a deletion of aa’s 206-375. Mature human SP-D shares 75% and 78% aa identity with mouse and pig SP-D, respectively. Monomeric SP-D is unusual (3). The basic form of SP-D is that of a glycosylated, disulfide-linked 150 kDa trimer that generates an alpha -helical coiled-coil structure linked to a “head” of three symmetrical CRDs (4, 7). Each CRD recognizes the hydroxides of one monosaccharide (4). Trimerization allows for the discrimination of monosaccharide patterns specific to microbial pathogens (7). Typically, SP-D forms a higher-order 620 kDa, X-shaped dodecamer through disulfide bonds associated with the N-terminus (8). This allows for even finer discrimination of self vs. nonself carbohydrate patterns, and facilitates binding to complex antigens (8, 9). One polymorphism, a Met11-Thr11 transition in human, apparently precludes the formation of oligomers, potentially affecting the ability of affected individuals to interact with microorganisms (9, 10). Finally, SP-D is known to bind both SIRP alpha and the calreticulin/CD91 complex on macrophages. When the ratio of antigen/pathogen to available CRDs is low, antigen can be bound without occupying all available CRDs. The free CRDs will bind to SIRP alpha , generating a signal that downmodulates the inflammatory response. When virtually all CRDs are occupied by ligand, however, free CRDs are not available for SIRP alpha binding. Instead, the dodecamer is depicted to undergo a structural rearrangement, exposing the N-termini of all four linked trimers. This exposed terminus is known to bind to the calreticulin/CD91 complex, an event that initiates inflammation. Thus, it would appear that SP-D allows for a graded response to environmental challenge. SP-D provides a mechanism for the clearance of small antigenic insults without the need for a damaging inflammatory response (3).

1. Holmskov, U. et. al. (2003) Annu. Rev. Immunol. 21:547.
2. Kishore, U. et. al. (2006) Mol. Immunol. 43:1293.
3. Hartl, D. and M. Griese (2006) Eur. J. Clin. Invest. 36:423.
4. Sim, R.B. et. al. (2006) Novartis Found Symp. 279:170.
5. Rust, K. et. al. (1991) Arch. Biochem. Biophys. 290:116.
6. Lu, J. et. al. (1992) Biochem. J. 284:795.
7. Hakansson, K. et. al. (1999) Structure 7:225.
8. Ohya, M. et. al. (2006) Biochemistry 45:8657.
9. Crouch, E.C. et. al. (2006) Am. J. Respir. Cell Mol. Biol. 35:84.
10. Leth-Larsen, R. et. al. (2005) J. Immunol. 174:1532.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Publications for SP-D Antibody (MAB1920)(5)

Publications using MAB1920

• Dellière, S;Chauvin, C;Wong, SSW;Gressler, M;Possetti, V;Parente, R;Fontaine, T;Krüger, T;Kniemeyer, O;Bayry, J;Carvalho, A;Brakhage, AA;Inforzato, A;Latgé, JP;Aimanianda, V; Interplay between host humoral pattern recognition molecules controls undue immune responses against Aspergillus fumigatus Nature communications 2024-08-14 [PMID: 39138196] (Immunohistochemistry, Fungus - Aspergillus fumigatus)
• Pin-Xian Du, Yi-Yu Chou, Harvey M. Santos, Batuhan Birol Keskin, Miao-Hsi Hsieh, Tzong-Shiann Ho et al. Development and Application of Human Coronavirus Protein Microarray for Specificity Analysis Analytical Chemistry 6/1/2021 [PMID: 34011150]
• Andrea A. Villanueva, Sofía Puvogel, Pablo Lois, Ernesto Muñoz-Palma, Manuel Ramírez Orellana, Fabiana Lubieniecki et al. The Netrin-4/Laminin gamma 1/Neogenin-1 complex mediates migration in SK-N-SH neuroblastoma cells Cell Adhesion & Migration 1/1/2019 [PMID: 30160193]
• Andrea A. Villanueva, Sofía Puvogel, Pablo Lois, Ernesto Muñoz-Palma, Manuel Ramírez Orellana, Fabiana Lubieniecki et al. The Netrin-4/Laminin gamma 1/Neogenin-1 complex mediates migration in SK-N-SH neuroblastoma cells Cell Adhesion & Migration 2019-01-01 [PMID: 30160193] (Immunohistochemistry, Human)
• S Sze Wah Wo, M Rani, E Dodagatta-, O Ibrahim-Gr, U Kishore, J Bayry, JP Latgé, A Sahu, T Madan, V Aimanianda Fungal melanin stimulates surfactant protein D-mediated opsonization of and host immune response to <em>Aspergillus fumigatus</em> spores J. Biol. Chem., 2018-02-05;0(0):. 2018-02-05 [PMID: 29414772] (Direct ELISA, Flow Cytometry, ICC, Human)

Bioinformatics

• Gene Symbol: SFTPD
• Uniprot:
  • P35247.2()