Lipopolysaccharide Binding Protein Active Protein | LBP active protein

Lipopolysaccharide Binding Protein, Recombinant, Mouse (LBP, LPSBP)

Cat. Num. AAA636952

• Gene Names: LBP; BPIFD2
• Purity: Highly Purified; ~95% (SDS-PAGE)
• Synonyms: Lipopolysaccharide Binding Protein; Recombinant; Mouse (LBP; LPSBP); LBP active protein

• Purity/Purification: Highly Purified; ~95% (SDS-PAGE)
• Form/Format: Supplied as a lyophilized powder in PBS, BSA. Reconstitute with PBS to 100ug/ml, 0.1% human or bovine serum albumin.

• Biological Activity: Measured by its ability to enhance LPS-stimulated IL-8 secretion by THP-1 human acute monocytic leukemia cells. The ED50 for this effect is typically 0.5-3ng/ml.
• Endotoxin Level: 1EU/1ug (LAL)
• Preparation and Storage: Lyophilized powder may be stored at -20 degree C. Stable for 12 months at -20 degree C. Reconstitute with PBS. Aliquot to avoid repeated freezing and thawing. Store at -20 degree C. Reconstituted product is stable for 6 months at -20 degree C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

Related Product Information for LBP active protein

LBP (Lipopolysaccharide binding protein) is a 58-62kD, single-chain glycoprotein member of the BPI/LBP family, BPI/PLUNC/PSP superfamily of lipid-binding proteins (1-3). It is secreted by a number of mammalian cell types, including hepatocytes (4), gingival keratinocytes (5), intestinal Paneth cells (6), and type II Greater alveolar cells (7). LBP is considered to be a class 1 APR (acute phase reactant) that is induced upon exposure to both IL-1 and IL-6 (8). These two cytokines appear upon immune cell exposure to pathogenic microbes. Following its synthesis and release, LBP is known to interact with bacterial wall components, lipopolysaccharide/LPS/Lipid A from Gram- (Gm-) bacteria, and lipoteichoic acid/LTA from Gm+ bacteria (9-13). In the case of LPS, this interaction appears to occur both in the bacterial cell wall, and within the intercellular space, where LPS micelles naturally form following bacterial death and cell wall dissolution (14-17). LBP is posited to induce disassembly of LPS micelles, allowing for LPS binding to LBP, and a heparin-mediated transfer of LPS from LBP to membrane-bound CD14 on the surface of monocytes/macrophages (15, 18). This CD14:LPS complex activates a TLR4:MD2 membrane complex, resulting in the production of NO and TNF-a (19). TNF-a serves as a chemoattractant for PMNs, and an initiator of coagulation that helps to wall-off and localize microbial elements (16). Notably, increased concentrations of LBP are also associated with parasitic infections (Trypanosoma), and may contribute to the immune response towards parasites (20). In addition to the above, LBP is also reported to transfer LPS to lipoproteins, particularly HDL and LDL (19, 21-23). For LDL, this transfer appears to be inhibitory to monocyte activation; for HDL, the effect may be either stimulatory or inhibitory, depending upon the circumstances (19). Mouse LBP is synthesized as a 481aa precursor that contains a 25 aa signal sequence and a 456 aa mature region (aa 26-481) (24). It contains an N-terminal LPS binding region plus a likely C-terminal LPS transfer region (24-25). Mature mouse LBP shares 68% and 88% aa identity with human and rat LBP, respectively (11, 25).

Product Categories/Family for LBP active protein

Molecular Biology; MB-Peptides

NCBI and Uniprot Product Information

• NCBI GI #: 186966
• NCBI GeneID: 3929
• UniProt Accession #: P18428; O43438; Q92672; Q9H403; Q9UD66; B2R938
• Molecular Weight: ~51.5kD
• NCBI Official Full Name: lipopolysaccharide binding protein (LBP), partial
• NCBI Official Synonym Full Names: lipopolysaccharide binding protein
• NCBI Official Symbol: LBP
• NCBI Official Synonym Symbols: BPIFD2
• NCBI Protein Information: lipopolysaccharide-binding protein; LPS-binding protein; BPI fold containing family D, member 2
• UniProt Protein Name: Lipopolysaccharide-binding protein
• Protein Family: Lipopolysaccharide-binding protein
• UniProt Gene Name: LBP
• UniProt Synonym Gene Names: LBP
• UniProt Entry Name: LBP_HUMAN

NCBI Description

The protein encoded by this gene is involved in the acute-phase immunologic response to gram-negative bacterial infections. Gram-negative bacteria contain a glycolipid, lipopolysaccharide (LPS), on their outer cell wall. Together with bactericidal permeability-increasing protein (BPI), the encoded protein binds LPS and interacts with the CD14 receptor, probably playing a role in regulating LPS-dependent monocyte responses. Studies in mice suggest that the encoded protein is necessary for the rapid acute-phase response to LPS but not for the clearance of LPS from circulation. This protein is part of a family of structurally and functionally related proteins, including BPI, plasma cholesteryl ester transfer protein (CETP), and phospholipid transfer protein (PLTP). [provided by RefSeq, Apr 2012]

Uniprot Description

LBP: Binds to the lipid A moiety of bacterial lipopolysaccharides (LPS), a glycolipid present in the outer membrane of all Gram-negative bacteria. The LBP/LPS complex seems to interact with the CD14 receptor. Belongs to the BPI/LBP/Plunc superfamily. BPI/LBP family.

Protein type: Secreted, signal peptide; Secreted

Chromosomal Location of Human Ortholog: 20q11.23

Cellular Component: extracellular space; cell surface; extracellular region

Molecular Function: protein binding; lipopolysaccharide binding; receptor binding

Biological Process: positive regulation of tumor necrosis factor biosynthetic process; detection of molecule of bacterial origin; positive regulation of toll-like receptor 4 signaling pathway; positive regulation of interleukin-6 production; response to lipopolysaccharide; negative regulation of tumor necrosis factor production; defense response to Gram-negative bacterium; positive regulation of tumor necrosis factor production; leukocyte chemotaxis during inflammatory response; positive regulation of chemokine production; positive regulation of interleukin-8 production; lipopolysaccharide transport; defense response to Gram-positive bacterium; macrophage activation during immune response; toll-like receptor signaling pathway; lipopolysaccharide-mediated signaling pathway; acute-phase response; innate immune response; cellular defense response; opsonization; toll-like receptor 4 signaling pathway; positive regulation of macrophage activation