Calgranulin

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Calgranulin C hexamer, Human. 1gqm.jpg
Calgranulin C hexamer, Human.

Calgranulin is an S100 calcium-binding protein that is expressed in multiple cell types, including renal epithelial cells and neutrophils.

S100 protein

The S100 proteins are a family of low-molecular-weight proteins found in vertebrates and characterized by two calcium-binding sites that have helix-loop-helix conformation. There are at least 21 different S100 proteins. They are encoded by a family of genes whose symbols use the S100 prefix, for example, S100A1, S100A2, S100A3. They are also considered as Damage-associated molecular pattern molecules (DAMPs) and knockdown of AHR downregulates the expression of S100 proteins in THP-1 cells.

Contents

The proteins S100A8 and S100A9 form a heterodimer called calprotectin .

S100A8 protein-coding gene in the species Homo sapiens

S100 calcium-binding protein A8 (S100A8) is a protein that in humans is encoded by the S100A8 gene. It is also known as calgranulin A.

S100A9 protein-coding gene in the species Homo sapiens

S100 calcium-binding protein A9 (S100A9) also known as migration inhibitory factor-related protein 14 (MRP14) or calgranulin B is a protein that in humans is encoded by the S100A9 gene.

Calprotectin is a complex of the mammalian proteins S100A8 and S100A9. In the presence of calcium, calprotectin is capable of sequestering the transition metals iron, manganese and zinc via chelation. This metal sequestration affords the complex antimicrobial properties. Calprotectin is the only known antimicrobial manganese sequestration protein complex. Calprotectin comprises as much as 60% of the soluble protein content of the cytosol of a neutrophil, and it is secreted by an unknown mechanism during inflammation. Faecal calprotectin has been used to detect intestinal inflammation and can serve as a biomarker for inflammatory bowel diseases. Other names for calprotectin include MRP8-MRP14, calgranulin A and B, cystic fibrosis antigen, L1, 60BB antigen, and 27E10 antigen.

Human genes

S100A12 protein-coding gene in the species Homo sapiens

S100 calcium-binding protein A12 (S100A12) is a protein that in humans is encoded by the S100A12 gene. It is also known as calgranulin C and belong to the S100 protein family

Function

Some in vitro evidence suggests that calgranulin can inhibit the precipitation of calcium oxalate in a urine-like environment at calgranulin concentrations below physiological concentrations. [1] Thus, it may also function in vivo as an inhibitor of calcium oxalate kidney stone formation. However, the role of calgranulin in the stone formation process has not been evaluated.

Calcium oxalate chemical compound

Calcium oxalate (in archaic terminology, oxalate of lime) is a calcium salt of oxalate with the chemical formula CaC2O4(H2O)x, where x varies from 1 to 3. All forms are colorless or white. The monohydrate occurs naturally as the mineral whewellite, forming envelope-shaped crystals, known in plants as raphides. The rarer dihydrate (mineral: weddellite) and trihydrate (mineral: caoxite) are also recognized. Calcium oxalates are a major constituent of human kidney stones. Calcium oxalate is also found in beerstone, a scale that forms on containers used in breweries.

Urine Liquid by-product of metabolism in the bodies of many animals, including humans

Urine is a liquid by-product of metabolism in humans and in many animals. Urine flows from the kidneys through the ureters to the urinary bladder. Urination results in urine being excreted from the body through the urethra.

See also

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References

  1. Pillay S, Asplin J, Coe F (1 August 1998). "Evidence that calgranulin is produced by kidney cells and is an inhibitor of calcium oxalate crystallization". Am J Physiol. 275 (2 Pt 2): F255–61. PMID   9691016.

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