Papain: Difference between revisions
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===Commercial and Biomedical=== | ===Commercial and Biomedical=== | ||
Papain digests most proteins, often more extensively than pancreatic proteases. It has a very broad specificity and is known to cleave peptide bonds of basic amino acids and leucine and glycine residues, but prefers amino acids with large hydrophobic side chains. This non-specific nature of papain's hydrolase activity has led to its use in many and varied commercial products. It is often used as a meat tenderizer because it can hydrolyze the peptide bonds of collagen, elastin, and actomyosin. It is also used in contact lens solution to remove protein deposits on the lenses and marketed as a digestive supplement. <ref> http://www.webmd.com/vitamins-supplements/ingredientmono-69-PAPAIN.aspx?activeIngredientId=69&activeIngredientName=PAPAIN </ref> Finally, papain has several common uses in general biomedical research, including a gentle cell isolation agent, production of glycopeptides from purified proteoglycans, and solubilization of integral membrane proteins. It is also notable for its ability to specifically cleave IgG and IgM antibodies above and below the disulfide bonds that join the heavy chains and that is found between the light chain and heavy chain. This generates two monovalent Fab segments, that each have a single antibody binding sites, and an intact Fc fragment.<ref name="Worthington" /> | Papain digests most proteins, often more extensively than pancreatic proteases. It has a very broad specificity and is known to cleave peptide bonds of basic amino acids and leucine and glycine residues, but prefers amino acids with large hydrophobic side chains. This non-specific nature of papain's hydrolase activity has led to its use in many and varied commercial products. It is often used as a meat tenderizer because it can hydrolyze the peptide bonds of collagen, elastin, and actomyosin. It is also used in contact lens solution to remove protein deposits on the lenses and marketed as a digestive supplement. <ref> http://www.webmd.com/vitamins-supplements/ingredientmono-69-PAPAIN.aspx?activeIngredientId=69&activeIngredientName=PAPAIN </ref> Finally, papain has several common uses in general biomedical research, including a gentle cell isolation agent, production of glycopeptides from purified proteoglycans, and solubilization of integral membrane proteins. It is also notable for its ability to specifically cleave IgG and IgM antibodies above and below the disulfide bonds that join the heavy chains and that is found between the light chain and heavy chain. This generates two monovalent Fab segments, that each have a single antibody binding sites, and an intact Fc fragment.<ref name="Worthington" /> | ||
==Fun Trivia== | |||
Remember the 2002 SARS (Severe Acute Respiratory Syndrome) epidemic that placed global health, particularly in Southeast Asia, in a precarious state? On-going research is happening to further understand the mechanisms of this coronavirus, so that future steps can be taken for prevention. Its been found that the replication of RNA for this virus is mediated by two viral proteases that have many papain-like characteristics. <ref>PMID: 16306590 </ref> | |||
Despite a low percentage of sequence identities, inhibition and sequence analyses have increasingly been drawing parallels between L proteinases, that involve the foot-and-mouth disease virus and equine rhinovirus 1, and papain. With a similar overall fold to papain and identifiable regions that resemble the five alpha-helices and seven beta-sheets of papain, L proteinases of foot-and-mouth disease virus and of equine rhinovirus 1 reveal a mode of operation that is very papain like. <ref>PMID: 9472614 </ref> | |||
==References== | |||
<references /> | |||
<ref group="xtra">PMID:8140097</ref> | |||
==Reference== | ==Reference== | ||
