Gelatinases are enzymes capable of degrading gelatin through hydrolysis, playing a major role in degradation of extracellular matrix and tissue remodeling. Gelatinases are a type of matrix metalloproteinase (MMP), a family of enzymes that depend on zinc as a cofactor and can break down parts of the extracellular matrix. MMPs have multiple subgroups, including gelatinase A () and gelatinase B (). Gelatinases are assigned a variety of Enzyme Commission numbers: gelatinase A uses 3.4.24.24, and gelatinase B uses 3.4.24.35, in which the first three numbers are same. The first digit, 3, is the
Gelatinases are enzymes capable of degrading gelatin through hydrolysis, playing a major role in degradation of extracellular matrix and tissue remodeling. Gelatinases are a type of matrix metalloproteinase (MMP), a family of enzymes that depend on zinc as a cofactor and can break down parts of the extracellular matrix. MMPs have multiple subgroups, including gelatinase A () and gelatinase B (). Gelatinases are assigned a variety of Enzyme Commission numbers: gelatinase A uses 3.4.24.24, and gelatinase B uses 3.4.24.35, in which the first three numbers are same. The first digit, 3, is the class. Class 3 enzymes are hydrolases, enzymes that catalyze hydrolysis reactions, that is, they cleave bonds in presence of water. The next digit represents sub-class 4, or proteases, which are enzymes who hydrolyze peptide bonds in proteins. The next number is the sub-subclass of 24, which consists of metalloendopeptidases which contain metal ions in their active sites, in this case zinc, which help in cleaving peptide bonds. The last part of the EC number is the serial number, identifying specific enzymes within a sub-subclass. 24 represents gelatinase A, which is a metalloproteinase that breaks down gelatin and collagen, while 35 represents gelatinase B, which hydrolyzes peptide bonds.
== Gelatinase application in species == Gelatinase enzymes can be found in a number of eukaryotes, including mammals, and birds; bacteria including Pseudomonas aeruginosa and Serratia marcescens), and fungi, but may have variations among species based on identification and function of the gelatinase type. In humans, the gelatinases expressed are matrix metalloproteinases MMP2 and MMP9. Additionally, gelatinases A (MMP2) and B (MMP9) have been proven to assist in developing new blood vessels in corneas of rats and rabbits when experiencing corneal damage. Corneal wounds in these rodents can yield greater expression and activity of the enzyme. Gelatinase assists in remodeling damaged extracellular matrix (ECM) by removing the damaged matrix proteins (by MMP-9), yielding an angiogenic response, or formation of new blood vessels. This indicates that there is collagen remodeling in the corneal stromal repair tissue with Gelatinases.
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