| molecular function | 
|---|
|  | GO:0005509 |  | calcium ion binding |  | Interacting selectively and non-covalently with calcium ions (Ca2+). | 
|  | GO:0004175 |  | endopeptidase activity |  | Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain. | 
|  | GO:0016787 |  | hydrolase activity |  | Catalysis of the hydrolysis of various bonds, e.g. C-O, C-N, C-C, phosphoric anhydride bonds, etc. Hydrolase is the systematic name for any enzyme of EC class 3. | 
|  | GO:0046872 |  | metal ion binding |  | Interacting selectively and non-covalently with any metal ion. | 
|  | GO:0004222 |  | metalloendopeptidase activity |  | Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a mechanism in which water acts as a nucleophile, one or two metal ions hold the water molecule in place, and charged amino acid side chains are ligands for the metal ions. | 
|  | GO:0008237 |  | metallopeptidase activity |  | Catalysis of the hydrolysis of peptide bonds by a mechanism in which water acts as a nucleophile, one or two metal ions hold the water molecule in place, and charged amino acid side chains are ligands for the metal ions. | 
|  | GO:0008233 |  | peptidase activity |  | Catalysis of the hydrolysis of a peptide bond. A peptide bond is a covalent bond formed when the carbon atom from the carboxyl group of one amino acid shares electrons with the nitrogen atom from the amino group of a second amino acid. | 
|  | GO:0005515 |  | protein binding |  | Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules). | 
|  | GO:0004252 |  | serine-type endopeptidase activity |  | Catalysis of the hydrolysis of internal, alpha-peptide bonds in a polypeptide chain by a catalytic mechanism that involves a catalytic triad consisting of a serine nucleophile that is activated by a proton relay involving an acidic residue (e.g. aspartate or glutamate) and a basic residue (usually histidine). | 
|  | GO:0008270 |  | zinc ion binding |  | Interacting selectively and non-covalently with zinc (Zn) ions. | 
  | biological process | 
|---|
|  | GO:0071732 |  | cellular response to nitric oxide |  | Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a nitric oxide stimulus. | 
|  | GO:0030574 |  | collagen catabolic process |  | The proteolytic chemical reactions and pathways resulting in the breakdown of collagen in the extracellular matrix, usually carried out by proteases secreted by nearby cells. | 
|  | GO:0022617 |  | extracellular matrix disassembly |  | A process that results in the breakdown of the extracellular matrix. | 
|  | GO:0010727 |  | negative regulation of hydrogen peroxide metabolic process |  | Any process that decreases the frequency, rate or extent of the chemical reactions and pathways involving hydrogen peroxide. | 
|  | GO:1903209 |  | positive regulation of oxidative stress-induced cell death |  | Any process that activates or increases the frequency, rate or extent of oxidative stress-induced cell death. | 
|  | GO:0032461 |  | positive regulation of protein oligomerization |  | Any process that activates or increases the frequency, rate or extent of protein oligomerization. | 
|  | GO:0006508 |  | proteolysis |  | The hydrolysis of proteins into smaller polypeptides and/or amino acids by cleavage of their peptide bonds. | 
  | cellular component | 
|---|
|  | GO:0031012 |  | extracellular matrix |  | A structure lying external to one or more cells, which provides structural support for cells or tissues. | 
|  | GO:0005576 |  | extracellular region |  | The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite. | 
|  | GO:0005615 |  | extracellular space |  | That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid. | 
|  | GO:0005578 |  | proteinaceous extracellular matrix |  | A layer consisting mainly of proteins (especially collagen) and glycosaminoglycans (mostly as proteoglycans) that forms a sheet underlying or overlying cells such as endothelial and epithelial cells. The proteins are secreted by cells in the vicinity. An example of this component is found in Mus musculus. |