PubMed:10187841 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/10187841","sourcedb":"PubMed","sourceid":"10187841","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/10187841","text":"Reactive site-modified tissue inhibitor of metalloproteinases-2 inhibits the cell-mediated activation of progelatinase A.\nTissue inhibitor of metalloproteinases-2 (TIMP-2) is supposed to play a regulatory role in the cell-mediated activation of progelatinase A. To investigate the mechanism of the regulation, we prepared and characterized a chemically modified TIMP-2, and examined its effects on the activation of progelatinase A. We found that treatment of TIMP-2 with cyanate ion led to loss of inhibitory activity toward matrilysin or gelatinase A. Structural and functional analyses of the modified TIMP-2 showed that carbamylation of the alpha-amino group of the NH2-terminal Cys1 of TIMP-2 led to complete loss of the inhibitory activity. When the reactive-site modified TIMP-2 was added to culture medium of concanavalin A-stimulated HT1080 cells, the conversion of endogenous progelatinase A to the intermediate form was partially inhibited, whereas that of the intermediate form to the mature one was strongly inhibited. The reactive site-modified TIMP-2 also prevented an accumulation of active gelatinase A on the cell surface. We speculate that occupation of the hemopexin-like domain of gelatinase A by the reactive site-modified TIMP-2 makes it unable for gelatinase A to be retained on the cell surface, thus preventing the autocatalytic conversion of the intermediate form of gelatinase A to its mature form.","tracks":[{"project":"sentences","denotations":[{"id":"T1","span":{"begin":0,"end":121},"obj":"Sentence"},{"id":"T2","span":{"begin":122,"end":261},"obj":"Sentence"},{"id":"T3","span":{"begin":262,"end":432},"obj":"Sentence"},{"id":"T4","span":{"begin":433,"end":553},"obj":"Sentence"},{"id":"T5","span":{"begin":554,"end":746},"obj":"Sentence"},{"id":"T6","span":{"begin":747,"end":1031},"obj":"Sentence"},{"id":"T7","span":{"begin":1032,"end":1140},"obj":"Sentence"},{"id":"T8","span":{"begin":1141,"end":1426},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"attributes":[{"subj":"T1","pred":"source","obj":"sentences"},{"subj":"T2","pred":"source","obj":"sentences"},{"subj":"T3","pred":"source","obj":"sentences"},{"subj":"T4","pred":"source","obj":"sentences"},{"subj":"T5","pred":"source","obj":"sentences"},{"subj":"T6","pred":"source","obj":"sentences"},{"subj":"T7","pred":"source","obj":"sentences"},{"subj":"T8","pred":"source","obj":"sentences"}]},{"project":"2015-BEL-Sample","denotations":[{"id":"T1","span":{"begin":1032,"end":1139},"obj":"cat(p(HGNC:TIMP2)) decreases cat(p(HGNC:MMP2))"}],"attributes":[{"subj":"T1","pred":"source","obj":"2015-BEL-Sample"}]},{"project":"2015-BEL-Sample-2","denotations":[{"id":"BEL:20000058","span":{"begin":1032,"end":1139},"obj":"cat(p(HGNC:TIMP2)) decreases cat(p(HGNC:MMP2))"},{"id":"BEL:20030278","span":{"begin":1032,"end":1139},"obj":"cat(p(HGNC:TIMP2)) decreases cat(p(HGNC:MMP2))"}],"attributes":[{"subj":"BEL:20000058","pred":"source","obj":"2015-BEL-Sample-2"},{"subj":"BEL:20030278","pred":"source","obj":"2015-BEL-Sample-2"}]},{"project":"Anatomy-UBERON","denotations":[{"id":"T1","span":{"begin":23,"end":29},"obj":"Body_part"},{"id":"T2","span":{"begin":122,"end":128},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0000479"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/UBERON_0000479"},{"subj":"T1","pred":"source","obj":"Anatomy-UBERON"},{"subj":"T2","pred":"source","obj":"Anatomy-UBERON"}]}],"config":{"attribute types":[{"pred":"source","value type":"selection","values":[{"id":"sentences","color":"#bb93ec","default":true},{"id":"2015-BEL-Sample","color":"#93eca1"},{"id":"2015-BEL-Sample-2","color":"#ec939f"},{"id":"Anatomy-UBERON","color":"#93b9ec"}]}]}}