Ohkubo I, Namikawa C, Higashiyama S, Sasaki M, Minowa O, Mizuno Y, Shiokawa H. Purification and characterization of alpha 1-thiol proteinase inhibitor and its identity with kinin- and fragment 1.2-free high molecular weight kininogen.
THE INTERNATIONAL JOURNAL OF BIOCHEMISTRY 1988;
20:243-58. [PMID:
3356290 DOI:
10.1016/0020-711x(88)90348-5]
[Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
1. alpha 1-Thiol proteinase inhibitor (alpha 1 TPI) purified from outdated human plasma was a glycoprotein with Mr 83,000 and was composed of heavy and light chains held together with a disulfide bond. 2. The data on amino acid composition, amino terminal sequence of the light chain and carboxyl terminal sequences of the heavy and light chains indicate that alpha 1 TPI is identical with kinin- and fragment 1.2-free HMW kininogen. 3. Purified human plasmin generated a derivative having the same molecular weight (Mr 83,000), same subunit structure (heavy and light chains) and same inhibitory capacity as alpha 1 TPI from HMW kininogen and kinin-free HMW kininogen. This indicated the possibility that alpha 1 TPI is derived from HMW kininogen by plasmin.
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