Abstract:
:Two forms of urokinase [EC 3.4.99.26] with molecular weights of 51,600 and 34,500 were purified from human urine. The specific activities of the high molecular weight urokinase (HMW-UK) and low molecular weight urokinase (LMW-UK) were 157,400 and 246,700 International Units (IU/mg), respectively. Purified HMW-UK was 97% active and LMW-UK was 88% active, as judged by using p-nitrophenyl-p'-guanidinobenzoate. LMW-UK had five multiple isoelectric subforms, compared with HMW-UK which had only one. Not only HMW-UK but also LMW-UK was composed of two polypeptide chains linked by disulfide bond(s). The molecular weight of the heavy chain of both forms was the same (34,000 daltons), while the molecular weight of the light chain of HMW-UK was 17,600 and that of LMW-UK was approximately 1,200-3,400. Enzyme kinetic studies revealed that the kinetic constants, Km and Kcat, of both forms toward the synthetic substrates, acetyl-Gly-Lys-methylester (AGLMe) and glutaryl-Gly-Arg-4-methylcoumarin-7-amide (GGA-MCA), were almost the same, but the dissociation constant of HMW-UK toward Glu-plasminogen was 2.4-2.6 times less than that of LMW-UK. HMW-UK incubated at 37 degrees C was converted into LMW-UK in an autocatalytic digestion manner leading to no loss of the total activity. These results show that HMW-UK with a higher affinity toward Glu-plasminogen is converted into LMW-UK with a lower affinity, a greater portion of the light chain of HMW-UK splitting off.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Nobuhara M,Sakamaki M,Ohnishi H,Suzuki Ydoi
10.1093/oxfordjournals.jbchem.a133453subject
Has Abstractpub_date
1981-07-01 00:00:00pages
225-32issue
1eissn
0021-924Xissn
1756-2651journal_volume
90pub_type
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pub_type: 杂志文章
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journal_title:Journal of biochemistry
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更新日期:1990-12-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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pub_type: 杂志文章
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更新日期:1986-02-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a133200
更新日期:1981-01-01 00:00:00