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Volumn 125, Issue 47, 2003, Pages 14580-14589

Degradation of Myoglobin by Polymeric Artificial Metalloproteases Containing Catalytic Modules with Various Catalytic Group Densities: Site Selectivity in Peptide Bond Cleavage

Author keywords

[No Author keywords available]

Indexed keywords

DINUCLEAR CATALYSTS;

EID: 0344443325     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja034730t     Document Type: Article
Times cited : (57)

References (65)
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    • (1996) Polvmeric Materials Encyclopedia , pp. 4210-4218
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    • (1996) Perspectives on Bioinorganic Chemistry , vol.3 , pp. 115-149
    • Suh, J.1
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  • 48
    • 0344752108 scopus 로고
    • Hames, B. D., Rickwood, D., Eds.; IRL Press: New York; Chapter 1
    • Hames, B. D. In Gel Electrophoresis of Proteins; Hames, B. D., Rickwood, D., Eds.; IRL Press: New York, 1990; Chapter 1.
    • (1990) Gel Electrophoresis of Proteins
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  • 49
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    • note
    • The quality of data points in Figures 4 and 5 is not high. This has been also observed in kinetic studies with other polymeric artificial proteases.25-27.33 The erratic data points may be ascribed to several sources: accurate measurement of densities of the parent electrophoretic band is sometimes difficult, the parent electrophoretic band may contain large degradation products in addition to the uncleaved protein substrate, properties of surface of the polymeric catalyst may be affected by pH changes which is not easily predicted, and so on. Despite scattered data points in Figures 4 and 5, the general shape of the pH profile and the optimum pH may be accurately identified and the value of a kinetic parameter measured at the optimum pH can be taken as the representative value of the catalyst.
  • 50
    • 0344752106 scopus 로고    scopus 로고
    • note
    • Gly is the C-terminal residue of the protein fragments with m/z of 6578 and 6868 whereas Ala is that of 10 382. The low reactivity of these protein fragments toward CPA is consistent with the substrate selectivity51 of CPA.
  • 53
    • 0344319840 scopus 로고    scopus 로고
    • note
    • Negligible hydrolysis of the peptide bonds of the catalytic modules either on the surface of PS or in the bulk water suggests that the intramolecular attack by the Cu(II)Cyc group at the peptide linkage involves steric strain.
  • 58
    • 0344752109 scopus 로고    scopus 로고
    • note
    • Histidyl imidazole is utilized as a ligand for Cu(II) ion in various Cu(II) enzymes such as ascorbate oxidase, plastocycanin, hemocyanin, and copper zinc superoxide dismutase.59
  • 60
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    • note
    • MS/Ac.51
  • 61
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    • note
    • -4 M) revealed, however, neither the oligopeptide nor its hydrolysis products containing the cinnamoyl chromophore were detected. This indicates ready adsorption of the oligopeptide substrate and/or its hydrolysis products onto the resins.
  • 62
    • 0344752107 scopus 로고    scopus 로고
    • note
    • For example, another derivative of polystyrene containing Cu(II)Cyc prepared in a previous study effectively cleaved22 γ-globulin. This catalyst, however, was not effective toward albumin. On the other hand. an artificial protease prepared by construction of an artificial active site comprising three salicylate residues on polystyrene effectively cleaved albumin32 but was not active toward γ-globulin. Similarly, an artificial protease prepared by attaching two or more proximal imidazoles on polystyrene manifested high proteolytic activity toward albumin31 but did not cleave γ-globulin.
  • 63
    • 0344319837 scopus 로고    scopus 로고
    • note
    • If the protein substrates or their hydrolysis products are bound too strongly and, thus, adsorbed onto the polymeric support, then the polymer has little catalytic value. For example, γ-globulin and albumin are strongly adsorbed onto the Amberlite weakly acidic cation exchanger in which polystyrene is the matrix and carboxyl group is the active group.64


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.