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Cummings CS, Campbell AS, Baker SL, Carmali S, Murata H, Russell AJ. Design of Stomach Acid-Stable and Mucin-Binding Enzyme Polymer Conjugates. Biomacromolecules 2017; 18:576-586. [DOI: 10.1021/acs.biomac.6b01723] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Chad S. Cummings
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Alan S. Campbell
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Stefanie L. Baker
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Sheiliza Carmali
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Hironobu Murata
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Alan J. Russell
- Center for Polymer-Based Protein Engineering, ‡Department of Biomedical Engineering, §Disruptive Health Technology
Institute, and ∥Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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Al-Ajlan A, Bailey GS. Purification and characterization of cationic chymotrypsin from the pancreas of the Arabian camel (Camelus dromedarius). Mol Cell Biochem 2000; 203:73-8. [PMID: 10724334 DOI: 10.1023/a:1007097231327] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This study reports on the purification and characterization of a cationic enzyme with chymotryptic activity from camel pancreas. The enzyme was purified 52-fold in a 48% yield by a three-step chromatographic procedure consisting of anion-exchange, cation-exchange and affinity chromatographies. The purified enzyme was homogeneous on gel isoelectric focusing and on SDS gel electrophoresis. Its isoelectric point was estimated to be 7.3 and its molecular mass was found to be 23,600 Da. The enzyme was identified as a cationic chymotrypsin according to its physiochemical properties, substrate specificity and susceptibility to inhibition. It was active towards esters of aromatic amino acids but much less active towards a leucine ester. In all cases, the k(cat) values of the camel enzyme were less than the corresponding values of bovine chymotrypsin A. It also showed a lower level of kininase activity. Camel chymotrypsin was more susceptible than its bovine equivalent to inhibition by soybean trypsin inhibitor and aprotinin. It showed the same pH optimum as bovine chymotrypsin A for its esterolytic activity, but was more dependent on CaCl2 for long-term stability.
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Affiliation(s)
- A Al-Ajlan
- Department of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, UK
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Abstract
A carboxypeptidase B-like enzyme was purified 116-fold with a recovery of activity of 29% from a crude extract of camel pancreas by a four-step procedure consisting of two anion exchange chromatographies in succession, gel filtration and hydrophobic interaction chromatography. The enzyme was homogeneous on SDS and non-denaturing gel electrophoresis and on gel isoelectric focusing. Its molecular mass was found to be 31.5 kDa and its isoelectric point was estimated as 6.1. It was active towards a number of substrates that are cleaved by carboxypeptidases B from other species and was also susceptible to inhibition by inhibitors of such enzymes. The camel enzyme showed a pH optimum of 8.0 and it was seen to be a relatively potent kininase in vitro. The enzyme purified in this study was very similar to carboxypeptidases B isolated from other species in size, charge, substrate specificity and susceptibility to inhibition and thus it can be identified as camel carboxypeptidase B.
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Affiliation(s)
- A Al-Ajlan
- Department of Biological Sciences, Central Campus, University of Essex, Colchester, UK
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