Production of recombinant human alpha(1)-microglobulin and mutant forms involved in chromophore formation
(2007) In Protein Expression and Purification 53(1). p.145-152- Abstract
- alpha-Microglobulin, a 26 kDa lipocalin present in plasma and tissues, carries a set of unknown chromophores, bound to C34, K92, KI 18 and KI 30, which cause its charge and size heterogeneity. In man, the protein is found in two forms, full length and lacking the C-terminal tetrapeptide LIPR (t-alpha(1)-microglobulin), both which are heme-binding and the latter with heme-degrading properties. We report cloning and overexpression of full length alpha(1)-microglobulin (wt protein), t-alpha(1)-microglobulin (wtz LIPR) and the mutants C34S, K(92,118,130)T and C34S/K(92,118,130)T, the latter subsequently abbreviated as K(3)T and C34S/K(3)T, in Escherichia coli. After purification and refolding from inclusion bodies, all proteins were correctly... (More)
- alpha-Microglobulin, a 26 kDa lipocalin present in plasma and tissues, carries a set of unknown chromophores, bound to C34, K92, KI 18 and KI 30, which cause its charge and size heterogeneity. In man, the protein is found in two forms, full length and lacking the C-terminal tetrapeptide LIPR (t-alpha(1)-microglobulin), both which are heme-binding and the latter with heme-degrading properties. We report cloning and overexpression of full length alpha(1)-microglobulin (wt protein), t-alpha(1)-microglobulin (wtz LIPR) and the mutants C34S, K(92,118,130)T and C34S/K(92,118,130)T, the latter subsequently abbreviated as K(3)T and C34S/K(3)T, in Escherichia coli. After purification and refolding from inclusion bodies, all proteins were correctly folded as determined by far-UV circular dichroism and radioimmunoassay. As revealed by gel filtration, recombinant alpha(1)-microglobulins had lower tendencies to form dimers than human plasma or urine analogues. All alpha(1)-microglobulin forms displayed higher amounts of the chromophore than bovine serum albumin but significantly lower than the human urine or plasma counterparts. Differences in the absorbance and fluorescence profiles are consistent with a model where the chromophore is formed by a series of reactions with heme or other chromophore precursors and where C34 is essential for binding of the ligand, K92, KI 18 and K130 are involved in transformation into the chromophore and LIPR inhibits the latter reaction. (c) 2006 Elsevier Inc. All rights reserved. (Less)
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https://lup.lub.lu.se/record/661080
- author
- Kwasek, Anna ; Osmark, Peter LU ; Allhorn, Maria LU ; Lindqvist, Annika ; Åkerström, Bo LU and Wasylewski, Zygmunt
- organization
- publishing date
- 2007
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- affinity chromatography, immobilised metal-ion, alpha 1-microglobulin, recombinant protein, circular dichroism, radioimmunoassay
- in
- Protein Expression and Purification
- volume
- 53
- issue
- 1
- pages
- 145 - 152
- publisher
- Academic Press
- external identifiers
-
- wos:000246245000018
- scopus:33847148408
- pmid:17169572
- ISSN
- 1046-5928
- DOI
- 10.1016/j.pep.2006.10.023
- language
- English
- LU publication?
- yes
- id
- 3c091488-3275-466f-baab-4a8c574fd64e (old id 661080)
- date added to LUP
- 2016-04-01 12:08:13
- date last changed
- 2022-02-18 18:22:32
@article{3c091488-3275-466f-baab-4a8c574fd64e,
abstract = {{alpha-Microglobulin, a 26 kDa lipocalin present in plasma and tissues, carries a set of unknown chromophores, bound to C34, K92, KI 18 and KI 30, which cause its charge and size heterogeneity. In man, the protein is found in two forms, full length and lacking the C-terminal tetrapeptide LIPR (t-alpha(1)-microglobulin), both which are heme-binding and the latter with heme-degrading properties. We report cloning and overexpression of full length alpha(1)-microglobulin (wt protein), t-alpha(1)-microglobulin (wtz LIPR) and the mutants C34S, K(92,118,130)T and C34S/K(92,118,130)T, the latter subsequently abbreviated as K(3)T and C34S/K(3)T, in Escherichia coli. After purification and refolding from inclusion bodies, all proteins were correctly folded as determined by far-UV circular dichroism and radioimmunoassay. As revealed by gel filtration, recombinant alpha(1)-microglobulins had lower tendencies to form dimers than human plasma or urine analogues. All alpha(1)-microglobulin forms displayed higher amounts of the chromophore than bovine serum albumin but significantly lower than the human urine or plasma counterparts. Differences in the absorbance and fluorescence profiles are consistent with a model where the chromophore is formed by a series of reactions with heme or other chromophore precursors and where C34 is essential for binding of the ligand, K92, KI 18 and K130 are involved in transformation into the chromophore and LIPR inhibits the latter reaction. (c) 2006 Elsevier Inc. All rights reserved.}},
author = {{Kwasek, Anna and Osmark, Peter and Allhorn, Maria and Lindqvist, Annika and Åkerström, Bo and Wasylewski, Zygmunt}},
issn = {{1046-5928}},
keywords = {{affinity chromatography; immobilised metal-ion; alpha 1-microglobulin; recombinant protein; circular dichroism; radioimmunoassay}},
language = {{eng}},
number = {{1}},
pages = {{145--152}},
publisher = {{Academic Press}},
series = {{Protein Expression and Purification}},
title = {{Production of recombinant human alpha(1)-microglobulin and mutant forms involved in chromophore formation}},
url = {{http://dx.doi.org/10.1016/j.pep.2006.10.023}},
doi = {{10.1016/j.pep.2006.10.023}},
volume = {{53}},
year = {{2007}},
}