KfrA plasmid protein monolayers on latex particles-electrokinetic measurements
Marta Kujda , Zbigniew Adamczyk , Grażyna Jagura-Burdzy , Małgorzata Adamczyk
AbstractMonolayers of KfrA, a protein assisting in bacteria plasmid segregation, on polystyrene latex particles were produced in controlled self-assembling under diffusion-controlled conditions. The coverage of the protein was quantitatively determined as a function of ionic strength (up to 0.15 M, NaCl) via micro-electrophoretic measurements and concentration depletion with the aid of AFM imaging. The maximum monolayer coverage of KfrA monotonically increased with ionic strength attaining 2.0 mg m−2 for 0.15 M, NaCl that corresponds to the dimensionless coverage of 0.48. This is in accordance with theoretical calculations derived from the random sequential adsorption modeling assuming a tetrameric aggregation state. A high stability of the monolayers in pH cycling experiments was confirmed, which proves the irreversibility of protein adsorption on latex. The acid base properties and the electrokinetic charge of monolayers were also determined via the electrophoretic mobility measurements carried out for various ionic strength. In this way the isoelectric point of the protein of 4.8 was determined, which is prohibitive via bulk measurements. It was concluded that the procedure used in our work is reliable and efficient for characterizing physicochemical properties if minor amounts of a protein are available.
|Journal series||Colloids and Surfaces B-Biointerfaces, ISSN 0927-7765|
|Publication size in sheets||0.5|
|Keywords in English||Monolayers of KfrA protein on latex; Plasmid protein adsorption on latex; KfrA plasmid protein properties; Isoelectric point of KfrA; KfrA plasmid protein adsorption; Latex covered by KfrA plasmid protein|
|ASJC Classification||; ; ; ;|
|Score|| = 30.0, 02-02-2020, ArticleFromJournal|
= 35.0, 02-02-2020, ArticleFromJournal
|Publication indicators||= 6; = 7; : 2013 = 1.573; : 2013 = 4.287 (2) - 2013=4.226 (5)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.