Journal article

A naturally occurring NAR variable domain binds the Kgp protease from Porphyromonas gingivalis

SD Nuttall, UV Krishnan, L Doughty, A Nathanielsz, N Ally, RN Pike, PJ Hudson, AA Kortt, RA Irving

FEBS LETTERS | ELSEVIER SCIENCE BV | Published : 2002

Abstract

The new antigen receptor (NAR) from sharks consists of a single immunoglobulin variable domain attached to five constant domains, and is hypothesised to function as an antibody. Two closely related NARs with affinity for the Kgp (lysine-specific) gingipain protease from Porphyromonas gingivalis were selected by panning an NAR variable domain library. When produced in Escherichia coli, these recombinant NARs were stable, correctly folded, and specifically bound Kgp (K(d)=1.31+/-0.26x10(-7) M). Binding localised to the Kgp adhesin domains, however without inhibiting adhesin activity. These naturally occurring proteins indicate an immune response to pathogenic bacteria and suggest that the NAR ..

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