properdin factor D

pro·per·din fac·tor D

a normal serum α-globulin (MW about 25,000) required in the properdin system to cleave factor B into Bb and Ba. Bb combines with C3b to form the C3 convertase of the alternative complement pathway.

pro·per·din fac·tor D

(prō'pĕr-din fak'tŏr)
A normal serum α-globulin required in the properdin system.