"A procedure for human pregnancy zone protein (and human á2-macroglobulin) purification using hydrophobic interaction chromatography on Phenyl-Sepharose CL-4B".

CHIABRANDO G; BONACCI G; SANCHEZ MC; RAMOS A; ZALAZAR F; VIDES MA

PROTEIN EXPRESSION AND PURIFICATION

ACADEMIC PRESS INC ELSEVIER SCIENCE

Año: 1997 vol. 9 p. 399 - 399

1046-5928

n the present work we describe a procedure for the purification of human pregnancy zone protein (PZP) from pooled late pregnancy plasma by using hydrophobic interaction chromatography (HIC) on a phenyl-Sepharose column. The HIC step allowed the complete isolation of haptoglobins and the partial separation of human alpha 2-macroglobulin (alpha 2-M) from a protein fraction containing PZP previously obtained by a DEAE-Sephacel chromatography. Pure and native PZP, with a recovery of nearly 25% and biological activity of protease-binding, was obtained by two definitive final steps consisting of zinc-chelate and size-filtration chromatographies. Moreover, we further present an alternative procedure for the purification of alpha 2-M from the same pregnancy plasma, based on the differential elution of PZP and alpha 2-M from the HIC. This purification step gave rise to a highly purified product with a recovery of 10%. This differential elution could be explained by differences in surface hydro