Enzymatic activity of sperm proprotein convertase is important for mammalian fertilization.

Abstract:

:Proprotein convertase subtilisin/kexin 4 (PCSK4) is implicated for sperm fertilizing ability, based on studies using Pcsk4-null mice. Herein we demonstrated proprotein convertase (PC) activity in intact sperm and acrosomal vesicles. To determine whether this activity was important for sperm fertilizing ability, a peptide inhibitor was designed based on PCSK4 prodomain sequence (proPC4(75-90)), which contains its primary autocatalytic cleavage site. ProPC4(75-90) inhibited recombinant PCSK4's activity with a K(i) value of 5.4 µM, and at 500 µM, it inhibited sperm PC activity almost completely. Treatment of sperm with proPC4(75-90) inhibited their egg fertilizing ability in a dose dependent manner. Correlation between sperm PC activity and fertilizing ability showed a high co-efficient value (>0.9), indicating the importance of sperm PC activity in fertilization. In particular, sperm PC activity was important for capacitation and zona pellucida (ZP)-induced acrosome reaction, since proPC4(75-90) -treated sperm showed markedly decreased rates in these two events. These results were opposite to those observed in Pcsk4-null sperm, which contained higher PC activity than wild type sperm, possibly due to overcompensation by PCSK7, the other PCSK enzyme found in sperm. ADAM2 (45 kDa), a sperm plasma membrane protein, involved in sperm-egg plasma membrane interaction, was also processed into a smaller form (27 kDa) during capacitation at a much reduced level in proPC4(75-90) -treated sperm. This result suggested that ADAM2 may be a natural substrate of sperm PCSK4 and its cleavage by the enzyme during acrosome reaction may be relevant to the fertilization process.

journal_name

J Cell Physiol

authors

Iamsaard S,Vanichviriyakit R,Hommalai G,Saewu A,Srakaew N,Withyachumnarnkul B,Basak A,Tanphaichitr N

doi

10.1002/jcp.22626

subject

Has Abstract

pub_date

2011-11-01 00:00:00

pages

2817-26

issue

11

eissn

0021-9541

issn

1097-4652

journal_volume

226

pub_type

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