The Secreted Dictyostelium Protein CfaD is a Chalone

Overview

Journal J Cell Sci

Specialty Cell Biology

Date 2008 Jul 10

PMID 18611962

Citations 37

Authors

Deenadayalan Bakthavatsalam

Debra A Brock

N Neda Nikravan

Kevin D Houston

R Diane Hatton

Richard H Gomer

Affiliations

Soon will be listed here.

Abstract

Dictyostelium discoideum cells secrete CfaD, a protein that is similar to cathepsin proteases. Cells that lack cfaD proliferate faster and reach a higher stationary-phase density than wild-type cells, whereas cells that overexpress CfaD proliferate slowly and reach the stationary phase when at a low density. On a per-nucleus basis, CfaD affects proliferation but not growth. The drawback of not having CfaD is a reduced spore viability. Recombinant CfaD has no detectable protease activity but, when added to cells, inhibits the proliferation of wild-type and cfaD(-) cells. The secreted protein AprA also inhibits proliferation. AprA is necessary for the effect of CfaD on proliferation. Molecular-sieve chromatography indicates that in conditioned growth medium, the 60 kDa CfaD is part of a approximately 150 kDa complex, and both chromatography and pull-down assays suggest that CfaD interacts with AprA. These results suggest that two interacting proteins may function together as a chalone signal in a negative feedback loop that slows Dictyostelium cell proliferation.

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