Structural separation of different extracellular activities in aminoacyl-tRNA synthetase-interacting multi-functional protein, p43/AIMP1 - PubMed (original) (raw)
. 2006 Mar 31;342(1):113-8.
doi: 10.1016/j.bbrc.2006.01.117. Epub 2006 Feb 2.
Affiliations
- PMID: 16472771
- DOI: 10.1016/j.bbrc.2006.01.117
Structural separation of different extracellular activities in aminoacyl-tRNA synthetase-interacting multi-functional protein, p43/AIMP1
Jung Min Han et al. Biochem Biophys Res Commun. 2006.
Abstract
AIMP1 (previously known as p43) is first found as a factor associated with a macromolecular tRNA synthetase complex. However, it is also secreted and acts on diverse target cells such as endothelial cells, macrophages, and fibroblasts to control angiogenesis, inflammation, and dermal regeneration, respectively. We previously showed that AIMP1 induces the death of endothelial cell but proliferation of fibroblasts and activates macrophages. In this work, we found that elastase 2-cleaved AIMP1 retained its pro-apoptotic activity to endothelial cells but lost the growth-stimulatory activity to fibroblasts. To determine the functional domains responsible for each activity, we generated several deletion fragments of AIMP1 and compared the activities to the target cells. AIMP1 promoted endothelial cell death and caspase-3 activation through its 101-114 amino acid region, fibroblast proliferation through its 6-46 amino acid region, and endothelial migration through its 114-192 amino acid region as revealed by deletion mapping. Thus, this work revealed that AIMP1 uses different regions for its diverse extracellular activities.
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