Human heart LIM protein has transcription activation ability related to LIM domain 1

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Human heart LIM (hhLIM), a muscle-specific expressed transcriptional coactivator of cardiac hypertrophy related gene, stimulates transcriptional activation of the ANF gene promoter in H9C2 cells. We revealed that the N-terminal half of hhLIM mediated this activation, in which the LIM domain 1 and protein kinase C phosphorylation site are important, especially the LIM domain 1. Further, mutagenesis of the conserved Cys in the LIM domain 1 abolished its ability to activate cardiac hypertrophy. These findings suggest that hhLIM is a typical LIM family member with powerful transcription activation.

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