LIM homeobox 1 gene product (Lim-1), also known as LHX-1, is a homeobox nuclear transcription factor expressed in human brain, thymus, tonsil and many myeloid leukemias. The 406 amino acid human LIM-1 contains a LIM domain with twin zinc-binding sequences and a homeobox DNA-binding domain. The C-terminal sequence used as an immunogen is virtually identical between human and mouse LIM-1. A truncated human isoform does not include this sequence. LIM-1 activity is controlled by interaction with the ubiquitous nuclear adaptor protein Ldb-1 (Lim-domain-binding protein-1) which binds the LIM domain and mediates dimerization.
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