High mobility group protein HMG-I/HMG-Y (HMGA1)

HMG-I/Y bind preferentially into the minor groove of A+T rich regions in double-stranded DNA. It is suggested that these proteins could function in nucleosome phasing and at the 3'-end processing of mRNA transcripts.

They're also involved in the transcription regulation of genes comprising, or in close proximity to A+T-rich areas. .