The HTH lysR-type (IPR050950) is a transcription regulator for the HTH-type LysR. It regulates gene expression and DNA binding. This family of proteins controls many cellular processes, such as the breakdown of compounds like protocatechuate and sodium dodecyl sulfate (SDS). They are also involved in malolactic fermentation, the regulation of operons related to nitrogen metabolism, and responses to sulfur sources. They can often respond to environmental cues or the presence of specific inducers by acting as activators or repressors of transcription.