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Mucosa-associated lymphoid tissue lymphoma translocation protein 1 (MALT1), also known as MLT1 or paracaspase 1, is a member of the human paracaspase family and an interacting partner of B-cell lymphoma 10 (Bcl-10) (1). In vitro, In vitro, MALT1 synergizes with BCL10 to enhance nuclear factor B activation (2) and to mediate IB kinase (IKK) activation by facilitating the ubiquitinylation of the NF-B essential modulator (NEMO) (3). MALT1 is found in recurrent chromosomal translocations in non-Hodgkin B-cell lymphoma of the mucosa-associated lymphoid tissue (MALT). One common translocation juxtaposes the MALT1 gene to the IgH promoter region, resulting in up-regulation of Bcl-10 and MALT1 (4). Another common translocation creates a fusion between MALT1 and the inhibitor of apoptosis gene API2 (cIAP2/HIAP1) (5).
