The THUMP domain is named after after thiouridine synthases, methylases and PSUSs [1]. The THUMP domain consists of about 110 amino acid residues. The structure of ThiI reveals that the THUMP has a fold unlike that of previously characterised RNA-binding domains [2]. It is predicted that this domain is an RNA-binding domain The THUMP domain probably functions by delivering a variety of RNA modification enzymes to their targets [1].

1: THUMP - a predicted RNA-binding domain shared by 4-thiouridine, pseudouridine synthases and RNA methylases. Aravind L, Koonin EV; Trends Biochem Sci 2001;26:215-217. PMID:11295541

2: Crystal structure of Bacillus anthracis ThiI, a tRNA-modifying enzyme containing the predicted RNA-binding THUMP domain. Waterman DG, Ortiz-Lombardia M, Fogg MJ, Koonin EV, Antson AA; J Mol Biol. 2006;356:97-110. PMID:16343540