This entry represents the ferredoxin-like domain found at the N-terminal of ThiI proteins (NFLD) [1-3]. ThiI is responsible for the formation of the modified base S(4)U (4-thiouridine) found at position 8 in some prokaryotic tRNA. This domain connect ...
This entry represents the ferredoxin-like domain found at the N-terminal of ThiI proteins (NFLD) [1-3]. ThiI is responsible for the formation of the modified base S(4)U (4-thiouridine) found at position 8 in some prokaryotic tRNA. This domain connects the C-terminal catalytic PP-loop pyrophosphatase domain with the THUMP (Pfam:PF02926). NFLD and the THUMP domains jointly form the tRNA-binding surface shaped like a channe which may be of particular importance in ThiI for the correct orientation and distance between residues involved in RNA binding and the active site of the enzyme [2,4].
The THUMP domain is named after after thiouridine synthases, methylases and PSUSs [1]. The THUMP domain consists of about 110 amino acid residues. This domain is found in many tRNA modification enzymes classified into five types, namely 4-thiouridine ...
The THUMP domain is named after after thiouridine synthases, methylases and PSUSs [1]. The THUMP domain consists of about 110 amino acid residues. This domain is found in many tRNA modification enzymes classified into five types, namely 4-thiouridine synthetase, deaminase, methyltransferase, a partner protein of acetyltransferase and pseudouridine synthase [3]. The structure of ThiI reveals that the THUMP has a fold unlike that of previously characterised RNA-binding domains [2-3] and was first predicted to function by delivering a variety of RNA modification enzymes to their targets [1]. Studies performed in tRNA 4-thiouridine synthetase, tRNA methyltransferases and tRNA deaminase suggest that the THUMP domain captures the 3'-end of RNA but in some cases this is not applicable due to the modification patterns observed in tRNA [3]. Several THUMP-related proteins are also involved in other RNAs modifications, such as rRNA modification [3].