A 1.85 Å crystal structure of Mg2+-activated protease domain reveals Mg2+-dependent remodeling of a substrate-binding loop and a potential metal-binding site near the Ser-Lys catalytic dyad, supported by biophysical binding assays and molecular dynamics simulations.
It was proposed to form intermonomer interfaces among three subunits together with DNase I-binding loop and a hydrophobic loop Phe-Ile (17, 18).
Distinct from non-vertebrate cryptochromes and their closely related DNA photolyases, mammalian CRYs feature an open and dynamic FAD-binding pocket characterized by a flexible phosphate-binding loop and a moderate affinity of FAD binding.
Of these, sPLA2s belonging to the group I/II/V/X collection are closely related 14 19-kDa 14 19-kDaof secreted enzymes with a highly conserved Ca2+-binding looproteinsHis-Asp catalytic site.
Most of the dockerin-containing proteins have two repeats of the duplicated sequence, whereby each repeat contains a predicted Ca+2-binding loop and an alpha-helix, with a linker separating the two repeats.
To probe interactions with these and other residues in the 5-HT3 receptor, we mutated W90, R92, and Y94 in loop D, S114 (not in a binding loop), and Y141, Y143, Q151, and Y153 in loop E, all of which are within 5 Å of varenicline.
Phospholipases are an important enzyme involved in the inflammatory cascade mechanism having a conserved globular structure with active site, calcium binding loop, and hydrophobic channel.
These regions are summarized in Fig. 6, and include the catalytic loop, magnesium binding loop and the F-helix region.
Analysis of the conserved domain of ExoU revealed a patatin-like domain, containing a glycine-rich nucleotide binding loop motif and a lipase motif with catalytically active serine and aspartate within its N-terminal primary sequence [ 31].
The unfolded region encompasses discontinuous sequence segments that cluster in the 3D structure of the native protein forming the FMN cofactor binding loops and the binding site of a variety of partner proteins.
