The origins of specificity leading to acetylenases and desaturases are not currently evident from comparisons at the primary sequence level, and residues promoting acetylenase activity have yet to be located.
Specific genes and even genomic regions or chromosomes are also the origin of host specificity in many fungal pathogens.
In order to understand the molecular mechanism of the NER reactions and the origin of this specificity and control we analyzed the architecture of functional NER complexes at nanometer resolution by scanning force microscopy (SFM).
An initial clue to the origin of the specificity of Tat and TAR for recognizing SECs was provided by the crystal structure of the AFF4-P-TEFb complex (Schulze-Gahmen et al., 2013).
Secondly, the hypothesis does not stipulate the nature or origin of relative specificity in myriad biochemical systems or consider the abundance and subcellular localization of E and {S} to a first approximation.
The validated homology models of these GBA-Gαi interactions (Garcia-Marcos et al., 2009, 2011b) offer some clues into the origin of such specificity: despite docking onto the SwII/α3 hydrophobic cleft of Gαi, all GBA-motif containing proteins make additional and unique contacts with Gαi, which generate specificity for each GBA motif.
Our analysis reveals a comprehensive evolutionary picture, which rationalizes the origin of multi-specificity of HU/IHF proteins using sequence and structure-based determinants, which could also be applied to understand differences in binding specificities of other nucleic acid binding proteins.
Follow-up structural and mutational studies revealed the origin of subtype-specificity of the modified compound.
Studies of this type may increase our understanding of the origins of binding specificity in protein ligand complexes and may provide valuable information that can be used in the design of novel protein receptors and/or ligands.
