5FPD

Structure of heat shock-related 70kDA protein 2 with small-molecule ligand pyrazine-2-carboxamide (AT513) in an alternate binding site.

Summary for 5FPD

• Entry DOI: 10.2210/pdb5fpd/pdb
• Related: 5FP5 5FP6 5FPE 5FPM 5FPN 5FPO 5FPR 5FPS 5FPT 5FPY
• Descriptor: HEAT SHOCK-RELATED 70KDA PROTEIN 2, PYRAZINE-2-CARBOXAMIDE (3 entities in total)
• Functional Keywords: heat shock-related protein, heat shock, chaperone, hsp70, hspa2, protein-ligand complex, fragment screening, alternate binding site, at513.
• Biological source: HOMO SAPIENS (HUMAN)
• Cellular location: Cytoplasm, cytoskeleton, spindle : P54652
• Total number of polymer chains: 2
• Total formula weight: 85012.23

Authors

Jhoti, H.,Ludlow, R.F.,Patel, S.,Saini, H.K.,Tickle, I.J.,Verdonk, M. (deposition date: 2015-11-28, release date: 2015-12-16, Last modification date: 2024-01-10)

Primary citation

Ludlow, R.F.,Verdonk, M.L.,Saini, H.K.,Tickle, I.J.,Jhoti, H.
Detection of Secondary Binding Sites in Proteins Using Fragment Screening.
Proc.Natl.Acad.Sci.USA, 112:15910-, 2015

PubMed Abstract: Proteins need to be tightly regulated as they control biological processes in most normal cellular functions. The precise mechanisms of regulation are rarely completely understood but can involve binding of endogenous ligands and/or partner proteins at specific locations on a protein that can modulate function. Often, these additional secondary binding sites appear separate to the primary binding site, which, for example for an enzyme, may bind a substrate. In previous work, we have uncovered several examples in which secondary binding sites were discovered on proteins using fragment screening approaches. In each case, we were able to establish that the newly identified secondary binding site was biologically relevant as it was able to modulate function by the binding of a small molecule. In this study, we investigate how often secondary binding sites are located on proteins by analyzing 24 protein targets for which we have performed a fragment screen using X-ray crystallography. Our analysis shows that, surprisingly, the majority of proteins contain secondary binding sites based on their ability to bind fragments. Furthermore, sequence analysis of these previously unknown sites indicate high conservation, which suggests that they may have a biological function, perhaps via an allosteric mechanism. Comparing the physicochemical properties of the secondary sites with known primary ligand binding sites also shows broad similarities indicating that many of the secondary sites may be druggable in nature with small molecules that could provide new opportunities to modulate potential therapeutic targets.

PubMed: 26655740
DOI: 10.1073/PNAS.1518946112

Experimental method

X-RAY DIFFRACTION (1.97 Å)