Effect of polyanions on the unfolding of acidic fibroblast growth factor.


The urea-induced unfolding of acidic fibroblast growth factor (aFGF) in the presence and absence of various polyanions has been quantitatively examined by fluorescence spectroscopy. In the absence of a stabilizing polyanion, the apparent free energy of unfolding of aFGF is 6.5 kcal mol-1. The presence of equimolar or greater amounts of heparin stabilizes aFGF from unfolding by more than 2.5 kcal mol-1 and slows the rate of unfolding by greater than 2000-fold. The ability of heparin to stabilize aFGF is critically dependent upon many factors including the number of aFGF molecules bound to the heparin chain, ionic strength, temperature, and the extent of sulfation of the polysaccharide. The presence of similar amounts of other polyanions such as sulfated beta-cyclodextrin or heparan sulfate also stabilizes aFGF to a similar extent as heparin. Additional experiments demonstrate that increasing charge density enhances the ability of polyanions such as sulfated beta-cyclodextrins, phosphorylated inositols, and modified heparins to protect aFGF from urea-induced unfolding. Study holds ProTherm entries: 4576, 4577, 4578, 4579, 4580 Extra Details: polyanions; sulfation; sulfated beta-cyclodextrin; heparin

Submission Details

ID: pPduruz34

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:26 p.m.

Version: 1

Publication Details
Burke CJ;Volkin DB;Mach H;Middaugh CR,Biochemistry (1993) Effect of polyanions on the unfolding of acidic fibroblast growth factor. PMID:7686045
Additional Information

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Fibroblast growth factor 2 P09038 FGF2_HUMAN
100.0 Fibroblast growth factor 2 Q5IS69 FGF2_PANTR
98.7 Fibroblast growth factor 2 P03969 FGF2_BOVIN
98.1 Fibroblast growth factor 2 P20003 FGF2_SHEEP
97.3 Fibroblast growth factor 2 P13109 FGF2_RAT
96.6 Fibroblast growth factor 2 P15655 FGF2_MOUSE
92.9 Fibroblast growth factor 2 P48798 FGF2_MONDO
92.2 Fibroblast growth factor 2 P48800 FGF2_CHICK
99.3 Fibroblast growth factor 2 P48799 FGF2_RABIT
91.1 Fibroblast growth factor 2 Q60487 FGF2_CAVPO