2fmj

From Proteopedia

220-loop mutant of streptomyces griseus trypsin

Structural highlights

2fmj is a 1 chain structure with sequence from Streptomyces griseus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.65Å
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TRYP_STRGR

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Serine proteases of the chymotrypsin family show a dichotomous amino acid distribution for residue 225. Enzymes carrying Tyr at position 225 are activated by Na(+), whereas those carrying Pro are devoid of Na(+) binding and activation. Previous studies have demonstrated that the Y225P conversion is sufficient to abrogate Na(+) activation in several enzymes. However, the reverse substitution P225Y is necessary but not sufficient to introduce Na(+) binding and activation. Here we report that Streptomyces griseus trypsin, carrying Pro-225, can be engineered into a Na(+)-activated enzyme by replacing residues in the 170, 186, and 220 loops to those of coagulation factor Xa. The findings represent the first instance of an engineered Na(+)-activated enzyme and a proof of principle that should enable the design of other proteases with enhanced catalytic activity and allosteric regulation mediated by monovalent cation binding.

Conversion of trypsin into a Na(+)-activated enzyme.,Page MJ, Bleackley MR, Wong S, MacGillivray RT, Di Cera E Biochemistry. 2006 Mar 7;45(9):2987-93. PMID:16503653^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Page MJ, Bleackley MR, Wong S, MacGillivray RT, Di Cera E. Conversion of trypsin into a Na(+)-activated enzyme. Biochemistry. 2006 Mar 7;45(9):2987-93. PMID:16503653 doi:10.1021/bi052481a