We apologize for Proteopedia being slow to respond. For the past two years, a new implementation of Proteopedia has been being built. Soon, it will replace this 18-year old system. All existing content will be moved to the new system at a date that will be announced here.

1slu

From Proteopedia

Jump to: navigation, search

RAT ANIONIC N143H, E151H TRYPSIN COMPLEXED TO A86H ECOTIN

Structural highlights

1slu is a 2 chain structure with sequence from Escherichia coli and Rattus norvegicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 1.8Å
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

ECOT_ECOLI General inhibitor of pancreatic serine proteases: inhibits chymotrypsin, trypsin, elastases, factor X, kallikrein as well as a variety of other proteases. The strength of inhibition does not appear to be correlated with a particular protease specificity.[HAMAP-Rule:MF_00706]

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

The three-dimensional structures of complexes of trypsin N143H, E151H bound to ecotin A86H are determined at 2.0 A resolution via X-ray crystallography in the absence and presence of the transition metals Zn2+, Ni2+, and Cu2+. The binding site for these transition metals was constructed by substitution of key amino acids with histidine at the trypsin-ecotin interface in the S2'/P2' pocket. Three histidine side chains, two on trypsin at positions 143 and 151 and one on ecotin at position 86, anchor the metals and provide extended catalytic recognition for substrates with His in the P2' pocket. Comparisons of the three-dimensional structures show the different geometries that result upon the binding of metal in the engineered tridentate site and suggest a structural basis for the kinetics of the metal-regulated catalysis. Of the three metals, the binding of zinc results in the most favorable binding geometry, not dissimilar to those observed in naturally occurring zinc binding proteins.

X-ray structures of a designed binding site in trypsin show metal-dependent geometry.,Brinen LS, Willett WS, Craik CS, Fletterick RJ Biochemistry. 1996 May 14;35(19):5999-6009. PMID:8634241^[1]

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

References

↑ Brinen LS, Willett WS, Craik CS, Fletterick RJ. X-ray structures of a designed binding site in trypsin show metal-dependent geometry. Biochemistry. 1996 May 14;35(19):5999-6009. PMID:8634241 doi:http://dx.doi.org/10.1021/bi9530200