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Ca2+-induced linker transformation leads to a compact and rigid collagen-binding domain of Clostridium histolyticum collagenase.

ABSTRACT: Clostridium histolyticum collagenase is responsible for extensive tissue destruction in gas gangrene, and its activity is enhanced by calcium ions. The collagen-binding domain is the minimal segment of the enzyme required for binding to insoluble collagen fibrils and for subsequent collagenolysis. The collagen-binding domain is joined to another binding module by a conserved 14-amino-acid linker. The linker undergoes secondary structural transformation from an alpha-helix to a beta-strand and forms a nonprolyl cis-peptide in the presence of calcium ions. In this study, various biophysical methods were utilized to better understand the structure and functional role of the novel calcium-activated linker. Two Ca(2+) ions bind cooperatively with macroscopic association constants of K(1) = 5.01 x 10(5) m(-1) and K(2) = 2.28 x 10(5) m(-1). The chelation of the second calcium ion is enthalpically unfavorable, which could be a result of isomerization of the nonprolyl cis-peptide. The holo protein is more stable than the apo protein against thermal denaturation (DeltaT(m) approximately 20 degrees C) and chemical denaturation (DeltaDeltaG(H2O) approximately 3 kcal x mol(-1) for urea or guanidine HCl denaturation and Delta20% v/v in 2,2,2-trifluoroethanol). The compact holo collagen-binding domain is more resistant to proteolytic digestion than the apo collagen-binding domain. The orientation of the linker appears to play a crucial role in the stability and dynamics of the collagen-binding domain.

SUBMITTER: Philominathan ST

PROVIDER: S-EPMC2782454 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature

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Ca2+-induced linker transformation leads to a compact and rigid collagen-binding domain of Clostridium histolyticum collagenase.

Philominathan Sagaya T L ST Matsushita Osamu O Gensure Robert R Sakon Joshua J

The FEBS journal 20090528 13

Clostridium histolyticum collagenase is responsible for extensive tissue destruction in gas gangrene, and its activity is enhanced by calcium ions. The collagen-binding domain is the minimal segment of the enzyme required for binding to insoluble collagen fibrils and for subsequent collagenolysis. The collagen-binding domain is joined to another binding module by a conserved 14-amino-acid linker. The linker undergoes secondary structural transformation from an alpha-helix to a beta-strand and fo ...[more]

PMID: 19490118

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Project description:To determine the safety and efficacy of collagenase clostridium histolyticum (CCH) injection for the treatment of palmar Dupuytren disease nodules.In this 8-week, double-blind trial, palpable palmar nodules on one hand of adults with Dupuytren disease were selected for treatment. Patients were randomly assigned using an interactive web response system to receive a dose of 0.25 mg, 0.40 mg, or 0.60 mg (1:1:1 ratio) and then allocated to active treatment (CCH) or placebo (4:1 ratio). All patients and investigators were blinded to treatment. One injection was made in the selected nodule on Day 1. Caliper measurements of nodule length and width were performed at screening and at Weeks 4 and 8. Investigator-reported nodular consistency and hardness were evaluated at baseline and Weeks 1, 4, and 8. Investigator-rated patient improvement (1 [very much improved] to 7 [very much worse]) and patient satisfaction were assessed at study end.In the efficacy population (n = 74), percentage changes in area were significantly greater with CCH 0.40 mg (-80.1%, P = 0.0002) and CCH 0.60 mg (-78.2%, P = 0.0003), but not CCH 0.25 mg (-58.3%, P = 0.079), versus placebo (-42.2%) at post-treatment Week 8. Mean change in nodular consistency and hardness were significantly improved with CCH versus placebo at Weeks 4 and 8 (P ? 0.0139 for all). At Week 8, investigator global assessment of improvement was significantly greater with CCH 0.40 mg and 0.60 mg (P ? 0.0014) but not statistically significant with CCH 0.25 mg versus placebo (P = 0.13). Most patients were "very satisfied" or "quite satisfied" with CCH 0.40 mg and 0.60 mg. Contusion/bruising (50.0% to 59.1%) was the most common adverse event with CCH treatment.In patients with Dupuytren disease, a single CCH injection significantly improved palmar nodule size and hardness. The safety of CCH was similar to that observed previously in patients with Dupuytren contracture.ClinicalTrials.gov identifier: NCT02193828 . Date of trial registration: July 2, 2014 to December 5, 2014.

Dataset Information

Ca2+-induced linker transformation leads to a compact and rigid collagen-binding domain of Clostridium histolyticum collagenase.

Publications

Ca2+-induced linker transformation leads to a compact and rigid collagen-binding domain of Clostridium histolyticum collagenase.

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