Computational modeling and functional characterization of a GgChi: A class III chitinase from corms of Gladiolus grandiflorus

Maria Rafiq, Ashiq Hussain, Kausar Hussain Shah, Qamar Saeed, Muhammad Umair Sial, Zahid Ali, Friedrich Buck, Richard E Goodman, Binish Khaliq, Uzma Ishaq, Mirza Ahsen Baig, Aisha Munawar, Seema Mahmood, Ahmed Akrem

Research output: Contribution to journalArticle

Abstract

The present study describes the predicted model and functional characterization of an endochitinase (30 kDa) from corms of Gladiolus grandiflorus. ESI-QTOF-MS generated peptide showed 96% sequence homology with family 18, Class III acidic endochitinase of Gladiolus gandavensis. Purified G. grandiflorus chitinase (GgChi) hydrolyzed 4-methylumbelliferyl β-D-N,N′,N′′-triacetylchitotriose substrate showing specific endochitinase activity. Since no structural details of GgChi were available in the Protein Data Bank (PDB), a homology model was predicted using the coordinate information of Crocus vernus chitinase (PDB ID: 3SIM). Ramachandran plot indicated 84.5% in most favored region, 14.8% in additional and 0.6% in generously allowed region while no residue in disallowed region. The predicted structure indicated a highly conserved (β/α) 8 (TIM barrel) structure similar to the family 18, class III chitinases. The GgChi also showed sequence and structural homologies with other active chitinases. The GgChi (50 μg/disc) showed no antibacterial activity, but did provide mild growth inhibition of phytopathogenic fungus Fusarium oxysporum at a concentration of 500 μg/well Similarly, insect toxicity bioassays of GgChi (50 μg) against nymphs of Bemisia tabaci showed 14% reduction in adult emergence and 14% increase in mortality rate in comparison to control values. The GgChi (1.5 mg) protein showed significant reduction in a population of flour beetle (Tribolium castaneum) after 35 days, but lower reactivity against rice weevil (Sitophilus oryzae). The results of this study provide detai.led insight on functional characterization of a family 18 class III acidic plant endochitinase.

Original languageEnglish (US)
Pages (from-to)673-683
Number of pages11
JournalKaohsiung Journal of Medical Sciences
Volume34
Issue number12
DOIs
StatePublished - Dec 1 2018

Fingerprint

Chitinases
Sequence Homology
class III chitinase
Databases
Tribolium
Weevils
Nymph
Proteins
Beetles
Fusarium
Flour
Biological Assay
Insects
Fungi

Keywords

  • Antibacterial
  • Antifungal
  • Endochitinase
  • Gladiolus grandiflorus
  • TIM barrel

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Computational modeling and functional characterization of a GgChi : A class III chitinase from corms of Gladiolus grandiflorus. / Rafiq, Maria; Hussain, Ashiq; Shah, Kausar Hussain; Saeed, Qamar; Sial, Muhammad Umair; Ali, Zahid; Buck, Friedrich; Goodman, Richard E; Khaliq, Binish; Ishaq, Uzma; Baig, Mirza Ahsen; Munawar, Aisha; Mahmood, Seema; Akrem, Ahmed.

In: Kaohsiung Journal of Medical Sciences, Vol. 34, No. 12, 01.12.2018, p. 673-683.

Research output: Contribution to journalArticle

Rafiq, M, Hussain, A, Shah, KH, Saeed, Q, Sial, MU, Ali, Z, Buck, F, Goodman, RE, Khaliq, B, Ishaq, U, Baig, MA, Munawar, A, Mahmood, S & Akrem, A 2018, 'Computational modeling and functional characterization of a GgChi: A class III chitinase from corms of Gladiolus grandiflorus', Kaohsiung Journal of Medical Sciences, vol. 34, no. 12, pp. 673-683. https://doi.org/10.1016/j.kjms.2018.08.003
Rafiq, Maria ; Hussain, Ashiq ; Shah, Kausar Hussain ; Saeed, Qamar ; Sial, Muhammad Umair ; Ali, Zahid ; Buck, Friedrich ; Goodman, Richard E ; Khaliq, Binish ; Ishaq, Uzma ; Baig, Mirza Ahsen ; Munawar, Aisha ; Mahmood, Seema ; Akrem, Ahmed. / Computational modeling and functional characterization of a GgChi : A class III chitinase from corms of Gladiolus grandiflorus. In: Kaohsiung Journal of Medical Sciences. 2018 ; Vol. 34, No. 12. pp. 673-683.
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AU - Ali, Zahid

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AU - Khaliq, Binish

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