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Shahbaaz M, Ahmad F, Imtaiyaz Hassan M. Structure-based functional annotation of putative conserved proteins having lyase activity from Haemophilus influenzae. 3 Biotech. 2014;5(3):317-336doi: 10.1007/s13205-014-0231-z.
Shahbaaz, M., Ahmad, F., & Imtaiyaz Hassan, M. (2015). Structure-based functional annotation of putative conserved proteins having lyase activity from Haemophilus influenzae. 3 Biotech, 5(3), 317-336. https://doi.org/10.1007/s13205-014-0231-z
Shahbaaz, Mohd, et al. "Structure-based functional annotation of putative conserved proteins having lyase activity from Haemophilus influenzae." 3 Biotech vol. 5,3 (2015): 317-336. doi: https://doi.org/10.1007/s13205-014-0231-z
Shahbaaz M, Ahmad F, Imtaiyaz Hassan M. Structure-based functional annotation of putative conserved proteins having lyase activity from Haemophilus influenzae. 3 Biotech. 2015 Jun;5(3):317-336. doi: 10.1007/s13205-014-0231-z. Epub 2014 Jun 17. PMID: 28324295; PMCID: PMC4434415.
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3 Biotech. 2015 Jun;5(3):317-336. doi: 10.1007/s13205-014-0231-z. Epub 2014 Jun 17.

Structure-based functional annotation of putative conserved proteins having lyase activity from Haemophilus influenzae.

3 Biotech

Mohd Shahbaaz, Faizan Ahmad, Md Imtaiyaz Hassan

Affiliations

  1. Department of Computer Science, Jamia Millia Islamia, New Delhi, 110025, India.
  2. Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110025, India.
  3. Center for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, Jamia Nagar, New Delhi, 110025, India. [email protected].

PMID: 28324295 PMCID: PMC4434415 DOI: 10.1007/s13205-014-0231-z

Abstract

Haemophilus influenzae is a small pleomorphic Gram-negative bacteria which causes several chronic diseases, including bacteremia, meningitis, cellulitis, epiglottitis, septic arthritis, pneumonia, and empyema. Here we extensively analyzed the sequenced genome of H. influenzae strain Rd KW20 using protein family databases, protein structure prediction, pathways and genome context methods to assign a precise function to proteins whose functions are unknown. These proteins are termed as hypothetical proteins (HPs), for which no experimental information is available. Function prediction of these proteins would surely be supportive to precisely understand the biochemical pathways and mechanism of pathogenesis of Haemophilus influenzae. During the extensive analysis of H. influenzae genome, we found the presence of eight HPs showing lyase activity. Subsequently, we modeled and analyzed three-dimensional structure of all these HPs to determine their functions more precisely. We found these HPs possess cystathionine-β-synthase, cyclase, carboxymuconolactone decarboxylase, pseudouridine synthase A and C, D-tagatose-1,6-bisphosphate aldolase and aminodeoxychorismate lyase-like features, indicating their corresponding functions in the H. influenzae. Lyases are actively involved in the regulation of biosynthesis of various hormones, metabolic pathways, signal transduction, and DNA repair. Lyases are also considered as a key player for various biological processes. These enzymes are critically essential for the survival and pathogenesis of H. influenzae and, therefore, these enzymes may be considered as a potential target for structure-based rational drug design. Our structure-function relationship analysis will be useful to search and design potential lead molecules based on the structure of these lyases, for drug design and discovery.

Keywords: Function prediction; Gene annotation; Haemophilus influenzae; Hypothetical protein; Sequence analysis; Structure analysis; Structure–function relationship

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