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===Substructure 1 of inhA===
===Substructure 1 of inhA===
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Substructure one consists of 6 parallel β strands and 4 α helices interwoven together to form a core α/β structure that contains the n-terminal domain<ref name ="making drugs for inhA">PMID:5882878</ref>.
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<scene name='Sandbox_Reserved_321/Substructure_1/1'>Substructure 1</scene> consists of 6 parallel β strands and 4 α helices interwoven together to form a core α/β structure that contains the n-terminal domain<ref name ="making drugs for inhA">PMID:5882878</ref>.
The first substructure can be further broken down into two sections, the <scene name='Sandbox_Reserved_321/Substructure1section1/7'>first section</scene> consisting of two β strands <scene name='Sandbox_Reserved_321/B-1_and_b-2/4'>(B-1 and B-2)</scene>and two short α helicies <scene name='Sandbox_Reserved_321/A-1_and_a-2/2'>(A-1 and A-2)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>.
The first substructure can be further broken down into two sections, the <scene name='Sandbox_Reserved_321/Substructure1section1/7'>first section</scene> consisting of two β strands <scene name='Sandbox_Reserved_321/B-1_and_b-2/4'>(B-1 and B-2)</scene>and two short α helicies <scene name='Sandbox_Reserved_321/A-1_and_a-2/2'>(A-1 and A-2)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>.
The first section is connected to the <scene name='Sandbox_Reserved_321/Section2substructure1/1'>second section</scene> by a β strand <scene name='Sandbox_Reserved_321/B-3/1'>(B-3)</scene> that crosses over the two domains, and leads into the second section initiating at the third α helix <scene name='Sandbox_Reserved_321/A-3/1'>(A-3)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>. (A-3) is connected by a long loop to a 14 residue β strand <scene name='Sandbox_Reserved_321/B-4/2'>(B-4)</scene>that then leads into the fourth α helix <scene name='Sandbox_Reserved_321/A-4/2'>(A-4)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>. A-4 then leads into a fifth strand β <scene name='Sandbox_Reserved_321/B-5/1'>(B-5)</scene>, followed by a 25 residue α helix <scene name='Sandbox_Reserved_321/A-5/2'>(A-5)</scene>, and into the final strand β <scene name='Sandbox_Reserved_321/B-6/1'>(B-6)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>.
The first section is connected to the <scene name='Sandbox_Reserved_321/Section2substructure1/1'>second section</scene> by a β strand <scene name='Sandbox_Reserved_321/B-3/1'>(B-3)</scene> that crosses over the two domains, and leads into the second section initiating at the third α helix <scene name='Sandbox_Reserved_321/A-3/1'>(A-3)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>. (A-3) is connected by a long loop to a 14 residue β strand <scene name='Sandbox_Reserved_321/B-4/2'>(B-4)</scene>that then leads into the fourth α helix <scene name='Sandbox_Reserved_321/A-4/2'>(A-4)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>. A-4 then leads into a fifth strand β <scene name='Sandbox_Reserved_321/B-5/1'>(B-5)</scene>, followed by a 25 residue α helix <scene name='Sandbox_Reserved_321/A-5/2'>(A-5)</scene>, and into the final strand β <scene name='Sandbox_Reserved_321/B-6/1'>(B-6)</scene><ref name ="making drugs for inhA">PMID:5882878</ref>.
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===Substructure 2 of inhA===
===Substructure 2 of inhA===
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Substructure two contains the c-terminal region of the molecule and consists of a small β strand (B-7), and two α helicies (A-6 and A-7) which are conected by a short five residue loop<ref name ="making drugs for inhA">PMID:5882878</ref>.
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<scene name='Sandbox_Reserved_321/Substructure_2/1'>Substructure 2</scene> contains the c-terminal region of the molecule and consists of a small β strand (B-7), and two α helicies (A-6 and A-7) which are conected by a short five residue loop<ref name ="making drugs for inhA">PMID:5882878</ref>.
==Physiological Function==
==Physiological Function==

Revision as of 04:37, 31 March 2011

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InhA

by Kelly Hrywkiw

Image:Secondary Structure of inhA.png
Secondary structure succession inhA.


PDB ID 2h9i

Drag the structure with the mouse to rotate
2h9i, resolution 2.20Å ()
Ligands:
Gene: inhA (Mycobacterium tuberculosis)
Activity: [acyl-carrier-protein_reductase_(NADH) Enoyl-[acyl-carrier-protein] reductase (NADH)], with EC number 1.3.1.9
Related: 1zid
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Contents

Introduction

The enzyme inhA is coded from the inhA gene that is simillar in sequence to the Salmonella typhimuriumgene which plays a role in fatty acid biosynthesis [1]. Inha is an NADH dependent trans enoyl-acyl ACP carrier protein that plays a role in the sysnthesis of Mycolic Acid, and is part of a short-chain dehydrogenase/reductase family [2][3]. Mycolic acids are long chain fatty acids that are essential in cell wall formation of the human pathogen Mycobacterium tuberculosisas well as other mycobateria such as Mycobacterium leprae[4]. Inha has been propsed as the target of the thionamide drugs, ethionamide (ETH) and isoniazid (INH), which have been used in treatment of mycobacterial infections [3].

Structure of inhA

The overall strucuture of the inhA enzyme of Mycobacterium tuberculosis consists of a single domain with two substructures that are connected by short loop[1].

Substructure 1 of inhA

consists of 6 parallel β strands and 4 α helices interwoven together to form a core α/β structure that contains the n-terminal domain[1]. The first substructure can be further broken down into two sections, the consisting of two β strands and two short α helicies [1]. The first section is connected to the by a β strand that crosses over the two domains, and leads into the second section initiating at the third α helix [1]. (A-3) is connected by a long loop to a 14 residue β strand that then leads into the fourth α helix [1]. A-4 then leads into a fifth strand β , followed by a 25 residue α helix , and into the final strand β [1].

Substructure 2 of inhA

contains the c-terminal region of the molecule and consists of a small β strand (B-7), and two α helicies (A-6 and A-7) which are conected by a short five residue loop[1].

Physiological Function

Role in the Mycolic Acid Pathway

Protein Superfamilly

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Strohmaier K, Streissle G, Clemm de Noronha S. [On the determination of size of early summer meningoencephalitis]. Arch Gesamte Virusforsch. 1965;17(2):300-3. PMID:5882878
  2. ↑ Wang F, Langley R, Gulten G, Dover LG, Besra GS, Jacobs WR Jr, Sacchettini JC. Mechanism of thioamide drug action against tuberculosis and leprosy. J Exp Med. 2007 Jan 22;204(1):73-8. Epub 2007 Jan 16. PMID:17227913 doi:10.1084/jem.20062100
  3. ↑ 3.0 3.1 Molle V, Gulten G, Vilcheze C, Veyron-Churlet R, Zanella-Cleon I, Sacchettini JC, Jacobs WR Jr, Kremer L. Phosphorylation of InhA inhibits mycolic acid biosynthesis and growth of Mycobacterium tuberculosis. Mol Microbiol. 2010 Dec;78(6):1591-605. doi:, 10.1111/j.1365-2958.2010.07446.x. Epub 2010 Nov 9. PMID:21143326 doi:10.1111/j.1365-2958.2010.07446.x
  4. ↑ . PMID:216315890657
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