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The bacterial flagellar motor is made up of several different proteins. Protons must move across the membrane to rotate the flagellum, and this is made possible by a multiprotein complex. A proton channel is formed by the combination of the flagellar motor proteins and powers mechanical spinning. Some non-motile mutants were chosen during a mutant screening. These may have:
  • a)
    mutations in tubulin and actin proteins.
  • b)
    mutations in kinesin proteins.
  • c)
    mutated H
    -ATPase.
  • d)
    mutations in the charged residues lining the ridge of the FliG subunit.
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
The bacterial flagellar motor is made up of several different proteins...
Concept:
  • Bacterial flagella are built from about 25 proteins, most of which serve structural roles in forming the basal body, hook, and filament and only a few of which function in rotation.
  • The stator is formed from the membrane proteins MotA and MotB, which form complexes with the composition MotA4 MotB2, in the membrane surrounding the basal body.
  •  Each motor contains several MotA4MotB2 complexes, which can function independently to produce torque.
  • The rotor proteins involved in rotation are FliG, FliM, and FliN.
Explanation:
​Fig 1: Locations of proteins involved in flagellar rotation

  • FliG is involved most directly in rotation.
  • The C-terminal domain of FliG (FliGC) in particular functions specifically in rotation; deletion of most of this domain prevents rotation but allows flagellar assembly.
  • Conserved charged residues in FliGC have been found to be important for flagellar rotation in a number of species and for control of speed modulation (chemokinesis) in the unidirectional rotary motor of some bacteria.
  • These charged residues of FliG were shown to interact with conserved charged residues in the cytoplasmic domain of the stator protein MotA.
  •  FliG also interacts with FliM  and with the nucleoid-associated DNA-binding protein H-NS.
 hence the correct answer is option 4
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The bacterial flagellar motor is made up of several different proteins. Protons must move across the membrane to rotate the flagellum, and this is made possible by a multiprotein complex. A proton channel is formed by the combination of the flagellar motor proteins and powers mechanical spinning. Some non-motile mutants were chosen during a mutant screening. These may have:a)mutations in tubulin and actin proteins.b)mutations in kinesin proteins.c)mutated H+-ATPase.d)mutations in the charged residues lining the ridge of the FliG subunit.Correct answer is option 'D'. Can you explain this answer?
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The bacterial flagellar motor is made up of several different proteins. Protons must move across the membrane to rotate the flagellum, and this is made possible by a multiprotein complex. A proton channel is formed by the combination of the flagellar motor proteins and powers mechanical spinning. Some non-motile mutants were chosen during a mutant screening. These may have:a)mutations in tubulin and actin proteins.b)mutations in kinesin proteins.c)mutated H+-ATPase.d)mutations in the charged residues lining the ridge of the FliG subunit.Correct answer is option 'D'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about The bacterial flagellar motor is made up of several different proteins. Protons must move across the membrane to rotate the flagellum, and this is made possible by a multiprotein complex. A proton channel is formed by the combination of the flagellar motor proteins and powers mechanical spinning. Some non-motile mutants were chosen during a mutant screening. These may have:a)mutations in tubulin and actin proteins.b)mutations in kinesin proteins.c)mutated H+-ATPase.d)mutations in the charged residues lining the ridge of the FliG subunit.Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The bacterial flagellar motor is made up of several different proteins. Protons must move across the membrane to rotate the flagellum, and this is made possible by a multiprotein complex. A proton channel is formed by the combination of the flagellar motor proteins and powers mechanical spinning. Some non-motile mutants were chosen during a mutant screening. These may have:a)mutations in tubulin and actin proteins.b)mutations in kinesin proteins.c)mutated H+-ATPase.d)mutations in the charged residues lining the ridge of the FliG subunit.Correct answer is option 'D'. Can you explain this answer?.
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