B1510_module3_5_preoxygen_metabolism

B1510_module3_5_preoxygen_metabolism - Georgia Tech School...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Georgia Tech School of Biology Fall 2009 Biology 1510 Biology 1510 An evolutionary approach to energy metabolism • What metabolic pathways were present in the LUCA? – Pathways common to all 3 domains – Pathways found in organisms that live in environments that may have existed >3 billion years ago • What new metabolic pathways evolved in response to global environmental change? Georgia Tech School of Biology Fall 2009 Biology 1510 Biology 1510 Redox Stratification in Marine Sediments (Jorgensen 2000, Fig. 5.11) Georgia Tech School of Biology Fall 2009 Biology 1510 Biology 1510 Oxidation-reduction is common core of energy metabolism Higher-energy molecules are oxidized (electrons are removed) Lower-energy molecules are reduced (accept electrons) Catabolic pathways feature a series of redox reactions (electron-transfer reactions) NAD+/NADH is the primary electron carrier Georgia Tech School of Biology Fall 2009 Biology 1510 Oxidized and reduced forms of NAD NAD = nicotinamide adenine dinucleotide. For NADH + H+ +1/2 O2 ↔ NAD+ + H2O, ΔGo = -52.4 kcal/mol. Georgia Tech School of Biology Fall 2009 Biology 1510 Biology 1510 Respiration: electrons from NADH charge a membrane pH gradient NADH Electron donors {[CH2O], H2, H2S, CH4, Fe2+, etc.} Terminal electron acceptors O2, NO3-, SO42-, Mn4+, Fe3+, CO2, etc....
View Full Document

This note was uploaded on 11/12/2009 for the course BIO 1510 taught by Professor Unknown during the Fall '07 term at Georgia Tech.

Page1 / 19

B1510_module3_5_preoxygen_metabolism - Georgia Tech School...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online