Alternate names of central sugar pathways The hexose monophosphate pathway (HMP) is also known by which name in microbial biochemistry?

Introduction / Context:The hexose monophosphate (HMP) pathway, more commonly called the pentose phosphate pathway (PPP), is a major route for generating NADPH and ribose-5-phosphate. Knowing synonymous names helps map literature references and exam questions that use alternate terminology such as the “phosphogluconate pathway.”

Given Data / Assumptions:

• HMP = PPP, emphasizing oxidation of glucose-6-phosphate via 6-phosphogluconate.
• The question seeks the accepted alias used in textbooks.
• Other listed pathways relate to TCA intermediates, not to HMP/PPP.

Concept / Approach:

In the oxidative branch of PPP, glucose-6-phosphate is converted to 6-phosphogluconate and then to ribulose-5-phosphate, producing NADPH. Because 6-phosphogluconate is a key intermediate, the HMP route has historically been called the phosphogluconate pathway.

Step-by-Step Solution:

Verification / Alternative check:

Biochemistry references list PPP synonyms as “hexose monophosphate shunt” and “phosphogluconate pathway,” confirming the correct alias.

Why Other Options Are Wrong:

• Oxaloacetate/malate/fumarate pathways: These terms are associated with TCA cycle or shuttles, unrelated to HMP.
• Glyoxylate pathway: A TCA bypass for C2 growth, not sugar oxidation for NADPH.

Common Pitfalls:

• Confusing the PPP with glycolysis due to shared hexose substrates; focuses differ (NADPH and pentoses vs. ATP).

Final Answer:

phosphogluconate pathway