In eukaryotes, cytochrome c plays a vital role in both aerobic respiration and apoptosis, thus impacting the life and death of a cell. C-type cytochromes are characterized by covalent attachment of a heme co-factor, a modification that is required for its stability and subsequent function. Heme attachment takes place in the mitochondria and is mediated by holocytochrome c synthase, HCCS, the primary component of the eukaryotic cytochrome c biogenesis pathway, also known as System III. Previous studies in animals have shown that defects in HCCS can result in lethality or the human disease microphthalmia with linear skin defects (MLS). Although HCCS was discovered in yeast 25 years ago, the mechanisms underlying HCCS function have yet to be explored, largely due to its poor recombinant expression and instability. Our lab has very recently been successful in overcoming these technical limitations, allowing us to initiate the first comprehensive biochemical analysis of HCCS structure/ function. The catalytic function of HCCS depends on its ability to interact with and coordinate interactions between its substrates, heme and cytochrome c. Therefore, the proposed study seeks to determine which residues and/or domains in HCCS comprise its active site.
Aim 1 analyzes the functional consequences of mutations of highly conserved residues in HCCS by examining perturbations in heme binding and cytochrome c recruitment and maturation. The apocytochrome c substrate-binding site of HCCS is directly assessed in Aim 2 by peptide crosslinking, using a UV-crosslinkable cytochrome c peptide containing the heme-attachment site. These studies will provide the first in-depth mechanistic analysis of HCCS, thus advancing our understanding of mitochondrial bioenergetics. Our results will directly impact what is currently known about diseases like MLS that are caused by HCCS abnormalities, as well as contribute to the body of knowledge concerning the many malfunctions observed in mitochondria in other human conditions.

Public Health Relevance

In humans and other animals, the metalloprotein cytochrome c is intricately involved in processes that sustain the life of a cell, such as aerobic respiration and in processes that regulate the death of a cell, such as apoptosis. Little is known about the pathway that leads to the proper assembly of cytochrome c in the mitochondria. Thus, investigating the components that mediate cytochrome c biogenesis, as proposed here, will provide key insight into a fundamental aspect of eukaryotic cell biology and mitochondrial energy production.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Postdoctoral Individual National Research Service Award (F32)
Project #
5F32GM108278-02
Application #
8865391
Study Section
Special Emphasis Panel (ZRG1-F04-W (20))
Program Officer
Flicker, Paula F
Project Start
2014-05-01
Project End
2016-04-30
Budget Start
2015-05-01
Budget End
2016-04-30
Support Year
2
Fiscal Year
2015
Total Cost
$54,194
Indirect Cost
Name
Washington University
Department
Biology
Type
Schools of Arts and Sciences
DUNS #
068552207
City
Saint Louis
State
MO
Country
United States
Zip Code
63130
Babbitt, Shalon E; Hsu, Jennifer; Mendez, Deanna L et al. (2017) Biosynthesis of Single Thioether c-Type Cytochromes Provides Insight into Mechanisms Intrinsic to Holocytochrome c Synthase (HCCS). Biochemistry 56:3337-3346
Mendez, Deanna L; Babbitt, Shalon E; King, Jeremy D et al. (2017) Engineered holocytochrome c synthases that biosynthesize new cytochromes c. Proc Natl Acad Sci U S A 114:2235-2240
Babbitt, Shalon E; Hsu, Jennifer; Kranz, Robert G (2016) Molecular Basis Behind Inability of Mitochondrial Holocytochrome c Synthase to Mature Bacterial Cytochromes: DEFINING A CRITICAL ROLE FOR CYTOCHROME c ? HELIX-1. J Biol Chem 291:17523-34
Babbitt, Shalon E; Sutherland, Molly C; San Francisco, Brian et al. (2015) Mitochondrial cytochrome c biogenesis: no longer an enigma. Trends Biochem Sci 40:446-55