Bringing the

Transformative Power of

Synthetic Biology to

Medicine

Corporate Presentation

January 2021

© 2021 SYNLOGIC. ALL RIGHTS RESERVED. | 1

Forward Looking Statements

This presentation contains "forward-looking statements" that involve substantial risks and uncertainties for purposes of the safe harbor provided by the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included in this presentation regarding strategy, future operations, future financial position, future revenue, projected expenses, prospects, plans and objectives of management are forward- looking statements. In addition, when or if used in this presentation, the words "may," "could," "should," "anticipate," "believe," "estimate," "expect," "intend," "plan," "predict" and similar expressions and their variants may identify forward-looking statements. Examples of forward-looking statements include, but are not limited to, the approach we are taking to discover and develop novel therapeutics using synthetic biology; statements regarding the potential of our platform to develop therapeutics to address a wide range of diseases, including: metabolic diseases, inflammatory and immune disorders, and cancer; the future clinical development of Synthetic Biotic medicines; the potential of our technology to treat phenylketonuria and cancer; the expected timing of our anticipated clinical trial initiations and availability of clinical data; the benefit of orphan drug and fast track status; the adequacy of our capital to support our future operations and our ability to successfully initiate and complete clinical trials; the results of our collaborations; and the difficulty in predicting the time and cost of development of our product candidates. Actual results could differ materially from those contained in any forward-looking statement as a result of various factors, including, without limitation: the uncertainties inherent in the preclinical development process; our ability to protect our intellectual property rights; and legislative, regulatory, political and economic developments, as well as those risks identified under the heading "Risk Factors" in our filings with the SEC. The foregoing review of important factors that could cause actual events to differ from expectations should not be construed as exhaustive and should be read in conjunction with statements that are included herein and elsewhere, including the risk factors included in our quarterly report on Form 10-Q filed with the SEC on May 8, 2020, and in any subsequent filings we make with the SEC. The forward-looking statements contained in this presentation reflect our current views with respect to future events. We anticipate that subsequent events and developments will cause our views to change. However, while we may elect to update these forward-looking statements in the future, we specifically disclaim any obligation to do so. These forward-looking statements should not be relied upon as representing our view as of any date subsequent to the date hereof.

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 2

Recent Progress: Execution Across the Portfolio

Metabolic Programs

Rapidly progressed metabolic programs

  • SYNB1618 in PKU Phase 2 SynPheny-1 study initiated
  • IND for SYNB8802 in Enteric Hyperoxaluria opened and Phase 1 study initiated

Advanced preclinical work in additional undisclosed metabolic indications

Immunomodulation

Immunomodulation in immunology and oncology

  • SYNB1891 monotherapy demonstrated target engagement and meaningful pharmacodynamic effects
  • Advancing to combination with anti-PD1 Advanced exploratory work in IBD

We are the premier Synthetic Biology platform engineering bacterial Synthetic Biotic medicines

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 3

A New Class of Medicines

We Rationally Design Bacteria

Bacteria and Humans Co-Evolved and Co-Exist

To Provide Clinical Benefit

The Result is Synthetic Biotic Medicines with Potent and Programmable Therapeutic Effects

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 4

Building a Diverse Portfolio of Synthetic Biotic Medicines

Platform for Clinical Benefit Across Multiple Disease States

Enabling Engine

Validated

Core Differentiating

Biological

Capabilities

Targets

Where a

Synthetic Biology

Internal + Ginkgo

Synthetic Biotic

medicine is

uniquelyManufacturing of live

Internal Focus:

Metabolic Programs

Consumption of toxic metabolites from

the GI tract

External & Collaboration Focus:

Immunomodulation

positioned to

Synthetic Biotics

impact patients

Regulatory, Translational

& Clinical Dev.

Immunology and oncology: Leveraging the ability of bacteria to interact with the immune system

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 5

Enabling Engine

Core Differentiating

Capabilities

Synthetic Biology

Internal + Ginkgo

Manufacturing of live

Synthetic Biotics

Regulatory, Translational

& Clinical Dev.

Enabling Engine: Driver for Success

Clinical Evidence

Internal Pipeline Focus

  • >200 humans dosed with Synthetic BioticRa200 HVsmedicinesand pati nts dosed with

Synthetic biotic medicine

4 INDs opened with the U.S. FDA

3 INDs opened with the FDA in

addition to supportive regulatory

  • Supportive regulatory feedback fromfeedbackglobalonagenciesapproach from global

regulatory agencies

  • Safe (>100 years of human experience)Internalprobioticprocess developmentbacterial andchassis

GMP manufacturing capabilities….

Core Technology

Collaborations and agreements with

large pharma partners….

  • Deep synthetic biology expertise withreGinkgometabolicBioworksd seases basedcollaborationon

consumption of toxic metabolites

from the GI tract

Modular and reusable synthetic biology components enable iterative,

efficient platform learning

  • Internal process development and GMP manufacturing capabilities

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 6

Robust Pipeline

Exploratory

Preclinical

IND-Enabling

Phase 1

Phase 2

Studies

Phenylketonuria

Enteric Hyperoxaluria Other Metabolic Programs

SYNB1618

SYNB8802

Immuno-Oncology Solid Tumors

SYNB1891

Inflammatory Bowel Disease

Vaccines

Other Inflammation Programs

Key

Metabolic Diseases

Immunomodulation

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 7

Synlogic Entering Data Rich Period in the Clinic

Expected Milestone

2020

2021

early

mid

late

SYNB1618

Initiate Ph.2 study in PKU patients

initiated

PKU

Ph.2 Phe-loweringread-out

SYNB8802

Initiate Ph.1 study in HV and patients

initiated

HOX

Ph.1 patient read-out

Ph.1 Monotherapy interim update

completed

SYNB1891

Initiate Ph.1 combination study arm

I/O

Ph.1 combination therapy read-out

Significant Clinical Readouts within our Current Cash Window

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 8

Why Metabolic Diseases For Synthetic Biotic Medicines?

Validated Biology

Platform Proof of Mechanism

Diseases with known

PKU program demonstrated we

pathophysiology

can consume toxic metabolites

in the GI tract

Dietary intervention provides

support for GI-based

Subsequent programs build on

approach

experience

Unique Advantage of SYNB

Unmet Medical Need

Bacteria act catalytically

Across both inherited and

acquired metabolic diseases

Contain multiple enzyme pathways

Are protected from digestion

within the GI tract

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 9

Phenylketonuria (PKU)

Emerging treatment

options will continue to

leave many patients

behind

SYNB1618 demonstrates potential to lower Phe in PKU patients

Phase 2 Phe-lowering

trial initiated

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 10

Synlogic's Approach to Phenylketonuria (PKU)

Synthetic Biotic Mechanism of Action

Consume Phe in the GI Tract

Reduce Phe in the blood

Julia, living with PKU

PKU Program Status

SYNB1618 was able to consume Phe in healthy volunteers

Synlogic has initiated a Phase 2 Study in PKU patients (SynPheny-1)

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 11

Living with PKU:

Parents Expect Their Children to Achieve Their Full Potential

Prospect of severe mental disability and

Early diagnosis and strict diet control enables

institutionalization.

better Phe management.

Parents wanted PKU child to avoid

Parents expect PKU child to achieve full potential,

institutionalized care before adulthood.

college attendance, self-support.

Reality: 25% - 65% of Patients Still Stuggle to Maintain Blood Phe within Target Range

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 12

SYNB1618 is Uniquely Positioned to Address Needs Across Ages and Genotypes

Adult Only

Partial Responders (1/3rd)

All Ages, Genotypes

Chronic Daily

Long-acting Chronic

Gene Therapies

Daily Oral

Daily Oral

Daily Oral

Marketed

Development

Patient Segment1

Marketed

At Ph1/2 or earlier

Marketed

Phase 3

Ph 2

Ph 1

Infant 0-1

N= ~500

Peds 2-11

N= ~2,800

Peds 12-18

N= ~1,700

Adults

N= 11,5001

Under REMS

Bh4 Responsive Only

program

1. Includes 7,500 "lost to follow up" adult patients

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 13

SYNB1618 In The Clinic: D5 Tracer Data in Healthy Volunteers

D5 Phe Converted to D5 TCA

D5 TCA Converted to D5 HA

Plasma D5 Phe Blunted

D5 TCA AUC

20

15

μM*h

10

AUC

5

BLQ

0

o

2

2

b

1

1

e

e

e

c

1

2

la

P

Treatment

Data are means and 90% CI

Placebo 1e12 2e12

Urinary HA (mg)

Urinary D5 HA

250 200 150 100 50 0

o

12

2

eb

1

e

e

c

1

2

a

l

P

Treatment

Placebo 1e12 2e12

%CFB D5 Phe

D5 Phe % CFB

20 10 0 -10-20-30-40

o

2

2

b

1

1

e

e

e

ac

1

2

Pl

Treatment

Placebo 1e12 2e12

SYNB1618 Mechanism Confirmed: Accessed D5 Phe Tracer in Gut & Lowered Plasma D5 Phe

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 14

SynPheny-1 Phase 2 Proof of Concept Study in PKU

Fasting

Phe

Diet run-in

6 days D5-Phe

AUC

Fasting

Dose 1

Dose 2

Dose 3

Phe Dose 4

1e11

3e11

1e12

2e12

3 days

3 days

7 days

2 days

D5-Phe

AUC

  • Demonstrate Phe Lowering in PKU Patients
    • Plasma Phe lowering in fasted state at 1 x 1012 live cells over 7 days
    • Post meal D5-Phe AUC lowering at 2 x 1012 live cells (not impacted by diet)
  • Validate PD Model
    • Understand relationship of strain specific biomarkers with plasma Phe lowering
  • Safety and Tolerability

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 15

Patient-Centered Clinical Trial Design & Execution

Directly informed by patient feedback on executing trials in the COVID era

Flexible design allowing home-based or office-based visits

Rigorous & personalized diet control to ensure consistent Phe intake, including 6-dayrun-in

Dose ramp to improve tolerability & compliance

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 16

Enteric Hyperoxaluria

Enteric Hyperoxaluria results in significant kidney damage with no available treatment options

SYNB8802 has the potential

SYNB8802 Phase 1 clinical

to meaningfully lower

study initiated ahead of

urinary oxalate levels

schedule

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 17

Synlogic's Approach to Enteric Hyperoxaluria

Dietary Sources of Oxalate

Synthetic Biotic Mechanism of Action

Consume Oxalate in the GI Tract

Reduce Oxalate in the urine

Hyperoxaluria

Kidney stones

Enteric Hyperoxaluria Program Status

SYNB8802 was able to consume oxalate in multiple animal models

Synlogic has initiated a Phase 1 Study in healthy volunteers

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 18

Hyperoxaluria: Primary vs. Enteric

Primary Hyperoxaluria

Enteric Hyperoxaluria

Pathology

Urinary Oxalate Levels

Onset

Clinical Mgmt

U.S. Epidemiology

Key Players

Family of autosomal recessive monogenic

Pathogenic hyperabsorption of dietary oxalate,

disorders in which liver enzyme deficiency

often accompanies bowel disease or bariatric

results in endogenous oxalate overproduction

surgery

90 - 500 mg / 24 hrs (up to 10x normal)

45 - 130 mg / 24 hrs (up to 3x normal)

Pediatric

Adult

Limited nutrition options; nephrocalcinosis;

Limited nutrition options; treatment of kidney

dialysis; transplant; pyridoxine

stones as they occur; nephrocalcinosis; dialysis

~5,000 - 8,000

200,000 - 250,000

Number of Patients Affected

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 19

Enteric Hyperoxaluria Case Studies:

An Important Cause of Renal Failure

33-Year-Old Female with Crohn's

48-Year-Old Male with Crohn's

47-Year-Old Female with Crohn's

• 33 yo woman with Crohn's requiring

• 48 yo man with Crohn's requiring 2

• 47 yo woman with Crohn's requiring

bowel resection resulting in severe

bowel resections with severe

extensive bowel resections with severe

hyperoxaluria (135 mg/day)

hyperoxaluria (110 mg/day)

hyperoxaluria (114 mg/day)

• Clinical course punctuated by:

• Clinical course punctuated by:

• Clinical course punctuated by:

-

Recurrent kidney stones

-

Recurrent kidney stones

-

Recurrent kidney stones

-

Progressive renal failure

-

Nephrocalcinosis

-

Recurrent obstructive nephropathy

-

Hemodialysis

-

Progressive renal failure

-

Progressive renal failure

- Renal transplant x 1

-

Hemodialysis

-

Bilateral nephrectomies due to

-

Recurrent renal failure

-

Renal transplant

stone-related infections

-

Hemodialysis

-

Hemodialysis

- Renal transplant x 2

-

Renal transplant

-

Recurrent renal failure

Urinary oxalate levels remains markedly elevated in all patients, despite aggressive medical regimen

Nazzal et al. Nephrol Dial Transplant 2016

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 20

Enteric Hyperoxaluria Disease Pathogenesis

GI Based Therapies Have Demonstrated Lowering of Systemic Oxalate

Dietary Oxalate

Stomach

Small

Pathogenic hyperabsorption of dietary

oxalate

Oral

Dietary oxalate absorbed throughout GI

enzyme

tract

SYNB8802

Result is urinary oxalate (Uox) > 70mg/day

intestine

Colon

Leads to recurrent kidney stones,

nephrocalcinosis, kidney failure

Oxalo

Treatment must absorb oxalate

bacter

throughout GI tract, esp. in colon

Intestinal Degradation of Oxalate Throughout GI Tract Could Enhance Oxalate Lowering

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 21

SYN-HOX Attenuates Urinary Oxalate Increase

ASN Kidney Week 2020

SYN-HOX Consumes 13C-Oxalate in Mice

SYN-HOX Attenuates Urinary Oxalate Increase In NHPs

C-Oxalate

Creatinine)

13

of

Urine

(ug/mg

0.0008

0.0006

0.0004

*

0.0002

0.0000

Vh

SYNHOX

SYNHOX

SYNHOX

CFU

Live cell

Live cell

Frozen Liq.

Lyo

Oxalate

from vehicle)

Urine

change

(%

150

100

50

*

0

Vehicle 5e10 1e11 5e11 1e12

SYNHOX (CFU)

C-Oxalate

from vehicle)

13

change

Urine

(%

150

100

50 **

0 Vehicle 5e10 1e11 5e11 1e12

SYNHOX (CFU)

SYN-HOX Consumes Oral Load of Oxalate in Mouse and Non-Human Primate Models

* p< 0.05 , ** p< 0.01 versus vehicle

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 22

Enteric Hyperoxaluria: Phase 1 Design Provides PoC Opportunity

Phase 1a

Healthy Volunteers

Multiple Ascending Dose

  • High oxalate & low calcium diet run-in
  • Primary: Safety & tolerability
  • Secondary: Microbial kinetics of strain
  • Exploratory: Change in plasma and urine biomarkers

Phase 1b

Enteric Hyperoxaluria

Patients

Cross-over

  • TID dosing
  • N = 20 patients (Roux-en Y gastric bypass)
  • UOx >70 mg/day

Roux-en-Y Gastric Bypass Population Provides Opportunity to Demonstrate Urinary Oxalate Lowering in Disease State

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 23

Why Diseases of Immune System Regulation

For Synthetic Biotic Medicines?

Cross-talk Between Bacteria and Immune System

Immune system has evolved to recognize bacteria

Bacteria have evolved mechanisms to control the immune response

Unmet Medical Need

Growing need for novel treatments for immunological diseases and cancer

Platform

Preclinical POC for both immune stimulation and immunoregulation

Can produce immune mediators (small molecules, peptides, human cytokines)

Unique Advantage of SYNB

Targeted efficacy and improved safety

Multiple effectors from single Tx strain delivered to site of disease

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 24

Immunomodulation & Immuno-Oncology

Synthetic Biotics can be

SYNB1891 + checkpoint

SYNB1891 as monotherapy

Phase 1 data in

engineered for immune

inhibitors have potential

demonstrated target

combination with Tecentriq

activation or regulation,

for improved efficacy

engagement and

initiated: data will be

with application to

relative to other STING

meaningful

available in 2021

immuno-oncology

approaches

pharmacodynamic effects

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 25

SYNB1891 Induces Potent Anti-tumoral Effects

Effects Superior to 'Naked' STING Agonist in Animal Model of Cold Tumor

109 CFU, i.t. (SYNB or SYNB1891)

B16-F10 tumors

d1

d4

d7

d21

~100 mm3,

randomize groups

)

2500

3

EcN

(mm

2000

Volume

1500

= Dose

Tumor

1000

500

0

0

2

4

6

8

10

12

14

16

18

20

22

Study Day

SYNB1891 109 CFU, i.t. or 50 ug ADU-S100, i.t.

B16-F10 tumors

d1

d4

d7

d32

~100 mm3,

randomize groups

2000

Saline

3

SM STING agonist

)

(mm

1500

SYNB1891

= Dose

Volume

1000

Tumor

500

0

0

4

8

12

16

20

24

28

32

Days on Study

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 26

SYNB1891-CP-001 Study Design: Multidose Tolerability, IT Mono and Combo

Proof of mechanism: exploratory biomarkers in advanced solid tumors or lymphomas

Arm 1: Monotherapy Cohorts

Arm 2: Combination Cohorts - Atezolizumab

Sentinel Patient

Starting dose Arm 1

Sentinel Patient

Day 7 safety Eval

is Cohort 3 dose

Day 7 safety Eval

(1e7)

Patient 2 & 3

Patient 2 & 3

Safety

Repeat for

Arm 1

Safety

Cohort 4

Evaluation

each cohort

Evaluation

POM/Exploratory Biomarkers

PD response (tumor biopsy):

  • TILs, IFN b, IFN dependent gene expression (Nanostring)
  • Immunohistochemistry
  • Kinetics of SYNB1891 (qPCR)

Systemic PD effects (blood):

  • Serum cytokines levels
  • Kinetics of SYNB1891 (qPCR)

Repeat for

Recommended

Enroll <20

Ph2 Dose

patients at

each cohort

(RP2D)

RP2D

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 27

SYNB1891 Advanced Into Combo. Therapy Arm of Ph. 1 With Tecentriq

SYNB1891 is safe and well-tolerated as an intratumoral injection with no dose limiting toxicities or infections to date

SYNB1891 demonstrates target engagement as assessed by upregulation of IFN-stimulated genes and T-cells

SYNB1891 demonstrates meaningful pharmacodynamic effects including systemic cytokine responses observed in two subjects

Evidence of durable stable disease was observed in two patients

Monotherapy dose escalation will continue in parallel to combination dose escalation of SYNB1891 with fixed dose of Atezolizumab (Tecentriq)

Combination therapy data will be available in H2 2021

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 28

3rd Quarter 2020 Summary Results

Balance Sheet (unaudited)

30 Sept 2020

30 June 2020

Cash, Cash Equivalents, and Short & Long Term Marketable Securities

$102.0 M

$109.1M

Three Months Ended

Statement of Operations (unaudited)

30 Sept 2020

30 Sept 2019

R&D Expenses

$10.5 M

$10.6 M

G&A Expenses

$3.0 M

$3.9 M

Net Loss

$(13.2 M)

$(13.3M)

Net loss per share - basic and diluted*

$(0.36)

$(0.39)

Weighted Average Shares Outstanding*

36.3 M

34.2 M

Strong Cash Position with Runway into 2022

* weighted average shares used in computing net loss per shares - basic and diluted

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 29

Aoife Brennan, MB ChB President & CEO

Gregg Beloff, JD

Interim CFO

Dave Hava, PhD

CSO

Caroline Kurtz, PhD

Head of Product

Development

Synlogic Leadership

Richard Riese, MD PhD

CMO

Antoine Awad

COO

Daniel Rosan

Head of Corp. Finance &

Investor Relations

Board

Peter Barrett, Chair

Ed Mathers

Atlas Venture

NEA

Mike Burgess

Richard Shea

Turnstone Biologics

Syndax

Chau Khuong

Michael Heffernan

Orbimed Advisors

Collegium

Nick Leschly

Patricia Hurter

Bluebird Bio

Lyndra Therapeutics

Collaborators

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 30

Appendix:

Engineering

Synthetic Biotic

Medicines

© 2020 SYNLOGIC. ALL RIGHTS RESERVED. | 31

Synthetic Biotic Medicines: A New Class of Cellular Medicines

Cellular

Programmable

Synthetic Biotic

Medicine

Bacterial Chassis

Synthetic Biology

Non-pathogenic

Reusable Parts

Bacterial Chassis

Inducer-Promoter Switch

Inducer

Toxin

Biomarker

Promoter

Effector

Metabolic

Biomarker

Effector Design

Conversions

Safety Features

Reusable Parts Enable Rapid Iteration of Rationally Designed Prototypes

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 32

Photo credit: NIH Image Gallery

Library of Parts to Generate Prototypes

Synthetic Biology Library Rapidly Generates Drug Candidates

Component

Bacterial Chassis

Effector 1

Effector 2

….

Switch

Safety Features

Benefit

Probiotic: Decades of human

use & safety data

Proteins for activity: Can

generate biomarkers

Inducer-promoter pair: Controls gene expression

Auxotrophies: Prevents growth within or external to the body

Toxin

Inducer

Biomarker 1

Effector 1

P

PheP:

Biomarker 1

High-

Affinit

Metabolic

y

Uptak

Effector 2

P

e

Biomarker 2

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 33

SYNB1618 Design

Built from Synthetic Library Specifically to Consume Phe

Component Approach

Bacterial Chassis

E. coli Nissle

Switches

FNR & AraC

promoter

PumpPheP

Effector 1

PAL3 Enzyme

Effector 2

LAAD Enzyme

Safety Features

dap

Benefit

Probiotic - decades of human

use & safety data

Promoters control expression during manufacturing and at site of action

Pumps Phe into cell

Degrades Phe to TCA

(measurable biomarker of

activity)

Alt. Phe-consuming pathway

Auxotrophy - requires

diaminopimelic acid (DAP) to

grow

Hippuric Acid (HA)

Phenylalanine (Phe)

02

(TCA)

PAL3

Pfnr

PheP:

Phe

Trans-cinnamic

dap

High-

acid (TCA)

Affinity

Uptake

Metabolic Conversions

LAAD ParaC

Phe

Phenylpyruvate (PP)

Phenyl-lactic acid

(PLA)

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 34

SYNB8802 Design

Engineered to Convert Oxalate to Formate for the Treatment of Enteric Hyperoxaluria

Component Approach

Bacterial Chassis

E. coli Nissle

Switch

FNR promoter

Pump

OxLT

OxdC and

Effector 1

associated

components

Benefit

Decades of human use

Inducer-promoter pair

Pumps oxalate in & formate

out

Catalyzes conversion of

oxalate to formate

Oxalate

D

D DDFormate

Ox/formate

D

D DD

02

Pump (OxLT)

D D

D

D

Oxalate

Formate

thyA

DATPCoA+

:

FRC

Affinity

Ppi +

Uptake

Formyl CoA

Oxalyl CoA

AMP

Metabolic

OxdC

Safety Features

thyA

Controls growth

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 35

SYNB1891 Design

Leveraging the Ability of Bacteria to Interact with the Immune System to Turn a Cold Tumor Hot

Component

Bacterial Chassis

Switch

Effector:

STING Agonist

Safety Features

Benefit

Targeting to antigen presenting cells in

the tumor microenvironment.

Innate immune activation

STING-agonist production restricted to hypoxic TME for sustained payload delivery

Innate immune activator compounds

with chassis effect

Dual auxotrophies inhibit bacterial

proliferation outside of tumor

02

dacA

Pfnr

thyA

dapA

ATP +

Cyclic-di-AMP

ATP

(STING Agonist)

© 2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 36

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TEL: 617-401-9975

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2021 SYNLOGIC. CORPORATE PRESENTATION. ALL RIGHTS RESERVED. | 37

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Synlogic Inc. published this content on 22 January 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 22 January 2021 18:01:08 UTC