<SEC-DOCUMENT>0001209191-16-145801.txt : 20161013
<SEC-HEADER>0001209191-16-145801.hdr.sgml : 20161013
<ACCEPTANCE-DATETIME>20161013162733
ACCESSION NUMBER:		0001209191-16-145801
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20161011
FILED AS OF DATE:		20161013
DATE AS OF CHANGE:		20161013

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Protagonist Therapeutics, Inc
		CENTRAL INDEX KEY:			0001377121
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		521 COTTONWOOD DRIVE, SUITE 100
		CITY:			MALPITAS
		STATE:			CA
		ZIP:			95035-7404
		BUSINESS PHONE:		408-649-7370

	MAIL ADDRESS:	
		STREET 1:		521 COTTONWOOD DRIVE, SUITE 100
		CITY:			MALPITAS
		STATE:			CA
		ZIP:			95035-7404

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Protagonist Therapeutics Inc
		DATE OF NAME CHANGE:	20130605

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Protagonist Inc
		DATE OF NAME CHANGE:	20061002

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			O'Neil Thomas P.
		CENTRAL INDEX KEY:			0001640645

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37852
		FILM NUMBER:		161935212

	MAIL ADDRESS:	
		STREET 1:		ARCADIA BIOSCIENCES, INC.
		STREET 2:		202 COUSTEAU PLACE, SUITE 105
		CITY:			DAVIS
		STATE:			CA
		ZIP:			95618
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc4.xml
<DESCRIPTION>FORM 4 SUBMISSION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-10-11</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001377121</issuerCik>
        <issuerName>Protagonist Therapeutics, Inc</issuerName>
        <issuerTradingSymbol>PTGX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001640645</rptOwnerCik>
            <rptOwnerName>O'Neil Thomas P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PROTAGONIST THERAPEUTICS, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>521 COTTONWOOD DRIVE, SUITE 100</rptOwnerStreet2>
            <rptOwnerCity>MILPITAS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95035</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Financial Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (right to buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>21.58</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2016-10-11</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>45000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <value>2026-10-11</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>45000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>45000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares subject to the option shall vest in 48 equal monthly installments from the vesting commencement date of August 10, 2016.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Thomas P. O'Neil</signatureName>
        <signatureDate>2016-10-12</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
