UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

_____________

FORM 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities and Exchange Act of 1934

For April 11, 2019

Commission file number: 1-13.396

Transportadora de Gas del Sur S.A.

Don Bosco 3672, Fifth Floor

1206 Capital Federal

Argentina

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F  X  Form 40-F   

Indicate by check mark if registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): __

Indicate by check mark if registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): __

Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to the Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes   No X  

If "Yes" is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):

City of Buenos Aires, April 11, 2019.

Messrs.

Comisión Nacional de Valores (Argentine Securities and Exchange Commission)

Bolsas y Mercados Argentinos S.A. (Argentine Stock Exchanges and Markets)

Bolsa de Comercio de Buenos Aires (Buenos Aires Stock Exchange)

Gerencia Técnica y de Valores Negociables (Technical and Negotiable Securities Management)

Re: Material Fact. Regular Transactions with Related Parties. Section 72 Act no. 26,831.

Dear Sirs,

I am writing to you in my capacity as Head of Market Relations of Transportadora de Gas del Sur S.A. (“TGS” or the “Company”), in order to report that in its meeting held today, the Board of Directors approved an amendment to the “Master policy for the purchase of natural gas” (the “Master Policy”) and the “Policy for SPOT purchases of natural gas with related parties”, the latter will be effective until December 31, 2019 (the “Policy”).

Prior to approval of the Master Policy and the Policy, TGS Audit Committee was asked to issue a report in compliance with sections 72 and 110 subparagraph h) of Capital Markets Act no. 26,831 and section 18 subparagraph f), Section V, Chapter III, Title II of the Rules of the Argentine Securities and Exchange Commission (Comisión Nacional de Valores).

On April 11, 2019, after reviewing and analyzing the Master Policy and the Policy, the Audit Committee concluded that the transactions with related parties carried out pursuant to and under the terms of the Policy can reasonably be deemed to be entered into on an arm’s length basis.

The Audit Committee’s report is available for consultation by accredited shareholders if so desired, at TGS’ principal office located at Don Bosco 3672 5^th floor, City of Buenos Aires (Legal Department).

Yours sincerely,

Hernán Diego Flores Gómez

Head of Market Relations

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Transportadora de Gas del Sur S.A.

By:	/s/Alejandro M. Basso
		Name:	Alejandro M. Basso
		Title:	Vice President of Administration, Finance and Services

By:	/s/Hernán D. Flores Gómez
	Name:	Hernán Diego Flores Gómez
	Title:	Legal Affairs Vice President

Date: April 11, 2019.