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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. __)*

                           ALTUS PHARMACEUTICALS, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                                  COMMON STOCK
--------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    02216N105
--------------------------------------------------------------------------------
                                 (CUSIP Number)


                                DECEMBER 20, 2007
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

|_|   Rule 13d-1(b)

|X|   Rule 13d-1(c)

|_|   Rule 13d-1(d)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


PERSONS WHO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED IN THIS FORM ARE
NOT REQUIRED TO RESPOND UNLESS  THE FORM DISPLAYS A CURRENTLY VALID OMB CONTROL
NUMBER.



                                       1




---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 2 of 9 Pages
---------------------                                       -------------------

    1.      NAMES OF REPORTING PERSONS

            Great Point Partners, LLC

            I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):

            37-1475292

    2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
            (a)    |_|

            (b)    |_|


    3.      SEC USE ONLY

    4.      CITIZENSHIP OR PLACE OF ORGANIZATION

            USA

      NUMBER OF SHARES          5.    SOLE VOTING POWER
                                                                     0
       BENEFICIALLY
                                6.    SHARED VOTING POWER
      OWNED BY EACH
                                                                 1,868,195
    REPORTING PERSON            7.    SOLE DISPOSITIVE POWER
                                                                     0
           WITH
                                8.    SHARED DISPOSITIVE POWER

                                                                 1,868,195

    9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                     1,868,195

   10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           (See Instructions)
                                                                            |_|

   11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                     6.08%

   12.     TYPE OF REPORTING PERSON (See Instructions)

                     OO





---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 3 of 9 Pages
---------------------                                       -------------------

    1.      NAMES OF REPORTING PERSONS

            Dr. Jeffrey R. Jay, M.D.

            I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):


    2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
            (a)    |_|

            (b)    |_|


    3.      SEC USE ONLY

    4.      CITIZENSHIP OR PLACE OF ORGANIZATION

            USA

      NUMBER OF SHARES          5.    SOLE VOTING POWER
                                                                     0
       BENEFICIALLY
                                6.    SHARED VOTING POWER
      OWNED BY EACH
                                                                 1,868,195
    REPORTING PERSON            7.    SOLE DISPOSITIVE POWER
                                                                     0
           WITH
                                8.    SHARED DISPOSITIVE POWER

                                                                 1,868,195

    9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                     1,868,195

   10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
           (See Instructions)                                            |_|


   11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                     6.08%

   12.     TYPE OF REPORTING PERSON (See Instructions)

                     IN




---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 4 of 9 Pages
---------------------                                       -------------------

    1.      NAMES OF REPORTING PERSONS

            Mr. David Kroin

            I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY):


    2.      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
            (a)    |_|

            (b)    |_|


    3.      SEC USE ONLY

    4.      CITIZENSHIP OR PLACE OF ORGANIZATION

            USA

      NUMBER OF SHARES          5.    SOLE VOTING POWER
                                                                     0
       BENEFICIALLY
                                6.    SHARED VOTING POWER
      OWNED BY EACH
                                                                 1,868,195
    REPORTING PERSON            7.    SOLE DISPOSITIVE POWER
                                                                     0
           WITH
                                8.    SHARED DISPOSITIVE POWER

                                                                 1,868,195

    9.     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                     1,868,195

   10.     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
          (See Instructions)                                             |_|


   11.     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                     6.08%

   12.     TYPE OF REPORTING PERSON (See Instructions)

                     IN




---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 5 of 9 Pages
---------------------                                       -------------------

ITEM 1.

              (a)     Name of Issuer

                      Altus Pharmaceuticals Inc.

              (b)     Address of Issuer's Principal Executive Offices

                      125 Sidney Street, Cambridge, MA  02139

ITEM 2.

              (a)     Name of Person Filing

                                Great Point Partners, LLC
                                Dr. Jeffrey R. Jay, M.D.
                                Mr. David Kroin

              The Reporting Persons have entered into a Joint Filing Agreement,
              dated December 31, 2007, a copy of which is filed with this
              Schedule 13G as Exhibit A, pursuant to which the Reporting Persons
              have agreed to file this statement jointly in accordance with the
              provisions of Rule 13d-1(k)(1) under the Act.

              (b)     Address of Principal Business Office, or if none,
                      Residence

                      The address of the principal business office of each of
                      the Reporting Persons is

                                165 Mason Street, 3rd Floor
                                Greenwich, CT 06830

              (c)     Citizenship

              Great Point Partners, LLC is a limited liability company organized
              under the laws of the State of Delaware. Dr. Jeffrey R. Jay, M.D.
              is a citizen of the United States. Mr. David Kroin is a citizen of
              the United States.

              (d)     Title of Class of Securities

                      Common Stock

              (e)     CUSIP Number

                      02216N105

ITEM 3.       IF THIS STATEMENT IS FILED PURSUANT TO SS.240.13D-1(B) OR
              240.13D.2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:

                      Not Applicable.

              (a) |_| Broker or dealer registered under Section 15 of the Act
                      (15 U.S.C. 78o)

              (b) |_| Bank as defined in Section 3(a)(6) of the Act (15 U.S.C.
                      78c).

              (c) |_| Insurance company as defined in Section 3(a)(19) of the
                      Act (15. U.S.C. 78c).

              (d) |_| Investment Company registered under Section 8 of the
                      Investment Company Act of 1940 (15 U.S.C. 80a-8).

              (e) |_| An investment adviser in accordance with
                      ss.240.13d-1(b)(1)(ii)(E).




---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 6 of 9 Pages
---------------------                                       -------------------

              (f) |_| An employee benefit plan or endowment fund in accordance
                      with ss.240.13d-1(b)(1)(ii)(F).

              (g) |_| A parent holding company or control person in accordance
                      with ss.240.13d-1(b)(1)(ii)(G).

              (h) |_| A savings associations as defined in Section 3(b) of the
                      Federal Deposit Insurance Act (12 U.S.C. 1813).

              (i) |_| A church plan that is excluded from the definition of an
                      investment company under Section 3(c)(14) of the
                      Investment Company Act of 1940 (15 U.S.C. 80a-3).

              (j) |_| Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).


ITEM 4.       OWNERSHIP

              Great Point Partners, LLC ("Great Point") is the investment
              manager of Biomedical Value Fund, L.P. ("BVF"), and by virtue of
              such status may be deemed to be the beneficial owner of the
              1,008,828 shares of Common Stock of the Issuer owned by BVF (the
              "BVF Shares"). Each of Dr. Jeffrey R. Jay, M.D. ("Dr. Jay"), as
              senior managing member of Great Point, and Mr. David Kroin ("Mr.
              Kroin"), as special managing member of Great Point, has voting and
              investment power with respect to the BVF Shares, and therefore may
              be deemed to be the beneficial owner of the BVF Shares.

              Great Point is the investment manager of Biomedical Offshore Value
              Fund, Ltd. ("BOVF"), and by virtue of such status may be deemed to
              be the beneficial owner of the 859,367 shares of Common Stock of
              the Issuer owned by BOVF (the "BOVF Shares"). Dr. Jay, as senior
              managing member of Great Point, and Mr. Kroin, as special managing
              member of Great Point, has voting and investment power with
              respect to the BOVF Shares, and therefore may be deemed to be the
              beneficial owner of the BOVF Shares.

              Each of Great Point, Dr. Jay and Mr. Kroin disclaim beneficial
              ownership of the BVF Shares and the BOVF Shares, except to the
              extent of their respective pecuniary interest.

              Provide the following information regarding the aggregate number
              and percentage of the class of securities of the issuer identified
              in Item 1.

              1.      GREAT POINT PARTNERS, LLC

              (a)     Amount beneficially owned: 1,868,195

              (b)     Percent of class: 6.08%

              (c)     Number of shares as to which the person has:

                      (i)    Sole power to vote or to direct the vote: - 0 -

                      (ii)   Shared power to vote or to direct the vote:
                             1,868,195

                      (iii)  Sole power to dispose or to direct the disposition
                             of: - 0 -.

                      (iv)   Shared power to dispose or to direct the
                             disposition of: 1,868,195

              2.      DR. JEFFREY R. JAY, M.D.

              (a)     Amount beneficially owned: 1,868,195

              (b)     Percent of class: 6.08%





---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 7 of 9 Pages
---------------------                                       -------------------




              (c)     Number of shares as to which the person has:

                      (i)    Sole power to vote or to direct the vote: 0.

                      (ii)   Shared power to vote or to direct the vote:
                             1,868,195

                      (iii)  Sole power to dispose or to direct the disposition
                             of: 0.

                      (iv)   Shared power to dispose or to direct the
                             disposition of: 1,868,195

              3.      MR. DAVID KROIN

              (a)     Amount beneficially owned: 1,868,195

              (b)     Percent of class: 6.08%

              (c)     Number of shares as to which the person has:

                      (i)    Sole power to vote or to direct the vote: 0.

                      (ii)   Shared power to vote or to direct the vote:
                             1,868,195

                      (iii)  Sole power to dispose or to direct the disposition
                             of: 0.

                      (iv)   Shared power to dispose or to direct the
                             disposition of: 1,868,195


ITEM 5.       OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

              Not Applicable.

ITEM 6.       OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

              See Item 4.

ITEM 7.       IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
              THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

              Not Applicable.

ITEM 8.       IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

              Not Applicable.

ITEM 9.       NOTICE OF DISSOLUTION OF GROUP

              Not Applicable.

ITEM 10.      CERTIFICATION

By signing below I certify that, to the best of my knowledge and belief, the
securities referred to above were not acquired and are not held for the purpose
of or with the effect of changing or influencing the control of the issuer of
the securities and were not acquired and are not held in connection with or as
participant in any transaction having that purpose or effect.





---------------------                                       -------------------
 CUSIP No. 02216N105                      13G                Page 8 of 9 Pages
---------------------                                       -------------------

                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

Date: December 31, 2007

                            GREAT POINT PARTNERS, LLC

                            By: /s/ DR. JEFFREY R. JAY, M.D.
                                ----------------------------------------
                                Dr. Jeffrey R. Jay, M.D.,
                                  as senior managing member

                            /s/ DR. JEFFREY R. JAY, M.D.
                            ---------------------------------------------
                            DR. JEFFREY R. JAY, M.D.

                            /s/ MR. DAVID KROIN
                            ---------------------------------------------
                            MR. DAVID KROIN









                                                                      EXHIBIT A


              AGREEMENT REGARDING THE JOINT FILING OF SCHEDULE 13G

The undersigned hereby agree as follows:

         (i) Each of them is individually eligible to use the Schedule 13G to
which this Exhibit is attached, and such Schedule 13G is filed on behalf of each
of them; and

         (ii) Each of them is responsible for the timely filing of such Schedule
13G and any amendments thereto, and for the completeness and accuracy of the
information concerning such person contained therein; but none of them is
responsible for the completeness or accuracy of the information concerning the
other persons making the filing, unless such person knows or has reason to
believe that such information is inaccurate.

Date: December 31, 2007

                            GREAT POINT PARTNERS, LLC

                            By: /s/ DR. JEFFREY R. JAY, M.D.
                                ----------------------------------------
                                Dr. Jeffrey R. Jay, M.D.,
                                  as senior managing member


                            /s/ DR. JEFFREY R. JAY, M.D.
                            ---------------------------------------------
                            DR. JEFFREY R. JAY, M.D.

                            /s/ MR. DAVID KROIN
                            ---------------------------------------------
                            MR. DAVID KROIN